Co-reporter:Yue Lou, Wenjie Zhao, Chunguang Li, He Huang, Tianyu Bai, Cailing Chen, Chen Liang, Zhan Shi, Dong Zhang, Xiao-Bo Chen, and Shouhua Feng
ACS Applied Materials & Interfaces May 31, 2017 Volume 9(Issue 21) pp:18046-18046
Publication Date(Web):May 17, 2017
DOI:10.1021/acsami.7b03117
In this research, we reported the synthesis of quaternary Cu3InSnSe5 nanoparticles with uniform size distribution and morphology for the first time through delicate controls over the chemical reaction kinetics. On the basis of the preparation strategy of Cu3InSnSe5 nanoparticles, Pt–Cu3InSnSe5 and Au–Cu3InSnSe5 heteronanostructures were designed and yielded using a simple and efficient seed growth method. These two heteronanostructures remained monodispersed without presence of any Cu3InSnSe5 nanocrystal impurities. To explore their application potentials for dye-sensitized solar cells, counter electrodes consisting of individual Cu3InSnSe5, Pt–Cu3InSnSe5, or Au–Cu3InSnSe5 constituents were fabricated. Current density–voltage (J–V) characteristics evaluation reveals that Cu3InSnSe5 nanoparticles, Pt–Cu3InSnSe5 and Au–Cu3InSnSe5 heterostructured nanoparticles display a comparative power conversion efficiency (PCE) of 5.8%, 7.6%, and 6.5% to that of a Pt-based counter electrode (7.9%), respectively. As such, we believe that the reported preparation strategy could provide new insights to the design and manufacture of counter electrode materials with controlled structure, morphology, and optimized power conversion efficiency for dye-sensitized solar cells.Keywords: counter electrodes; Cu3InSnSe5 nanoparticles; dye-sensitized solar cells; metal−semiconductor heterostructures; photovoltaic performance;
Co-reporter:Cailing Chen, Jianhua Liu, Ying Chen, Chunguang Li, Xiaomin Liu, He Huang, Chen Liang, Yue Lou, Zhan ShiShouhua Feng
ACS Applied Materials & Interfaces 2017 Volume 9(Issue 7) pp:
Publication Date(Web):February 7, 2017
DOI:10.1021/acsami.6b14007
Herein, sub-10 nm core–shell nanocrystals (NCs), which select Sr2LuF7:Yb/Er as core, Sr2GdF7 as middle shell, and SrF2 as an outermost shell, were synthesized by a seed-mediated growth process. The NCs possess good crystallinity, morphology, and up-conversion luminescent properties. After modification by polyethylenimine branched (PEI), in vitro cell up-conversion imaging with low autofluorescence was realized. Due to the presence of Gd3+ ions, in vivo magnetic resonance (MR) imaging was also achieved with these designed NCs. More significantly, these special core–shell NCs exhibited high contrast in in vivo X-ray computed tomography (CT) imaging because of their good X-ray absorption ability. These results indicate that the core–shell up-conversion NCs can serve as promising contrast agents for up-conversion luminescence–MR–CT trimodal bioimaging.Keywords: core−shell; muti-modal bioimaging; nanocrystal; rare earth; up-conversion;
Co-reporter:Chen Liang, Jinpeng Bao, Chunguang Li, He Huang, Cailing Chen, Yue Lou, Haiyan Lu, Haibo Lin, Zhan Shi, Shouhua Feng
Microporous and Mesoporous Materials 2017 Volume 251(Volume 251) pp:
Publication Date(Web):1 October 2017
DOI:10.1016/j.micromeso.2017.05.044
•Biomass-derived one-dimensional hierarchical pore carbon (1-DHPC) was synthesized.•The specific structure is conducive to the diffusion of the charges.•Good capacitance of 256.5 F g−1 and low equivalent series resistance of 0.16 Ω was obtained.One-dimensional hierarchically porous carbon was prepared by carbonized and activated plant metaplexis and exhibited large surface area and high performance as supercapacitor electrode materials. Scanning electron microscope, transmission electrode microscope, X-ray spectroscopy, X-ray photoelectron spectroscopy, and Raman were used to characterize the microtopography and chemical composition of the materials as well as their transformation during the preparation process. With specific surface area (1394m2 g−1) and fine electrochemistry performance, the product exhibited a capacitance of 256.5 F g−1 at 5 mV s−1 and a very low equivalent series resistance of 0.16 Ω. The fine supercapacitor performance could be attributed to the hierarchically porous, large surface area and the specific ultralong tubular structure.Download high-res image (300KB)Download full-size image
Co-reporter:Yue Lou, Chunguang Li, Xuedong Gao, Tianyu Bai, Cailing Chen, He Huang, Chen Liang, Zhan Shi, and Shouhua Feng
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 25) pp:16147-16153
Publication Date(Web):June 16, 2016
DOI:10.1021/acsami.6b05350
In this report, a facile and general strategy was developed to synthesize original bamboo-shaped Te nanotubes (NTs) with well-controlled size and morphology. On the basis of the as-prepared Te NTs, porous Pt nanotubes (NTs) with excellent property and structural stability have been designed and manufactured. Importantly, we avoided the use of surface stabilizing agents, which may affect the catalytic properties during the templated synthesis process. Furthermore, Pt NTs with different morphology were successfully prepared by tuning the experimental parameters. As a result, transmission electron microscopy (TEM) study shows that both Te NTs and Pt NTs have uniform size and morphology. Following cyclic voltammogram (CV) testing, the as-prepared porous Pt NTs and macroporous Pt NTs exhibited excellent catalytic activities toward electrochemical methanol oxidation reactions due to their tubiform structure with nanoporous framework. Thus, the as-prepared Pt NTs with specific porous structure hold potential usage as alternative anode catalysts for direct methanol fuel cells (DMFCs).
Co-reporter:Dingxuan Ma, Baiyan Li, Kang Liu, Xianlong Zhang, Weijian Zou, Yongquan Yang, Guanghua Li, Zhan Shi and Shouhua Feng
Journal of Materials Chemistry A 2015 vol. 3(Issue 46) pp:23136-23142
Publication Date(Web):06 Oct 2015
DOI:10.1039/C5TA07026K
We reported herein a strategy for combining CUS-based MOF (CUS = coordinatively unsaturated metal sites) with ionic liquid (IL) functional sites to form bifunctional heterogeneous catalysts with extra high activity for CO2 fixation. Based on this strategy, two quaternary ammonium salt and quaternary phosphorus salt ionic liquid functionalized CUS-containing MOF heterogeneous catalysts, MIL-101-N(n-Bu)3Br and MIL-101-P(n-Bu)3Br, have been prepared for the first time by a post-synthesis modification method. Due to the synergetic role of dual functional sites including Lewis acid sites in the MOF framwork and Br− ions in the IL functional sites, MIL-101-N(n-Bu)3Br and MIL-101-P(n-Bu)3Br exhibit high catalytic activity for the cycloaddition of CO2 and epoxide under mild and co-catalyst free conditions, which significantly outperforms other benchmark MOF catalysts. Moreover, such bifunctional catalysts can be easily recovered and recycled several times without leaching and loss of activity. Our work thus paves a way for the development of IL functionalized MOFs as heterogeneous catalysts for CO2 fixation.
Co-reporter:Kang Liu, Benhua Ma, Xiaolei Guo, Dingxuan Ma, Lingkun Meng, Guang Zeng, Fen Yang, Guanghua Li, Zhan Shi and Shouhua Feng
CrystEngComm 2015 vol. 17(Issue 27) pp:5054-5065
Publication Date(Web):01 Jun 2015
DOI:10.1039/C5CE00807G
Reactions of divalent transition metal ions with the N,N′-sulfuryldiimidazole ligand (sdi) gave rise to eleven coordination polymers, namely, [Zn(sdi)(NO3)2(H2O)] (1), [Zn(sdi)2(NO3)2] (2), [Co(sdi)2(NO3)2] (3), [Cu(sdi)2(NO3)2]·2CO(CH3)2 (4), [Mn(sdi)2(H2O)2]·2NO3 (5), [Co(sdi)2(H2O)2]·2ClO4 (6), [Zn(sdi)(bdc)0.5(OCH3)(H2O)]·ClO4·H2O (7), [Cd(sdi)(N3)2] (8), [Mn(sdi)(N3)2] (9), [Ni(sdi)2(SO4)] (10) and [Cd(sdi)0.5(Hbtc)(OCH3)] (11) (H2bdc = 1,4-benzenedicarboxylic acid, H3btc = 1,3,5-benzenetricarboxylic acid). X-ray single-crystal analyses reveal that they have rich structural chemistry ranging from zero-dimensional (0D) (1), one-dimensional (1D) (2–7), two-dimensional (2D) (8) to three-dimensional (3D) (9–11) networks. Compound 1 displays a 0D structure which consists of [Zn(sdi)]2 dimers. Compounds 2–7 possess 1D chains with closed loops. Compound 8 shows a 2D (63) network. Compounds 9 and 10 exhibit 3D uninodal 6-connected pcu frameworks with (412·63) topology. Compound 11 displays a 3D uninodal 4-connected framework with a CdSO4-like net (65·8). The effects of metal ions and anions on the final motifs of the compounds have been discussed in detail. All the compounds are characterized using powder X-ray diffraction (PXRD), IR spectroscopy, thermal stability analysis and elemental analyses. Moreover, the photoluminescence properties of 1, 2, 7, 8 and 11 have been investigated. Magnetic investigation of 9 reveals spin canting antiferromagnetic interactions.
Co-reporter:Yu Peng, Guanghua Li, Jia Hua, Zhan Shi and Shouhua Feng
CrystEngComm 2015 vol. 17(Issue 16) pp:3162-3170
Publication Date(Web):18 Mar 2015
DOI:10.1039/C5CE00078E
Six new metal–organic frameworks (MOFs), Co2O(odip)(py)2(DMSO)2·3H2O (1), Co2(odip)(H2O)(DMA)2·2DMA (2), Co4(odip)2(H2O)4(DMSO)2·5DMSO (3), [Zn2(odip)(DMF)2(H2O)]·2DMF·2H2O (4), Zn2(odip)(H2O) (5) and In(odip)·3ACN (6), have been synthesized from the 5,5′-oxydiisophthalic acid (H4odip) ligand under solvothermal conditions. These six compounds were characterized by single-crystal X-ray diffraction, power X-ray diffraction and relative physical methods. MOFs 1, 2 and 3 are constructed from the same ligand and metal-salt under the same temperature, but with different solvents, and they exhibit three different topologies. MOF 1 possesses a 3D 4-coordinated architecture with a (65·8) topology. MOF 2 features a 3D 4-coordinated net with a (42·63·8) topology and MOF 3 shows a 3D 4-coordinated framework with a (4·64·8)(4·65) topology. MOFs 4 and 6 have the same topology as MOF 2. MOF 5 exhibits a 3D 5-coordinated framework with a (44·66) topology. These results indicate that the solvent environment plays an important role in the formation of the final framework. Moreover, the photoluminescence properties of 4 and 5, and the magnetic properties of 1, 2 and 3 have been studied and discussed.
Co-reporter:Cailing Chen;Chunguang Li;Tao Li;Jianhua Liu;He Huang;Tianyu Bai;Zhaorui Wang;Shouhua Feng
European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 19) pp:3108-3115
Publication Date(Web):
DOI:10.1002/ejic.201500212
Abstract
Monodisperse and water-soluble lanthanide (Ln3+)-doped Y(Gd)VO4 nanocrystals (NCs) have been successfully synthesized by a fast, facile, and environmentally friendly microwave-assisted route with poly(acrylic acid) as the surfactant. The Y(Gd)VO4:5 %Ln3+ (Ln = Eu, Dy, Sm) NCs have unique fluorescence properties and polydimethylsiloxane (PDMS)-based white solid nanocomposites containing YVO4:5 %Eu3+ NCs show red emission upon UV irradiation. GdVO4 NCs can act as CT and MRI contrast agents as a result of their magnetic and X-ray absorption properties. A layer of SiO2 was coated onto the surfaces of the nanoparticles and MTT assays were carried out to test the cytotoxicity of the YVO4@SiO2 and GdVO4 NCs. The results indicate that the Y(Gd)VO4 NCs have potential in multimodal optical/MRI/CT bio-imaging.
Co-reporter:Tianyu Bai;Shanghua Xing;Yue Lou;Cailing Chen;He Huang; Chunguang Li; Zhan Shi;Shouhua Feng
ChemPlusChem 2015 Volume 80( Issue 4) pp:652-655
Publication Date(Web):
DOI:10.1002/cplu.201402431
Abstract
Novel wurtzite Cu3AlSnS5 nanocrystals with uniform size and shape are synthesized for the first time using a facile colloidal synthetic approach. The nanocrystals are characterized in detail and have a band gap of 1.35 eV. The photoresponsive behavior indicates their potential application in solar energy conversion devices.
Co-reporter:Kang Liu, Dingxuan Ma, Baiyan Li, Yi Li, Kexin Yao, Zhijuan Zhang, Yu Han and Zhan Shi
Journal of Materials Chemistry A 2014 vol. 2(Issue 38) pp:15823-15828
Publication Date(Web):08 Aug 2014
DOI:10.1039/C4TA03656E
We report on the storage capacity and separation selectivity of an rht-type metal–organic framework, Cu–TDPAT [TDPAT = 2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazine], for C2 hydrocarbons over CH4. Henry's constant, the isosteric heat of adsorption and the ideal adsorbed solution theory selectivity were calculated based on single-component sorption isotherms. Theoretical calculations indicate that both the open metal sites and the Lewis basic sites have strong interactions with the C2 molecules. The combination of these two kinds of sites lead to the highest C2H2–CH4 selectivity of 127.1 as well as record high values for C2H4 adsorption enthalpies. To mimic real-world conditions, breakthrough experiments were conducted on an equimolar four-component mixture containing C2H2, C2H4, C2H6 and CH4 at room temperature and 1 atm pressure. Our results show that Cu–TDPAT is a promising candidate for CH4 capture and purification.
Co-reporter:Kang Liu, Baiyan Li, Yi Li, Xu Li, Fen Yang, Guang Zeng, Yu Peng, Zhijuan Zhang, Guanghua Li, Zhan Shi, Shouhua Feng and Datong Song
Chemical Communications 2014 vol. 50(Issue 39) pp:5031-5033
Publication Date(Web):25 Mar 2014
DOI:10.1039/C4CC00375F
We report the storage capacities and separation selectivity of an rht-type s-heptazine-based metal organic framework (MOF), [Cu3(TDPAH)(H2O)3]·13H2O·8DMA, 1, (where TDPAH is 2,5,8-tris(3,5-dicarboxylphenylamino)-s-heptazine and DMA is N,N-dimethylacetamide) for C2 hydrocarbons and CO2 over CH4. MOF 1 displays the highest C2H2/CH4 selectivity of 80.9 as well as record high C2H4 and C2H6 adsorption enthalpies. Theoretical calculations reveal that s-heptazine and NH groups within the framework have synergistic effects on CO2 binding.
Co-reporter:Kang Liu, Yu Peng, Fen Yang, Dingxuan Ma, Guanghua Li, Zhan Shi and Shouhua Feng
CrystEngComm 2014 vol. 16(Issue 21) pp:4382-4389
Publication Date(Web):03 Feb 2014
DOI:10.1039/C4CE00105B
The designed organic ligand 5-(3-amino-tetrazole-5-phenoxy)-isophthalic acid (H2atpia) has been successfully prepared and its coordination features have been explored. By the reaction of H2atpia with transition metals, three metal–organic frameworks (MOFs), namely [Cd(atpia)]2 (1), [Cu3O2(atpia)2] (2) and [Mn3(OH)2(atpia)3]·1.25H2O (3) have been synthesized under hydrothermal conditions. All the compounds were fully characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, power X-ray diffraction and single-crystal X-ray diffraction. These three compounds all display new topologies. Compound 1 exhibits a 3D (2,3,10)-connected framework with (4·62)2(412·618·811·104)(4)2 topology. Compound 2 possesses a 2D 3-nodal layer with (416·614·811·104)(43)2(4)2 topology. Compound 3 features a 2D (3,3,8,8)-connected structure with unprecedented (3·42)2(34·46·56·68·73·8) topology. The diverse structures of these three compounds demonstrate that the distinctive coordination modes of different metals have a significant impact on the construction of MOFs. Moreover, the photoluminescence properties of 1 and the magnetic properties of 2 and 3 have been studied and discussed.
Co-reporter:Kang Liu, Xu Han, Yongcun Zou, Yu Peng, Guanghua Li, Zhan Shi, Shouhua Feng
Inorganic Chemistry Communications 2014 Volume 39() pp:131-134
Publication Date(Web):January 2014
DOI:10.1016/j.inoche.2013.11.011
•Two cadmium-organic frameworks were synthesized and structurally characterized.•We found an in situ reaction in which a new ligand dpmtz was generated.•Cd(dpmtz)2 shows selective adsorption behavior of CO2 over N2.Two cadmium-organic frameworks were synthesized, namely, [Cd(dptz)2]·{Cd[(NH2)2CS]4}·(NO3)4 (1, dptz = 3,6-di-(pyridin-4-yl)-1,2,4,5-tetrazine) and Cd(dpmtz)2 (2, dpmtz = 3,6-di-(pyridin-4-yl)-1,2-dihydro-1-mercapto-1,2,4,5-tetrazine). Compound 1 was obtained by the self-assembly of dptz, Cd(SPh)2 and thiourea under solvothermal conditions. Compound 2 was prepared through an in situ ligand reaction in which generated a new ligand dpmtz only by changing reaction temperature. Compound 1 and 2 were characterized by single-crystal X-ray structure determination, thermogravimetric analysis and powder X-ray diffraction studies. The adsorption behavior shows that compound 2 has selective adsorption capacities of CO2 over N2.By changing the reaction temperature, we synthesize and characterize compound Cd(dpmtz)2 which shows selective adsorption behavior of CO2 over N2.
Co-reporter:He Huang, Chunguang Li, Shoujun Zhu, Hailong Wang, Cailing Chen, Zhaorui Wang, Tianyu Bai, Zhan Shi, and Shouhua Feng
Langmuir 2014 Volume 30(Issue 45) pp:13542-13548
Publication Date(Web):November 6, 2014
DOI:10.1021/la503969z
Nitrogen-doped (N-doped) photoluminescent carbon dots (CDs) were prepared by a one-pot microwave-assisted hydrothermal treatment using histidine as the sole carbon source in the absence of acid, alkali, or metal ions. With a diameter of 2–5 nm, the synthesized CDs had apparent lattice fringes and exhibited an excitation-dependent photoluminescent behavior. The CDs were highly yielded, well-dispersed in aqueous solution, and showed high photostability in the solutions of a wide range of pH and salinity. They were used as probes to identify the presence of Fe3+ ions with a detection limit of 10 nM. With confirmed nontoxicity, these CDs could enter the cancer cells, indicating a practical potential for cellular imaging and labeling.
Co-reporter:Feifei Li, Chunguang Li, Jianhua Liu, Xiaomin Liu, Lan Zhao, Tianyu Bai, Qinghai Yuan, Xianggui Kong, Yu Han, Zhan Shi and Shouhua Feng
Nanoscale 2013 vol. 5(Issue 15) pp:6950-6959
Publication Date(Web):21 May 2013
DOI:10.1039/C3NR01530K
Lanthanide-doped core–shell upconversion nanocrystals (UCNCs) have tremendous potential for applications in many fields, especially in bio-imaging and medical therapy. As core–shell UCNCs are mostly synthesized in organic solvents, tedious organic–aqueous phase transfer processes are usually needed for their use in bio-applications. Herein, we demonstrate the first example of one-step synthesis of highly luminescent core–shell UCNCs in the “aqueous” phase under mild conditions using innocuous reagents. A microwave-assisted approach allowed for layer-by-layer epitaxial growth of a hydrophilic NaGdF4 shell on NaYF4:Yb, Er cores. During this process, surface defects of the nanocrystals could be gradually passivated by the homogeneous shell deposition, resulting in obvious enhancement in the overall upconversion emission efficiency. In addition, the up-down conversion dual-mode luminescent NaYF4:Yb, Er@NaGdF4:Ce, Ln (Eu, Tb, Sm, Dy) nanocrystals were also synthesized to further validate the successful formation of the core–shell structure. More significantly, based on their superior solubility and stability in water solution, high upconversion efficiency and Gd-doped predominant X-ray absorption, the as-prepared NaYF4:Yb, Er@NaGdF4 core–shell UCNCs exhibited high contrast in in vitro cell imaging and in vivo X-ray computed tomography (CT) imaging, demonstrating great potential as multiplexed luminescent biolabels and CT contrast agents.
Co-reporter:Qi Zhou, Fen Yang, Bingjing Xin, Guang Zeng, Xiaojing Zhou, Kang Liu, Dingxuan Ma, Guanghua Li, Zhan Shi and Shouhua Feng
Chemical Communications 2013 vol. 49(Issue 74) pp:8244-8246
Publication Date(Web):17 Jul 2013
DOI:10.1039/C3CC43747G
The reversible sorption–desorption of terminal coordinated water molecules and the guest molecules can switch slow magnetic relaxation in a classic lanthanide metal–organic framework system, Dy(BTC)(H2O)·DMF and Dy(BTC).
Co-reporter:Dingxuan Ma, Baiyan Li, Xiaojing Zhou, Qi Zhou, Kang Liu, Guang Zeng, Guanghua Li, Zhan Shi and Shouhua Feng
Chemical Communications 2013 vol. 49(Issue 79) pp:8964-8966
Publication Date(Web):05 Aug 2013
DOI:10.1039/C3CC44546A
We report here a luminescent metal–organic framework [Zn3(TDPAT)(H2O)3] [TDPAT = 2,4,6-tris(3,5-dicarboxyl phenylamino)-1,3,5-triazine] exhibiting strong luminescence at room temperature, which can serve as the first case of a dual functional luminescent sensor for quantitatively detecting the concentration of nitrobenzene and temperature.
Co-reporter:Fen Yang, Qi Zhou, Yiquan Zhang, Guang Zeng, Guanghua Li, Zhan Shi, Bingwu Wang and Shouhua Feng
Chemical Communications 2013 vol. 49(Issue 46) pp:5289-5291
Publication Date(Web):23 Apr 2013
DOI:10.1039/C3CC00277B
We have investigated the dynamics of the magnetization of three four-coordinate mononuclear cobalt(II) compounds, which are synthesized conveniently and are air stable. Slow magnetic relaxation effects were observed for the compounds in the presence of a dc magnetic field.
Co-reporter:Bingjing Xin, Guang Zeng, Lu Gao, Yun Li, Shanghua Xing, Jia Hua, Guanghua Li, Zhan Shi and Shouhua Feng
Dalton Transactions 2013 vol. 42(Issue 21) pp:7562-7568
Publication Date(Web):13 Mar 2013
DOI:10.1039/C3DT50238D
A copper(I) halide-based compound with a formula of [Cu4I3(DABCO)2]I3 (DABCO = N,N′-dimethyl-1,4-diazabicyclo[2.2.2]octane) has been prepared by solvothermal reactions. This compound has been characterized by single-crystal X-ray diffraction, elemental analysis, IR, TG, XPS and powder X-ray diffractions. Structure analyses reveal that this compound is constructed by unprecedented cationic cluster [Cu8I6]2+ and organic ligand DABCO and the channels of this compound are occupied by I2 and I−. The guest I2 and I− can move freely in and out of the host-framework. UV/vis spectra confirm that the I2 molecules in the channels can release into some organic solvents and IR spectra confirm the I− was exchanged by SCN−. In addition, the luminescent properties of this compound in the solid state have also been investigated.
Co-reporter:Chunguang Li, Tianyu Bai, Feifei Li, Long Wang, Xiaofeng Wu, Long Yuan, Zhan Shi and Shouhua Feng
CrystEngComm 2013 vol. 15(Issue 3) pp:597-603
Publication Date(Web):27 Nov 2012
DOI:10.1039/C2CE26516H
A new facile solution method for the synthesis of high quality lead selenide (PbSe) nanocrystals with controllable size and shape was developed. A Pb–stearate complex and oleylamine–selenium (OLA–Se) were used as new precursors to prepare monodispersed nanocrystals instead of the traditional lead oxide (PbO) and trioctylphosphine–selenium (TOPSe). Both of the lead and chalcogenide precursors used in this method are inexpensive and air-stable, which largely reduces the cost of the reaction and simplifies the synthetic process. Five different shapes including quasi-spherical, cubic, octahedral, cuboctahedral and star shaped monodispersed PbSe nanocrystals were obtained, and the particle size can be easily tuned from ∼18 nm to ∼50 nm by varying the amount of oleic acid (OA) while keeping the amount of oleylamine (OLA) fixed. Oleic acid based growth orientation and shape evolution mechanism in double stabilizer surfactants was investigated in detail. The etching of PbSe nanocrystals was also observed when they were dispersed in toluene containing excessive amine over time, the etching process of oleylamine occurred on particle surfaces, and a new framework composed of nanorods formed around the nanocrystals. An ITO–PbSe–Al device based on a film of PbSe nanocrystals was constructed. The dark steadystate I–V characteristics of the films before and after ligand exchange revealed a broad prospect for the use of PbSe nanocrystals in light detection and infrared solar cells.
Co-reporter:Feifei Li, Chunguang Li, Xiaomin Liu, Tianyu Bai, Wenjun Dong, Xiao Zhang, Zhan Shi and Shouhua Feng
Dalton Transactions 2013 vol. 42(Issue 6) pp:2015-2022
Publication Date(Web):23 Nov 2012
DOI:10.1039/C2DT32295A
Monodisperse water-soluble LaF3:Ln3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile and environmentally-friendly microwave-assisted modified polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs can be well dispersed in hydrophilic solutions with small sizes in the range of 9–12 nm. The LaF3:Ln3+ NCs (Ln = Eu, Nd, Ce, Tb, Yb, Er, Yb, Ho and Yb, Tm) have the unique feature of up–down conversion from visible to NIR emission owing to the ladder-like arranged energy levels of Ln3+ and in particular, the high efficiency upconversion of the two-photon, obtained from excitation by a continuous 980 nm laser. This investigation focuses on both the up and down conversion fluorescence properties of water-soluble monodisperse crystalline LaF3:Ln3+ NCs in such a small size. Furthermore, the three-dimensional PDMS rod-like fluorescence displays and a silica surface modification by a core/shell structure on the obtained NCs can improve the biocompatibility, indicating potential applications in optical 3D devices and as bio-probes.
Co-reporter:Qi Zhou, Fen Yang, Dan Liu, Yu Peng, Guanghua Li, Zhan Shi and Shouhua Feng
Dalton Transactions 2013 vol. 42(Issue 4) pp:1039-1046
Publication Date(Web):31 Oct 2012
DOI:10.1039/C2DT31050C
A family of 3d–4f heterometallic compounds [Na2FeIII6DyIII2(N3)4(HL)4(CH3O)4(PhCO2)6] (1, H4L = 2-{[(2-hydroxy-3-methoxyphenyl)methylene]amino}-2-(hydroxymethyl)-1,3-propanediol), [Na2FeIII6DyIII2(N3)4(L′)4(CH3O)4(PhCO2)6(H2O)] (2, H3L′ = (E)-2-ethyl-2-(2-hydroxy-3-methoxybenzylideneamino)propane-1,3-diol), [Na2FeIII6DyIII2(N3)4(L′)4(CH3O)4(ButCO2)6] (3) [Na2FeIII6YIII2(N3)4(L′)4(CH3O)4(PhCO2)6(H2O)] (4), and [Na2FeIII6GdIII2(N3)4(L′)4(CH3O)4(PhCO2)6(CH3OH)2] (5) have been prepared using Schiff-base ligands, trinuclear iron precursor complexes, azides and lanthanide nitrates as reactants. In compounds 1 and 2, the structure of the [Na2FeIII6DyIII2] cluster forms a couple of cis,trans-isomers with substitution of methyl for a free hydroxyl group which belongs to the Schiff-base ligand. When the pivalates are employed instead of bulkier benzoates, the trans-[Na2FeIII6DyIII2] clusters act as network nodes in the formation of rhombic grid-like layered structures in compound 3. Compounds 2, 4 and 5 have similar metallic cores, only with different crystal solvent molecules. The magnetic measurements on all the compounds indicate dominant antiferromagnetic interactions between the metal centers.
Co-reporter:Tianyu Bai, Chunguang Li, Daxin Liang, Feifei Li, Di Jin, Zhan Shi and Shouhua Feng
CrystEngComm 2013 vol. 15(Issue 33) pp:6483-6490
Publication Date(Web):07 Jun 2013
DOI:10.1039/C3CE40491A
1,5-Bis(3-methylimidazole-2-selone)pentane (Pbis), which belongs to the coordination chemistry of organochalcogenone compounds, was used as a novel Se precursor to purposely synthesize various metal selenide nanostructures. By this method, CdSe, Bi2Se3, ZnSe and PbSe have been successfully prepared and all exhibit relatively uniform size and morphology. High water solubility and good dispersity is achieved by using poly (vinyl pyrrolidone) (PVP) as the capping agent. At the same time, the shape of the metal selenide nanostructures could be controlled by adjusting the experimental conditions. The thermoelectric properties of the Bi2Se3 have also been discussed. It would be expected that Pbis could be more widely used to prepare more metal selenide nanostructures with uniform morphologies, sizes, and remarkable properties.
Co-reporter:Baiyan Li, Yiming Zhang, Dingxuan Ma, Lu Li, Guanghua Li, Guodong Li, Zhan Shi and Shouhua Feng
Chemical Communications 2012 vol. 48(Issue 49) pp:6151-6153
Publication Date(Web):25 Apr 2012
DOI:10.1039/C2CC32384B
A new strategy toward constructing bifunctionalized MOFs has been developed based on post-synthetic modification of MOFs on organic ligands and coordinatively unsaturated metal sites, respectively. Based on this strategy, an organo-bifunctionalized MOF catalyst has been synthesized for the first time and successfully applied in one-pot tandem reaction.
Co-reporter:Fen Yang, Baiyan Li, Wei Xu, Guanghua Li, Qi Zhou, Jia Hua, Zhan Shi, and Shouhua Feng
Inorganic Chemistry 2012 Volume 51(Issue 12) pp:6813-6820
Publication Date(Web):June 1, 2012
DOI:10.1021/ic300546z
Here, we report two three-dimensional metal–organic frameworks of formula [Co2(4-ptz)2(bpp)(N3)2]n (1) and [Co3(OH)2(bdt)2(bpp)2(H2O)2]n (2), which were synthesized by hydrothermal reaction from the respective tetrazole ligand (5-(4-pyridyl)tetrazole (4-H-ptz) for 1 and 5,5′-(1,4-phenylene)bis(1-H-tetrazole) (H2bdt) for 2), long and flexible pyridyl-containing ligand 1,3-bi(4-pyridyl)propane (bpp), NaN3, and CoCl2. Both 1 and 2 consist of well-isolated one-dimensional cobalt(II) alternating chains further linked by the bpp and/or the tetrazole ligand, while their chain structures are totally different. The chains of 1 are formed by Co2+ ions bridged by single μ-EE-N3 and triple (μ-EO-N3)(μ-tetrazole)2 alternately, whereas the Co2+ ions are bridged by μ3–OH to form Co3(OH)2 chains in compound 2. Magnetic measurements demonstrate that compound 1 contains an alternating antiferromagnetic (AF)/ferromagnetic (FM) ferrimagnetic chain, while compound 2 exhibits the coexistence of spin canting, slow magnetic dynamics, and finite-size effect, with alternating AF/AF/FM ferrimagnetic chains.
Co-reporter:Qi Zhou, Fen Yang, Dan Liu, Yu Peng, Guanghua Li, Zhan Shi, and Shouhua Feng
Inorganic Chemistry 2012 Volume 51(Issue 14) pp:7529-7536
Publication Date(Web):July 2, 2012
DOI:10.1021/ic300125y
A family of fluoride-bridged lanthanide compounds, [DyIIIF(oda)(H2O)3] (1, oda = oxidiacetate) and [LnIII2F2(oda)2(H2O)2] (Ln = Tb(2) and Dy(3)), was synthesized and characterized. To investigate the effects of bridging ligands on magnetic behaviors, two hydroxyl-bridged complexes of formulas [LnIII2(OH)2(oda)2(H2O)4] (Ln = Tb(4) and Dy(5)) were also synthesized. Magnetic measurements show that the magnetic behaviors of the compounds are obviously distinct. Compounds 1, 2, and 3 show ferromagnetic interactions, while only antiferromagnetic interactions are observed in compounds 4 and 5. Among these compounds, 1 and 3 show frequency-dependent ac-susceptibility indicative of slow magnetic relaxation. Because the structures of Dy2 cores are very similar in compounds 3 and 5, it may be inferred that the differences of bridging ligands are mainly responsible for the distinct magnetic exchange interactions and relaxation dynamics.
Co-reporter:Xiaojing Zhou, Baiyan Li, Guanghua Li, Qi zhou, Zhan Shi and Shouhua Feng
CrystEngComm 2012 vol. 14(Issue 14) pp:4664-4669
Publication Date(Web):19 Apr 2012
DOI:10.1039/C2CE25328C
Two three-dimensional metal–organic frameworks, [Cd3K(L1)6(H2O)3](OH)(DMF)4 (1) (HL1 = 3-pyrid-4-ylbenzoic acid) and [Cd(L2)2](DMF)(H2O)0.25 (2) (HL2 = 4-pyrid-4-ylbenzoic acid), have been synthesized by using two ligands with different configuration and characterized by X-Ray diffraction and other techniques. Compound 1 shows a nanosize channel which is constructed by interlocked six-fold one-dimensional helical chains with the asymmetrical ligand HL1. Compared with compound 1, compound 2 shows a larger size channel with the symmetrical ligand HL2 in a single set of diamond cage. Nevertheless, the whole structure with the 4-fold interpenetrated diamondoid network leads to the absence of void space. The two compounds exhibit fascinating luminescence because of the interaction between Cd ions and organic ligands.
Co-reporter:Chunguang Li, Feifei Li, Tao Li, Tianyu Bai, Long Wang, Zhan Shi and Shouhua Feng
Dalton Transactions 2012 vol. 41(Issue 16) pp:4890-4895
Publication Date(Web):08 Mar 2012
DOI:10.1039/C2DT30064H
Water-dispersible Re3+ doped CeF3 colloidal nanocrystals with well controllable morphology and high crystallinity have been successfully synthesized through a solvothermal process. The TEM images illustrate that the Re3+ doped CeF3 nanocrystals are rectangular (or cubic) with a mean diameter of ∼10 nm. The excellent dispersibility in some of the polar solvents including water is achieved by using polyethyleneimine as the capping agent. The amine groups of the polymer chains on one hand bind to the nanocrystal surface; on the other hand the free ones could link to functional materials including bio-molecules. The CeF3 nanocrystals doped with Tb3+ and Dy3+ ions show the characteristic emission of Tb3+ 5D4–7FJ (J = 6–3, with 5D4–7F5 green emission at 542 nm as the strongest one) and Dy3+ 4F9/2–6H15/2 (blue-green color at 478 nm) and 4F9/2–6H13/2 (yellow color at 571 nm) transitions, respectively. The energy transfer from Ce3+ to Tb3+ and Dy3+ was also investigated in detail. In vitro studies of Re3+ doped CeF3 colloidal nanocrystals on HepG2 cells confirm their excellent biological compatibility. The obtained solid CeF3:Tb3+/PDMS nanocomposites are very stable and flexible and exhibit strong green photoluminescence upon UV excitation.
Co-reporter:Baiyan Li, Fen Yang, Yiming Zhang, Guanghua Li, Qi Zhou, Jia Hua, Zhan Shi and Shouhua Feng
Dalton Transactions 2012 vol. 41(Issue 9) pp:2677-2684
Publication Date(Web):12 Jan 2012
DOI:10.1039/C1DT11654A
Eight 2D and 3D coordination polymers, [Mn(NBPDC)(1,4-bimb)]n (1), [Zn(NBPDC)(1,4-bimb)]n (2), [Cd(NBPDC)(1,4-bimb)]n (3), [Mn2(NBPDC)2(1,3-bimb)(H2O)]n (4), {Zn(NBPDC)(1,3-bimb)}n (5), [Cd2(NBPDC)2(1,3-bimb)2(H2O)]n (6), [Mn(NBPDC)(4,4′-bimbp)]n (7), and [Cd2(NBPDC)2(4,4′-bimbp)2]n (8), (NBPDC = 2,2′-dinitro-4,4′-biphenyldicarboxyl acid, 1,4-bimb = 1,4-bis(imidazol-1-ylmethyl) benzene, 1,3-bimb = 1,3-bis(imidazol-1-ylmethyl) benzene, and 4,4′-bimbp = 4,4′-(bis(imidazol-l-ylmethylene)) biphenyl), have been prepared and structurally characterized. In these coordination polymers, NBPDC and three N-donor ligands link different metal ions and SBUs to construct diverse architectures. Compounds 1 and 3 are isomorphic, showing a two-fold interpenetrating pcu topology. Compound 2 presents a 2D (4, 4) net. Compound 4 is a hex framework built by the linkage of ligands with infinite rod-shaped SBUs. Compound 5 presents a unprecedented eight-fold interpenetrating sra topology. Compound 6 exhibits a unique 2D {63}{65.8} topology with four-fold interpenetrating structure. Compound 7 presents a 3D hex topology, and compound 8 shows a (4, 4) net. The magnetic properties of compounds 1, 4, and 7 have been characterized. Compound 1 displays interesting spin-canting antiferromagnetism and metamagnetism simultaneously. Compound 7 exhibits spin-canting antiferromagnetism.
Co-reporter:Chunguang Li;Tianyu Bai;Tao Li;Feifei Li;Wenjun Dong;Shouhua Feng
European Journal of Inorganic Chemistry 2012 Volume 2012( Issue 8) pp:1204-1209
Publication Date(Web):
DOI:10.1002/ejic.201101183
Abstract
Visible-light-responsive photonic structures have been prepared in alcohol solvents by using silica-modified PbS colloidal nanocrystal clusters (CNCs) as building blocks. Further modification of the PbS CNCs with a coating of silica allowed the dispersion of the particles into nonaqueous solutions. Repulsive electrostatic and solvation forces contribute to the self-assembly of the PbS@SiO2 spheres. The core–shell particles have optical properties similar to those of CNCs, and they can also be assembled into close-packing films through simple drop-casting on silicon substrates. Embedding droplets of such a PbS@SiO2 colloidal solution in a polymer matrix produced solid composite materials with visible-light-responsive optical properties with potential applications as sensors and optical switches.
Co-reporter:Dr. Baiyan Li;Zhijuan Zhang;Dr. Yi Li;Kexin Yao;Yihan Zhu;Zhiyong Deng;Fen Yang;Xiaojing Zhou;Dr. Guanghua Li;Haohan Wu;Nour Nijem;Dr. Yves J. Chabal;Dr. Zhiping Lai;Dr. Yu Han;Dr. Zhan Shi;Dr. Shouhua Feng;Dr. Jing Li
Angewandte Chemie International Edition 2012 Volume 51( Issue 6) pp:1412-1415
Publication Date(Web):
DOI:10.1002/anie.201105966
Co-reporter:Dr. Baiyan Li;Zhijuan Zhang;Dr. Yi Li;Kexin Yao;Yihan Zhu;Zhiyong Deng;Fen Yang;Xiaojing Zhou;Dr. Guanghua Li;Haohan Wu;Nour Nijem;Dr. Yves J. Chabal;Dr. Zhiping Lai;Dr. Yu Han;Dr. Zhan Shi;Dr. Shouhua Feng;Dr. Jing Li
Angewandte Chemie 2012 Volume 124( Issue 6) pp:1441-1444
Publication Date(Web):
DOI:10.1002/ange.201105966
Co-reporter:Feifei Li;Dr. Chunguang Li;Dr. Xiaomin Liu;Ying Chen;Tianyu Bai;Long Wang;Dr. Zhan Shi;Dr. Shouhua Feng
Chemistry - A European Journal 2012 Volume 18( Issue 37) pp:11641-11646
Publication Date(Web):
DOI:10.1002/chem.201201309
Abstract
Monodisperse water-soluble hexagonal phase Ln3+-doped NaGdF4 upconverting nanocrystals (UCNCs) have been successfully fabricated by means of a fast, facile, and environmentally friendly microwave-assisted route with polyethylenimine as the surfactant. Fine-tuning of the UC emission from visible to near-IR and finally to white light has been achieved. Furthermore, studies of the magnetic resonance imaging as well as the magnetization (magnetization–magnetic field curves) and the targeted recognition properties of FA-coupled amine-functionalized NaGdF4@SiO2 UCNCs indicate that the obtained NaGdF4 UCNCs can be potential candidates for dual-mode optical/magnetic bioapplications.
Co-reporter:Baiyan Li, Yiming Zhang, Guanghua Li, Dan Liu, Yan Chen, Weiwei Hu, Zhan Shi and Shouhua Feng
CrystEngComm 2011 vol. 13(Issue 7) pp:2457-2463
Publication Date(Web):01 Feb 2011
DOI:10.1039/C0CE00682C
Six coordination polymers, [Mn2(nbpdc)2(bib)]n (1), [Co2(nbpdc)2(bib)1.5(H2O)2]n (2), [Ni2(nbpdc)2(bib)1.5(H2O)2]n (3), [Cu3(nbpdc)2(bib)(OH)2]n (4), [Zn2(nbpdc)2(bib)]n (5), and [Cd2(nbpdc)2(bib)(H2O)]n (6), (H2nbpdc = 2,2′-dinitro-4,4′-biphenyldicarboxylic acid, bib = 1,4-bis(imidazol-1-yl)butane), have been prepared and structurally characterized. In these compounds, nbpdc and bib link different secondary building units (SBUs) to construct various architectures based on different metals. Compounds 1 and 5 present a 3D pcu net based on an infinite rod-shaped SBU. Compounds 2 and 3 have the same 2D double-layer structure with a unique {412.52.6} topology, showing an interesting self-penetration feature. Compound 4 presents a 3D framework with hex topology. Compound 6 shows a 3D framework with unprecedented (412.513.63)(48.55.62) topology based on two different unusual infinite and finite SBUs, and has an interesting self-penetrating feature. Therefore, different metal ions influence the final structures of coordination polymers. Magnetic properties of compounds 1 and 4 have been characterized.
Co-reporter:Baiyan Li, Guanghua Li, Dan Liu, Yu Peng, Xiaojing Zhou, Jia Hua, Zhan Shi and Shouhua Feng
CrystEngComm 2011 vol. 13(Issue 5) pp:1291-1298
Publication Date(Web):29 Oct 2010
DOI:10.1039/C0CE00252F
Five coordination polymers, [Mn2(NBPDC)2(bpp)]n (1), [Co4(NBPDC)4(bpp)2(H2O)5.25]n (2), [Ni(NBPDC)(bpp)(H2O)2]n (3), [Zn(NBPDC)(bpp)]n (4) and [Cd2(NBPDC)2(bpp)]n (5) (NBPDC = 2,2′-dinitro-4,4′-biphenyldicarboxyl acid, bpp = 1,3-bi(4-pyridyl)propane), have been prepared and structurally characterized. In these compounds, NBPDC and bpp exhibit different coordination modes tuned by different metal ions, and construct various architectures by bridging a variety of inorganic building units. Compound 1 presents a hex net with point symbol for net: {36.418.53.6}. Compound 2 shows a self-penetrating ilc topology by linking Co4 clusters with NBPDC and bpp. Compound 3 presents a 2D structure with (4, 4) topology. Compound 4 shows a diamond network with a 5-fold interpenetrating architecture, featuring left-handed and right-handed helix chains. Compound 5 presents a pcu topology by linking rod-shaped secondary building units. The magnetic properties of compounds 1 and 2 have been characterized.
Co-reporter:Ying Zhao, Chunguang Li, Feifei Li, Zhan Shi and Shouhua Feng
Dalton Transactions 2011 vol. 40(Issue 3) pp:583-588
Publication Date(Web):01 Dec 2010
DOI:10.1039/C0DT01198C
Highly water-dispersible Mn3O4 nanocrystals with well-controlled size, size distribution and high crystallinity have been successfully synthesized through a modified polyol process. Poly(acrylic acid) is used as the capping agent, conferring upon the particles high water-dispersion, of which the carboxylate groups partially bind to the nanocrystal surface and the uncoordinated carboxylate groups extend into water. The water-dispersible Mn3O4 nanocrystals can be further transferred to nonpolar solvent by linking oleylamine molecules through electrostatic interaction. The as-prepared Mn3O4 nanocrystals exhibit ferromagnetic behavior at low temperature and weak paramagnetic behavior at room temperature. The Curie–Weiss temperature and the blocking temperature are 40 K and 32 K, respectively.
Co-reporter:Baiyan Li, Fen Yang, Guanghua Li, Dan Liu, Qi Zhou, Zhan Shi, and Shouhua Feng
Crystal Growth & Design 2011 Volume 11(Issue 5) pp:1475-1485
Publication Date(Web):April 12, 2011
DOI:10.1021/cg101335a
Ten coordination polymers, [Mn9(L1)8(OH)2(H2O)21]n (1), [Mn3.5(L1)3(OH)(H2O)8]n (2), [Cu(L1)(H2O)1.375]n (3), {Zn(L1)(DMF)[(CH3)2NH]0.25}n (4), [Zn2(L1)2(4,4′-bipy)(DMF)0.5(H2O)0.5]n (5), [Zn2(L1)2(bib)(H2O)6.75]n (6), [Cd2(L1)2(H2O)7.5]n (7), [Cd2(L1)2(H2O)7.5]n (8), [Cd(L1)(bpp)]n (9), and [Cd2(L1)2(bib)(H2O)6]n (10) (L1 = 4-amino-3,5-bis(3-carboxyphenyl)-1,2,4-triazole, bib = 1,4-bis(imidazol)butane, bpp = 1,3-bi(4-pyridyl)propane), have been prepared and structurally characterized. In these compounds, L1 exhibits different coordination modes and conformations, constructing various architectures by bridging a variety of building units and adjusting the roles of different organic bases. Compound 1 presents a 3D diamond topology built by bridging rare Mn9 clusters with L1. Compound 2 is a 1D chain structure. Compound 3 shows a unique 2D {42.6}2{44.69.82} topology by linking paddle-wheel SBU with L1. Compound 4 is a 1D double chain structure. Compound 5 presents an unusual 2D V2O5 net with {42.63.8}{42.6} topology by linking 4,4′-bipy with the double chains constructed by L1 and Zn(II) atoms. Compound 6 exhibits a rare 3D coe topology with point (Schlafli) symbol for net: {42.6.102.12}{42.6}. Compound 7 presents an unusual 1D strap shaped structure. Compound 8 is a zero-periodic structure. Compound 9 shows an interesting 4-connected 2D interpenetrating net with point (Schlafli) symbol {44.62}. Compound 10 is a 1D “H” shaped structure when it is viewed from the c axis direction. The luminescent properties of compounds 4−7 and 9, and the magnetic properties of compound 1 have been investigated in the solid state.
Co-reporter:Baiyan Li;Di Jin;Benhua Ma;Dan Liu;Guanghua Li, ;Shouhua Feng
European Journal of Inorganic Chemistry 2011 Volume 2011( Issue 1) pp:35-38
Publication Date(Web):
DOI:10.1002/ejic.201001061
Abstract
Hydro(solvo)thermal in situ reactions provide an important strategy for the construction of coordination polymers with interesting structures and topologies. In our study, two interesting coordination polymers [Cu(C2O4)(L1)0.5(H2O)2.5]n (1) (L1 = 3,5-bipyridyl-1,2,4-triazole) and [Cu3O2(NO3)2(L2)2(H2O)2]n (2) {L2 = 5-(3-pyridyl)-1,2,4-triazolo[3,2-c](7-aza-1-H-indazole)} were prepared through an in situ ligand deaminization reaction and an in situ ligand intramolecular amination cyclization reaction, respectively. To the best of our knowledge, the formation of an indazole cycle through an in situ intramolecular amination cyclization reaction is reported for the first time. The two coordination polymers present a rare NiP2 topology and kgd topology. Their magnetic properties have also been studied.
Co-reporter:Baiyan Li;Di Jin;Benhua Ma;Dan Liu;Guanghua Li, ;Shouhua Feng
European Journal of Inorganic Chemistry 2011 Volume 2011( Issue 1) pp:
Publication Date(Web):
DOI:10.1002/ejic.201090117
Abstract
The cover picture shows that two coordination polymers exhibiting rare NiP2 topology and kgd topology are constructed on the basis of Cu2+ and ligands 3,5-bipyridyl-1,2,4-triazole and 5-(3-pyridyl)-1,2,4-triazolo[3,2-c](7-aza-1H-indazole) formed through in situ ligand deaminization and in situ ligand intramolecular amination cyclization reactions. Details are discussed in the Short Communication by Z. Shi et al. on p. 35 ff. Dedicated to Professors Ruren Xu and Wenqin Pang on the occasion of their 80th birthdays, with our warmest congratulations and best wishes.
Co-reporter:Jia Li;Yu Peng;Hongwei Liang;Yang Yu;Bingjing Xin;Guanghua Li, ;Shouhua Feng
European Journal of Inorganic Chemistry 2011 Volume 2011( Issue 17) pp:2712-2719
Publication Date(Web):
DOI:10.1002/ejic.201100227
Abstract
A series of 3D interpenetrating metal-organic frameworks, namely, [Zn3(BPDC)3(4-BPT)1.5]·1.5DMF [1, BPDC = biphenyl-4,4′-dicarboxylic acid, 4-BPT = 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole, DMF = dimethylformamide], [Zn3(BPDC)3(4-PYTZ)1.5]·1.5DMF [2, 4-PYTZ = 3,6-bis(pyridin-4-yl)-1,2,4,5-tetrazine], [Zn2(OBA)2(4-PYTZ)]·2DMF [3, OBA = 4,4′-oxybis(benzoate)], [Zn2(OBA)2(3-PYTZ)·Zn2(OBA)2(DMF)2]·7DMF [4, 3-PYTZ = 3,6-bis(pyridin-3-yl)-1,2,4,5-tetrazine] and [Zn2(OBA)2(3-BPT)]·2.5DMF [5, 3-BPT = 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole] were synthesized by the reaction of Zn(NO3)2·6H2O with various dipyridyl derivatives and rigid or nonrigid aromatic dicarboxylate ligands. These five compounds were constructed by paddle-wheel-type coordination of ZnII pairs and mixed ligands, which can be simplified as nodes and linkers to generate a variety of topologies. Compounds 1 and 2 exhibit threefold interpenetrated 6-connected pcu topology. The interpenetration observed in compounds 1 and 2 is a rare case of heterointerpenetration. The structure of 3 is derived from a 2D double interpenetrated rhombic grid substructure, and is an interesting example of a self-catenated framework displaying a 6-connected uninodal framework with a point symbol (44.610.8). Compound 4, which is derived from a crosslinked threefold interpenetrated substructure with pts topology, displays a self-catenated 4,6-connected binodal framework with the point symbol (42.62.72) (42.68.7.84). Compound 5 exhibits a self-catenated 6-connected structure with rob topology, and with the point symbol (48.66.8). Compounds 1–5 also display varied luminescence properties in the solid state.
Co-reporter:Chunguang Li, Ying Zhao, Feifei Li, Zhan Shi and Shouhua Feng
Chemistry of Materials 2010 Volume 22(Issue 5) pp:1901
Publication Date(Web):January 28, 2010
DOI:10.1021/cm903648c
Highly monodisperse PbS colloidal nanocrystal clusters with well controllable size and size distribution, high crystallinity and high water solubility have been successfully synthesized through a modified polyol process. Thiourea stock solution was rapidly injected into diethyene glycol solution containing lead precursor at an elevated temperature to produce PbS clusters.The high reaction temperature allows for control over size and size distribution and yields highly crystalline products.The superior water solubility is achieved by using poly(acrylic acid) as the capping agent. The caboxylate groups of which partially bind to the nanocrystal surface and partially extend into the surrounding water. The uncoordinated caboxylate groups also bring high density of charges to the surface of CNCs at the same time. Moreover, the CNCs exhibit visible or near-infrared absorption even though the overall sizes of the particles are larger than the excitation Bohr radius. This is due to the fact that the clusters are composed of primary nanocrystals and the whole cluster shows optical property similar to the tiny primary nanocrystals.
Co-reporter:Baiyan Li, Yu Peng, Guanghua Li, Jia Hua, Yang Yu, Di Jin, Zhan Shi and Shouhua Feng
Crystal Growth & Design 2010 Volume 10(Issue 5) pp:2192
Publication Date(Web):March 24, 2010
DOI:10.1021/cg901438x
Twelve Cu(I) coordination polymers, [CuCl(L1)]n (1), [Cu4I4(L1)2]n (2), {[Cu2I2(L1)]·0.5I2}n (3), [Cu3I3(L1)]n (4), [Cu2Br2(L1)]n (5), [CuBr(L1)]n (6), [Cu2Cl2(L1)]n (7), [Cu2Br2(L2)]n (8), [CuBr(L2)]n (9), [CuI(L2)]n (10), [Cu3I3(L2)]n (11), and Cu2I2(L3)2 (12) (L1 = 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole, L2 = 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole and L3 = 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole), have been prepared and structurally characterized. In these compounds, 4-amino-3,5-bis(n-pyridyl)-1,2,4-triazole (n-bpt) exhibits different coordination modes tuned by the isomeric effect and the anion effect, forming various architectures by bridging a variety of CuX (X = Cl, Br, or I) building units. Compound 1 presents a layer structure with (4, 4) topology built by bridging adjacent (CuCl)∞ chains with L1. Compound 2 shows an unusual one-dimensional strap structure by linking a rare Cu8I8 unit with L1. Compounds 3 and 4 present two-dimensional layers with (6, 3) topology. Compound 5 shows a three-dimensional ZnCl2 network with {3.6.74}{3.62.73}2 topology. Compound 6 exhibits a layer with (4, 82) network topology. A complicated three-dimensional framework for 7 is constructed with unique {6.82}2{6.85} topology. Compounds 8 and 9 are both chains, and hydrogen-bonding and π−π interactions play important roles in stabilizing the extended structure. Compound 10 is a layer with (4, 4) topology. An interesting double layer compound exhibiting complicated structure is found for 11. Compound 12 is a zero-periodic compound. The luminescent properties of compounds 4−6, 8, 9, and 12 have been investigated in the solid state.
Co-reporter:Dan Liu, Qi Zhou, Yan Chen, Fen Yang, Yang Yu, Zhan Shi and Shouhua Feng
Crystal Growth & Design 2010 Volume 10(Issue 6) pp:2661
Publication Date(Web):May 6, 2010
DOI:10.1021/cg100145e
Two 2D coordination polymetic networks compounds of [Na3MnIII6(μ6-O)(thme)4(PhCO2)6(H2O)]·OH (1) and [NaMnIII4MnII8O2(thme)4(N3)(OAc)8(AcOH)2(CH3O)4] (2) with 1,1,1-tris(hydroxymethyl)-methane (H3thme) as the ligand have been synthesized and structurally characterized by X-ray diffraction, IR spectra, and elemental analyses, where the homovalence hexanuclear Mn cluster in compound 1 and the mixed-valence dodecanuclear Mn cluster in compound 2 acted respectively as network nodes in the formation of honeycomb-shaped and rhombic grid-like layer structures. In addition, magnetic studies of 1 reveal that antiferromagnetically coupled paramagnetic cluster behavior is operative within the hexameric Mn6 cluster and 2 exhibits antiferromagnetic coupling interactions and interesting frequency dependent in-phase as well as out-of-phase susceptibility signals are observed, respectively.
Co-reporter:Dan Liu, Qi Zhou, Yan Chen, Fen Yang, Yang Yu, Zhan Shi and Shouhua Feng
Dalton Transactions 2010 vol. 39(Issue 23) pp:5504-5508
Publication Date(Web):15 May 2010
DOI:10.1039/C000731E
Reactions of MnX2 meltsalt (X = Cl and ClO4) and a quinquedentate Schiff base ligand together with its coligand azides in MeOH produced the unprecedented assembly of novel octa- and hexadecanuclear manganese clusters containing two and four alternant tetrahedral MnIII3MnII cores bridged by Schiff base ligands and versatile azides groups. The magnetic measurements on both compounds indicate dominant antiferromagnetic interactions between the metal centers. This synthetic approach may suggest a promising pathway to the design of novel Schiff base-based polynuclear manganese clusters and novel magnetic materials.
Co-reporter:Chunguang Li;Ying Zhao;Ling Wang;Guanghua Li, ;Shouhua Feng
European Journal of Inorganic Chemistry 2010 Volume 2010( Issue 2) pp:217-220
Publication Date(Web):
DOI:10.1002/ejic.200900833
Abstract
We report on the synthesis of ZnO colloidal nanocrystal clusters with well-tunable particle size and high water solubility by using a high-temperature solution-phase hydrolysis approach. The metal salt hydrolyzed after rapidly injecting a solution of sodium hydroxide in diethylene glycol. Poly(acrylic acid) served as the capping agent to achieve the superior water solubility without any further surface modification. Strong UV emission in the photoluminescence (PL) spectrum due to the existence of the secondary structures despite a particle size reaching ca. 200 nm, and near absence of oxygen vacancy in the sample as indicated by weak emission in the green region. This important feature makes our highly water-soluble ZnO colloidal nanocrystal clusters a promising candidate for potential applications in optoelectronic and lasing devices.
Co-reporter:Zhe Song, Hongze Gao, Guanghua Li, Yang Yu, Zhan Shi and Shouhua Feng
CrystEngComm 2009 vol. 11(Issue 8) pp:1579-1584
Publication Date(Web):07 Apr 2009
DOI:10.1039/B901445D
Three 2D layered zinc coordination polymers: Zn(trz)(HBDC) (1), Zn4(trz)4(4-FBA)4·(H2O)0.5 (2) and Zn4(trz)4(4-CBA)4 (3) (trz = 1,2,4-triazole, H2BDC = 1,3-benzenedicarboxylic acid, 4-HFBA = 4-fluorobenzoic acid and 4-HCBA = 4-chlorobenzoic acid) have been synthesized by hydrothermal reactions and characterized by IR, elemental analysis, TGA measurements and X-ray single-crystal analysis. Compounds 1–3 have the same 2D layer constructed by zinc(II) with trz and carboxylate. The main difference in the structure of the three compounds is the interactions between the layers. Compound 1 shows unusual intermolecular hydrogen bonding and C–O⋯π interactions, compound 2 exhibits intermolecular hydrogen bonding and C–F⋯π interactions, while compound 3 only shows intermolecular C–Cl⋯π interactions. It is found that the noncovalent intermolecular interactions have an influence on crystal packing.
Co-reporter:Jia Li, Ge Wang, Zhan Shi, Mu Yang, Rudy L. Luck
Solid State Sciences 2009 Volume 11(Issue 11) pp:1955-1960
Publication Date(Web):November 2009
DOI:10.1016/j.solidstatesciences.2009.07.009
A crystallographic investigation of anion–π interactions and hydrogen bonds on the preferred structural motifs of molybdenum(VI) complexes has been carried out. Two molybdenum(VI) network polymers MoO2F4·(Hinca)2 (1) and MoO2F3(H2O)·(Hinpa) (2), where inca = isonicotinamide and inpa = isonipecotamide, have been synthesized, crystallographically characterized and successfully applied to alcohol oxidation reaction. Complex 1 crystallizes in the monoclinic space C2/c: a = 16.832(3) Å, b = 8.8189(15) Å, c = 12.568(2) Å, β = 118.929(3)°, V = 1560.1(5) Å3, Z = 4. Complex 2 crystallizes in the triclinic space P-1: a = 5.459(2) Å, b = 9.189(4) Å, c = 12.204(5) Å, α = 71.341(6)°, β = 81.712(7)°, γ = 77.705(7)°, V = 564.8(4) Å3, Z = 2. Complex 1 consists of hydrogen bonding and anion–π interactions, both of which are considered as important factors for controlling the geometric features and packing characteristics of the crystal structure. The geometry of the sandwich complex of [MoO2F4]2− with two pyridine rings indicates that the anion–π interaction is an additive and provides a base for the design and synthesis of new complexes. For complex 2, the anions and the protonated inpa ligands form a 2D supramolecular network by four different types of hydrogen contacts (N–H⋯F, N–H⋯O, O–H⋯F and O–H⋯O). The catalytic ability of complexes 1 and 2 has also been evaluated by applying them to the oxidation of benzyl alcohol with TBHP as oxidant.
Co-reporter:Xiaomin Liu, Guanghua Li, Yawei Hu, Yang Yu, Minghui Bi, Zhan Shi, Shouhua Feng
Inorganica Chimica Acta 2009 Volume 362(Issue 1) pp:65-70
Publication Date(Web):1 January 2009
DOI:10.1016/j.ica.2008.03.009
The first organically templated molybdenum iodates (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), (C10H8N2)[MoO2(IO3)3] · H3O (2), and uranium iodate (C5H5N)2[(UO2)(IO3)3](IO3) (3), have been successfully synthesized under mild hydrothermal conditions. Compound 1 is simple zero-dimensional units consisting of [(Mo2O5(IO3)4)]2− anions, which can be described as a tetranuclear unit hanged on either side by two [IO3] groups. The [Mo2O5(IO3)4]2− anions are in a close connection through the water molecules and protonated pyridine cations, via hydrogen bonds and intermolecular actions. Compound 2 is built up from [MoO6] octahedra and [IO3] pyramids to two-dimensional layers, in which 4,4′-bipy molecules and water cations are located, forming strong hydrogen bonds with the inorganic framework, leading to pseudo three-dimensional structure. Compound 3 is one-dimensional ribbons containing {[(UO2)(IO3)3](IO3)}2− anions and charge neutrality is achieved by the protonated 4,4′-bipy cations, which reside between two ribbons, forming hydrogen bonds with the inorganic framework and resulting in pseudo two-dimensional structure. Crystal data are as follows: (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), orthorhombic, Pnma, a = 24.097(5) Å, b = 13.532(3) Å, c = 7.836(16) Å, Z = 4, V = 2555.2(9) Å3; (C10H8N2)[MoO2(IO3)3] · H3O (2), monoclinic, C2/c, a = 24.176(5) Å, b = 10.751(2) Å, c = 7.5074(15) Å, β = 107.44(3)°, Z = 8, V = 1861.6(6) Å3; (C5H5N)2[(UO2)(IO3)3](IO3) (3), monoclinic, P21/n, a = 14.430(3) Å, b = 7.3459(15) Å, c = 19.811(4) Å, β = 106.70(3)°, Z = 4, V = 2011.3(7) Å3.The first organically templated molybdenum iodates (C5H6N)2Mo2O5(IO3)4(H2O)2 (1), (C10H8N2)[MoO2(IO3)3] · H3O (2), and uranium iodate (C5H5N)2[(UO2)(IO3)3](IO3) (3), have been successfully synthesized under mild hydrothermal conditions and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric analysis, ICP and elemental analysis.
Co-reporter:Di Li, Ke Ke Huang, Bin Hu, Zhan Shi, Ge Wang, Shou Hua Feng
Journal of Molecular Structure 2009 938(1–3) pp: 82-88
Publication Date(Web):
DOI:10.1016/j.molstruc.2009.09.008
Co-reporter:Jia Li;Ge Wang;Mu Yang;Rudy L. Luck
Structural Chemistry 2009 Volume 20( Issue 6) pp:
Publication Date(Web):2009 December
DOI:10.1007/s11224-009-9515-z
Co-reporter:Jia Li;Ge Wang;Mu Yang;Rudy L. Luck
Structural Chemistry 2009 Volume 20( Issue 5) pp:869-876
Publication Date(Web):2009 October
DOI:10.1007/s11224-009-9485-1
Two molybdenum (VI) hydrogen-bonded network polymers [MoO2F4]·(4,4′-H2bpd)(H2O)2 (1) and [MoO2Cl3(H2O)]·(4,4′-H2bpd)Cl (2) (bpd = bipiperidine) have been synthesized and examined as catalysts for epoxidation of cyclooctene. Complexes of the Mo compounds containing the bpd ligand are prepared and characterized by infrared spectroscopy, thermogravimetric and elemental analyses. They have been structurally characterized by single crystal X-ray diffraction analysis. The structures of both the complexes are shown to be comprised of molybdenum and two protonated N-ligand cations that have resulted in a cross-linked hydrogen-bonded network structure. These complexes are applicable as catalysts for the cis-cyclooctene epoxidation reactions with hydrogen peroxide as a source of oxygen and NaHCO3 as a cocatalyst. It has been observed that the formation of the oxidant peroxymonocarbonate ion, HCO4− by hydrogen peroxide and bicarbonate enhances the epoxidation reaction. Both the complexes have exhibited a good activity and a very high selectivity for the formation of cyclooctene oxide.
Co-reporter:Xiaomin Liu, Guanghua Li, Yawei Hu, Ming Yang, Xianggui Kong, Zhan Shi and Shouhua Feng
Crystal Growth & Design 2008 Volume 8(Issue 7) pp:2453-2457
Publication Date(Web):June 7, 2008
DOI:10.1021/cg800034z
Using hydrothermal synthesis, a series of indium iodates α-K3In(IO3)6 (1), β-K3In(IO3)6(2), In(OH)(IO3)2·H2O (3), and In(IO3)3 (4) from zero-dimensional, one-dimensional, to two-dimensional have been prepared. Compound 1 crystallizes in an orthorhombic system with space group Fdd2, a = 39.596(7) Å, b = 8.2984(14) Å, c = 11.258(2) Å, V = 3699.1(11) Å3. Compounds 2, 3, and 4 are obtained in the same reaction reagents with different pH values. At a pH value of 0.5, compound 2 is formed, which crystallizes in a triclinic system with space group P1̅, a = 6.9441(14) Å, b = 7.0685(14) Å, c = 10.639(12) Å, α = 98.14(3)°, β = 108.77(3)°, γ = 102.72(3)°, V = 469.4(20) Å3. The increase of pH value to 1.5 gives rise to compound 3, which crystallizes in a triclinic system with space group P1̅, a = 6.7321(13) Å, b = 7.5255(15) Å, c = 7.6798(15) Å, α = 100.43(3)°, β = 91.96(3)°, γ = 106.64(3)°, V = 365.09(12) Å3. When the pH value is further raised to 3, compound 4 is obtained in high yield (about 90% based on indium). The structure of compound 1 is made up of zero-dimensional units consisting of [In(IO3)6]3− anions separated by K+ cations. The indium centers are ligated by six monodentate iodate anions, of which the terminal oxygen atoms form long ionic contacts with K+ cations. Distinctively, compound 1 crystallizes in the polar space group Fdd2. The polarity in the structure is imparted by the alignment of the stereochemically active lone pairs of electrons of the iodate anions along the c-axis. Second-harmonic generation of 532 nm light from a 1064 nm laser source yields a response approximately similar to that of KDP. The same reaction stoichiometric undergoes pH-mediated structural transformation leading to the formation of zero-dimensional compound 2, one-dimensional compound 3, and two-dimensional compound 4. Compound 2 is also composed of [In(IO3)6]3− anions separated by K+ cations but is nonpolar. Compound 3 displays a one-dimensional ribbon structure constructed from [InO6] octahedra and [IO3] pyramids and separated by water molecules. [InO6] octahedra share corners to form a chain, of which two sides are decorated by [IO3] pyramids by bridging the adjacent octahedra. Compound 4 is known to contain Te4O9-type structure, in which iodate anions bridge In3+ cations to form two-dimensional layers. The reaction conditions and thermal stabilities of these compounds are investigated.
Co-reporter:Minghui Bi;Guanghua Li;Jia Hua;Yingjie Lin;Junjun Cao, ;Shouhua Feng
European Journal of Inorganic Chemistry 2008 Volume 2008( Issue 7) pp:1035-1038
Publication Date(Web):
DOI:10.1002/ejic.200701126
Abstract
The design and synthesis of coordination polymers from transition metals and organic ligands have been extensively studied for their crystallographic diversity and potential applications. Recently, the synthesis of coordination polymers by hydro(solvo)thermal in situ metal/ligand reactions has drawn great interest because of its potential to generate novel coordination architectures and new organic reactions. As described in our manuscript, the nitrogen heterocyclic 2,3-dihydroimidazo[1,2-a]pyrimidine (C6H7N3) ligand was synthesized by an in situ reaction starting from 2-aminopyrimidine and ethanol. At the same time, two luminescent copper halide coordination polymers, (CuCl)3C6H7N3 and (CuI)2C6H7N3, were assembled under solvothermal conditions. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Co-reporter:Xiaomin Liu;Guanghua Li;Bin Hu;Yang Yu;Yawei Hu;Minghui Bi, ;Shouhua Feng
European Journal of Inorganic Chemistry 2008 Volume 2008( Issue 16) pp:2522-2529
Publication Date(Web):
DOI:10.1002/ejic.200800058
Abstract
Four inorganic-organic hybrid compounds with the formulae In2(IO3)6(H2O)(2,2′-bipy)·H2O (1), In2(IO3)6(H2O)(1,10-phen)·H2O (2), Ga(IO3)3(2,2′-bipy)·HIO3 (3) and Ga(IO3)3(1,10-phen)·H2O (4) were hydrothermally synthesised at 100 °C over 7 d and subsequently characterised by single-crystal X-ray diffraction. The bidentate diamine ligands 2,2′-bipy and 1,10-phen in the In/I/O system give rise to the compounds In2(IO3)6(H2O)(2,2′-bipy)·H2O and In2(IO3)6(H2O)(1,10-phen)·H2O which crystallise in the monoclinic space group P21/c. Using the same bidentate diamine ligands, namely 2,2′-bipy and 1,10-phen, in the Ga/I/O system led to the formationof Ga(IO3)3(2,2′-bipy)·HIO3 and Ga(IO3)3(1,10-phen)·H2O which crystallise in the monoclinic space group P21/n. Both, In2(IO3)6(H2O)(2,2′-bipy)·H2O and In2(IO3)6(H2O)(1,10-phen)·H2O possess 2D layered structures, with the former consisting of [In(H2O)(IO3)5]2– clusters and [In(IO3)(2,2′-bipy)]2+ chains and the latter consisting of [In(H2O)(IO3)5]2– clusters and [In(IO3)(1,10-phen)]2+ chains. Compound Ga(IO3)3(2,2′-bipy)·HIO3 is a 1D ribbon built up from [IO3] pyramids, [GaO4N2] octahedra and distinct [I2O6] units and featuring interesting left and right helical chains. Compound Ga(IO3)3(1,10-phen)·H2O has a 1D chain-like structure constructed from the alternation of [GaO4N2] octahedra and [IO3] pyramids. By comparatively studying the photoluminescence properties of these compounds, we may conclude that the photoluminescence originates from ligand-centred π-π* transitions. The synthesised products were further characterised by powder X-ray diffraction, thermogravimetric analysis, IR spectroscopy, ICP and elemental analysis.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Co-reporter:Di Li ; Wenjun Dong ; Shangmei Sun ; Zhan Shi ;Shouhua Feng
The Journal of Physical Chemistry C 2008 Volume 112(Issue 38) pp:14878-14882
Publication Date(Web):August 28, 2008
DOI:10.1021/jp800318k
We have investigated an application of TiO2 photocatalyst sensitized with meso-tetra (4-carboxyphenyl) porphyrin (H2TPPC) or meso-tetra (4-nitrophenyl) porphyrin (TNO2PP) to degrade acid chrome blue K (ACBK) under visible light irradiation. By injecting electrons from the photoexcited sensitizer to the conduction band, the sensitized TiO2 degraded acid chrome blue K under incandescent lamp irradiation. The results indicated that H2TPPC−TiO2 had remarkable effects on the photodegradation of ACBK under natural sunlight (NSL) irradiation. The initial concentration of ACBK of 10 mg/L gave the decolorization rate of ACBK under incandescent lamp irradiation up to 94% in 15 min. This confirms that the H2TPPC−TiO2 composite could fully decompose ACBK under artificial light and that this process was accelerated under NSL. All facts suggest that H2TPPC−TiO2 in the heterogeneous photocatalysis phase has a potential application in wastewater treatment by using NSL.
Co-reporter:Dan Liu, Ping Zhang, Jianing Xu, Shouhua Feng, Zhan Shi
Solid State Sciences 2007 Volume 9(Issue 1) pp:16-20
Publication Date(Web):January 2007
DOI:10.1016/j.solidstatesciences.2006.10.003
A new molybdenum complex (C4H12N2)2[(MoV2O4)(MoVIO4)(C2O4)2]·2H2O, was solvothermally synthesized and characterized by single-crystal X-ray diffraction. The structure of the compound consists of oxalate acid-coordinated mixed-valent [MoV2O4][MoVIO4] helical chains and protonated piperazine cations. The helical chains are built up from the [MoV2O4] units and [MoVIO4] tetrahedral. The central axis about helical chain is a 2-fold screw axis. The compound crystallizes in the space group P21/n of monoclinic system with a = 11.396(2) Å, b = 14.107(3) Å, c = 15.805(3) Å, β = 102.09(3)°, V = 2484.6(9) Å3, Z = 4. Other characterizations by elemental analysis, IR, and thermal analysis for this compound are also given.A molybdenum complex (C4H12N2)2[(MoV2O4)(MoVIO4)(C2O4)2]·2H2O, was solvothermally synthesized and characterized by single-crystal X-ray diffraction. The structure of the compound consists of oxalate acid-coordinated mixed-valent [MoV2O4][MoVIO4] helical chains and protonated piperazine cations.
Co-reporter:Huijuan Yue, Dong Zhang, Zhan Shi, Shouhua Feng
Inorganica Chimica Acta 2007 Volume 360(Issue 8) pp:2681-2685
Publication Date(Web):30 May 2007
DOI:10.1016/j.ica.2007.01.004
Two dinuclear oxovanadium(IV) compounds [V(O)(NMet)(μ-OMe)]2 · MeOH (1) and [V(O)(NThr)(μ-OMe)]2 · MeOH (2) were prepared by the reaction of VOSO4 and ONN donor ligands, HNMet and HNThr (HNMet =N-(2-pyridylmethyl)-dl-methionine, HNThr = N-(2-pyridylmethyl)-dl-threonine) derived from 2-pyridinecarbaldehyde and dl-methionine/dl-threonine. Both of these compounds are characterized by single crystal X-ray diffraction. X-ray crystallography revealed that the two vanadium(IV) compounds are both dinuclear structures bridged by methanol groups. Each vanadium atom is six coordinated in a distorted octahedral environment. IR spectroscopy and EPR spectra for these two compounds are also given.Two dinuclear oxovanadium(IV) compounds [V(O)(NMet)(μ-OMe)]2 · MeOH (1) and [V(O)(NThr)(μ-OMe)]2 · MeOH (2) were prepared by the reaction of VOSO4 and designed amino acid derivatives ligands. The dimers were found to contain a planar [(OV)2O2] core consisting of methoxy-bridged trans-oxovanadium(IV) moieties. The ligands complete the distorted octahedral sphere of each oxovanadium(IV) moiety.
Co-reporter:Lei Wang, Hong Ding, Ying Hou, Linlin Zhu, Zhan Shi, Shouhua Feng
Journal of Solid State Chemistry 2006 Volume 179(Issue 8) pp:2584-2588
Publication Date(Web):August 2006
DOI:10.1016/j.jssc.2006.04.008
Employing 3-dimethylamino-1-propylamine as a template, a new three-dimensional (3-D) zincophosphite (C5H16N2)·[Zn3(HPO3)4]·H2O has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction (XRD), FTIR, elemental analysis, powder XRD, and thermogravimetric analysis (TGA). The compound crystallizes in the triclinic space group P1¯, with cell parameters, a=8.9884(2) Å, b=10.326(2) Å, c=11.917(2) Å, α=66.98(3)°, β=89.01(3)°, and γ=78.98(3)°, V=997.2(3) Å3 and Z=2. The connectivity of the ZnO4 tetrahedra and HPO3 pseudo pyramids results in inifinite edge-sharing, ladderlike chains of 4-membered rings, which are further linked by Zn–O–P bonds to form a 3-D structure that with interesting 12-membered ring channels along the [100] and [001] directions. The diprotonated amine molecules sit in the middle of the channels along the [100] direction and interact with the framework via hydrogen bonds. There also exist channels with 8-membered ring window along the [100] and [010] directions.View of the 3-D structure along the a-axis.
Co-reporter:Dingxuan Ma, Baiyan Li, Kang Liu, Xianlong Zhang, Weijian Zou, Yongquan Yang, Guanghua Li, Zhan Shi and Shouhua Feng
Journal of Materials Chemistry A 2015 - vol. 3(Issue 46) pp:NaN23142-23142
Publication Date(Web):2015/10/06
DOI:10.1039/C5TA07026K
We reported herein a strategy for combining CUS-based MOF (CUS = coordinatively unsaturated metal sites) with ionic liquid (IL) functional sites to form bifunctional heterogeneous catalysts with extra high activity for CO2 fixation. Based on this strategy, two quaternary ammonium salt and quaternary phosphorus salt ionic liquid functionalized CUS-containing MOF heterogeneous catalysts, MIL-101-N(n-Bu)3Br and MIL-101-P(n-Bu)3Br, have been prepared for the first time by a post-synthesis modification method. Due to the synergetic role of dual functional sites including Lewis acid sites in the MOF framwork and Br− ions in the IL functional sites, MIL-101-N(n-Bu)3Br and MIL-101-P(n-Bu)3Br exhibit high catalytic activity for the cycloaddition of CO2 and epoxide under mild and co-catalyst free conditions, which significantly outperforms other benchmark MOF catalysts. Moreover, such bifunctional catalysts can be easily recovered and recycled several times without leaching and loss of activity. Our work thus paves a way for the development of IL functionalized MOFs as heterogeneous catalysts for CO2 fixation.
Co-reporter:Ying Zhao, Chunguang Li, Feifei Li, Zhan Shi and Shouhua Feng
Dalton Transactions 2011 - vol. 40(Issue 3) pp:NaN588-588
Publication Date(Web):2010/12/01
DOI:10.1039/C0DT01198C
Highly water-dispersible Mn3O4 nanocrystals with well-controlled size, size distribution and high crystallinity have been successfully synthesized through a modified polyol process. Poly(acrylic acid) is used as the capping agent, conferring upon the particles high water-dispersion, of which the carboxylate groups partially bind to the nanocrystal surface and the uncoordinated carboxylate groups extend into water. The water-dispersible Mn3O4 nanocrystals can be further transferred to nonpolar solvent by linking oleylamine molecules through electrostatic interaction. The as-prepared Mn3O4 nanocrystals exhibit ferromagnetic behavior at low temperature and weak paramagnetic behavior at room temperature. The Curie–Weiss temperature and the blocking temperature are 40 K and 32 K, respectively.
Co-reporter:Fen Yang, Qi Zhou, Guang Zeng, Guanghua Li, Lu Gao, Zhan Shi and Shouhua Feng
Dalton Transactions 2014 - vol. 43(Issue 3) pp:NaN1245-1245
Publication Date(Web):2013/10/21
DOI:10.1039/C3DT52634H
Here we report the anion-induced changes of structures and magnetic properties in binuclear lanthanide compounds. Firstly, two Dy3+-based compounds, [Dy2(Mq)4(NO3)6] (1) and [Dy2(Mq)4Cl6](EtOH)2 (2) (Mq = 8-hydroxy-2-methylquinoline), were synthesized and characterized. They contain similar binuclear Dy2O2 cores, while the different peripheral anions lead to quite different coordination environments of the Dy3+ ion. In compound 1, the Dy3+ ion is nine-coordinated and characterized by a distorted 4,4,4-tricapped trigonal prism environment. In compound 2, the Dy3+ ion has a highly distorted six-coordinated octahedral environment. Their Gd3+ analogues, [Gd2(Mq)4(NO3)6] (3) and [Gd2(Mq)4Cl6](EtOH)2 (4), were also studied to investigate the magnetic interaction between metal ions. Variable-temperature dc magnetic susceptibility measurements show that all the compounds are weakly antiferromagnetically coupled. Ac magnetic susceptibility measurements reveal that both compounds 1 and 2 exhibit single-molecule magnet (SMM) behaviour, while the thermal energy barrier of 2 is significantly higher than that of 1 (Δ/kB = 40.0 K for 1 and Δ/kB = 102.4 K for 2).
Co-reporter:Chunguang Li, Feifei Li, Tao Li, Tianyu Bai, Long Wang, Zhan Shi and Shouhua Feng
Dalton Transactions 2012 - vol. 41(Issue 16) pp:NaN4895-4895
Publication Date(Web):2012/03/08
DOI:10.1039/C2DT30064H
Water-dispersible Re3+ doped CeF3 colloidal nanocrystals with well controllable morphology and high crystallinity have been successfully synthesized through a solvothermal process. The TEM images illustrate that the Re3+ doped CeF3 nanocrystals are rectangular (or cubic) with a mean diameter of ∼10 nm. The excellent dispersibility in some of the polar solvents including water is achieved by using polyethyleneimine as the capping agent. The amine groups of the polymer chains on one hand bind to the nanocrystal surface; on the other hand the free ones could link to functional materials including bio-molecules. The CeF3 nanocrystals doped with Tb3+ and Dy3+ ions show the characteristic emission of Tb3+ 5D4–7FJ (J = 6–3, with 5D4–7F5 green emission at 542 nm as the strongest one) and Dy3+ 4F9/2–6H15/2 (blue-green color at 478 nm) and 4F9/2–6H13/2 (yellow color at 571 nm) transitions, respectively. The energy transfer from Ce3+ to Tb3+ and Dy3+ was also investigated in detail. In vitro studies of Re3+ doped CeF3 colloidal nanocrystals on HepG2 cells confirm their excellent biological compatibility. The obtained solid CeF3:Tb3+/PDMS nanocomposites are very stable and flexible and exhibit strong green photoluminescence upon UV excitation.
Co-reporter:Feifei Li, Chunguang Li, Xiaomin Liu, Tianyu Bai, Wenjun Dong, Xiao Zhang, Zhan Shi and Shouhua Feng
Dalton Transactions 2013 - vol. 42(Issue 6) pp:NaN2022-2022
Publication Date(Web):2012/11/23
DOI:10.1039/C2DT32295A
Monodisperse water-soluble LaF3:Ln3+ nanocrystals (NCs) have been successfully fabricated via a fast, facile and environmentally-friendly microwave-assisted modified polyol process with polyvinylpyrrolidone (PVP) as an amphiphilic surfactant. The obtained NCs can be well dispersed in hydrophilic solutions with small sizes in the range of 9–12 nm. The LaF3:Ln3+ NCs (Ln = Eu, Nd, Ce, Tb, Yb, Er, Yb, Ho and Yb, Tm) have the unique feature of up–down conversion from visible to NIR emission owing to the ladder-like arranged energy levels of Ln3+ and in particular, the high efficiency upconversion of the two-photon, obtained from excitation by a continuous 980 nm laser. This investigation focuses on both the up and down conversion fluorescence properties of water-soluble monodisperse crystalline LaF3:Ln3+ NCs in such a small size. Furthermore, the three-dimensional PDMS rod-like fluorescence displays and a silica surface modification by a core/shell structure on the obtained NCs can improve the biocompatibility, indicating potential applications in optical 3D devices and as bio-probes.
Co-reporter:Qi Zhou, Fen Yang, Dan Liu, Yu Peng, Guanghua Li, Zhan Shi and Shouhua Feng
Dalton Transactions 2013 - vol. 42(Issue 4) pp:NaN1046-1046
Publication Date(Web):2012/10/31
DOI:10.1039/C2DT31050C
A family of 3d–4f heterometallic compounds [Na2FeIII6DyIII2(N3)4(HL)4(CH3O)4(PhCO2)6] (1, H4L = 2-{[(2-hydroxy-3-methoxyphenyl)methylene]amino}-2-(hydroxymethyl)-1,3-propanediol), [Na2FeIII6DyIII2(N3)4(L′)4(CH3O)4(PhCO2)6(H2O)] (2, H3L′ = (E)-2-ethyl-2-(2-hydroxy-3-methoxybenzylideneamino)propane-1,3-diol), [Na2FeIII6DyIII2(N3)4(L′)4(CH3O)4(ButCO2)6] (3) [Na2FeIII6YIII2(N3)4(L′)4(CH3O)4(PhCO2)6(H2O)] (4), and [Na2FeIII6GdIII2(N3)4(L′)4(CH3O)4(PhCO2)6(CH3OH)2] (5) have been prepared using Schiff-base ligands, trinuclear iron precursor complexes, azides and lanthanide nitrates as reactants. In compounds 1 and 2, the structure of the [Na2FeIII6DyIII2] cluster forms a couple of cis,trans-isomers with substitution of methyl for a free hydroxyl group which belongs to the Schiff-base ligand. When the pivalates are employed instead of bulkier benzoates, the trans-[Na2FeIII6DyIII2] clusters act as network nodes in the formation of rhombic grid-like layered structures in compound 3. Compounds 2, 4 and 5 have similar metallic cores, only with different crystal solvent molecules. The magnetic measurements on all the compounds indicate dominant antiferromagnetic interactions between the metal centers.
Co-reporter:Dingxuan Ma, Baiyan Li, Xiaojing Zhou, Qi Zhou, Kang Liu, Guang Zeng, Guanghua Li, Zhan Shi and Shouhua Feng
Chemical Communications 2013 - vol. 49(Issue 79) pp:NaN8966-8966
Publication Date(Web):2013/08/05
DOI:10.1039/C3CC44546A
We report here a luminescent metal–organic framework [Zn3(TDPAT)(H2O)3] [TDPAT = 2,4,6-tris(3,5-dicarboxyl phenylamino)-1,3,5-triazine] exhibiting strong luminescence at room temperature, which can serve as the first case of a dual functional luminescent sensor for quantitatively detecting the concentration of nitrobenzene and temperature.
Co-reporter:Qi Zhou, Fen Yang, Bingjing Xin, Guang Zeng, Xiaojing Zhou, Kang Liu, Dingxuan Ma, Guanghua Li, Zhan Shi and Shouhua Feng
Chemical Communications 2013 - vol. 49(Issue 74) pp:NaN8246-8246
Publication Date(Web):2013/07/17
DOI:10.1039/C3CC43747G
The reversible sorption–desorption of terminal coordinated water molecules and the guest molecules can switch slow magnetic relaxation in a classic lanthanide metal–organic framework system, Dy(BTC)(H2O)·DMF and Dy(BTC).
Co-reporter:Kang Liu, Baiyan Li, Yi Li, Xu Li, Fen Yang, Guang Zeng, Yu Peng, Zhijuan Zhang, Guanghua Li, Zhan Shi, Shouhua Feng and Datong Song
Chemical Communications 2014 - vol. 50(Issue 39) pp:NaN5033-5033
Publication Date(Web):2014/03/25
DOI:10.1039/C4CC00375F
We report the storage capacities and separation selectivity of an rht-type s-heptazine-based metal organic framework (MOF), [Cu3(TDPAH)(H2O)3]·13H2O·8DMA, 1, (where TDPAH is 2,5,8-tris(3,5-dicarboxylphenylamino)-s-heptazine and DMA is N,N-dimethylacetamide) for C2 hydrocarbons and CO2 over CH4. MOF 1 displays the highest C2H2/CH4 selectivity of 80.9 as well as record high C2H4 and C2H6 adsorption enthalpies. Theoretical calculations reveal that s-heptazine and NH groups within the framework have synergistic effects on CO2 binding.
Co-reporter:Fen Yang, Qi Zhou, Yiquan Zhang, Guang Zeng, Guanghua Li, Zhan Shi, Bingwu Wang and Shouhua Feng
Chemical Communications 2013 - vol. 49(Issue 46) pp:NaN5291-5291
Publication Date(Web):2013/04/23
DOI:10.1039/C3CC00277B
We have investigated the dynamics of the magnetization of three four-coordinate mononuclear cobalt(II) compounds, which are synthesized conveniently and are air stable. Slow magnetic relaxation effects were observed for the compounds in the presence of a dc magnetic field.
Co-reporter:Baiyan Li, Yiming Zhang, Dingxuan Ma, Lu Li, Guanghua Li, Guodong Li, Zhan Shi and Shouhua Feng
Chemical Communications 2012 - vol. 48(Issue 49) pp:NaN6153-6153
Publication Date(Web):2012/04/25
DOI:10.1039/C2CC32384B
A new strategy toward constructing bifunctionalized MOFs has been developed based on post-synthetic modification of MOFs on organic ligands and coordinatively unsaturated metal sites, respectively. Based on this strategy, an organo-bifunctionalized MOF catalyst has been synthesized for the first time and successfully applied in one-pot tandem reaction.
Co-reporter:Bingjing Xin, Guang Zeng, Lu Gao, Yun Li, Shanghua Xing, Jia Hua, Guanghua Li, Zhan Shi and Shouhua Feng
Dalton Transactions 2013 - vol. 42(Issue 21) pp:NaN7568-7568
Publication Date(Web):2013/03/13
DOI:10.1039/C3DT50238D
A copper(I) halide-based compound with a formula of [Cu4I3(DABCO)2]I3 (DABCO = N,N′-dimethyl-1,4-diazabicyclo[2.2.2]octane) has been prepared by solvothermal reactions. This compound has been characterized by single-crystal X-ray diffraction, elemental analysis, IR, TG, XPS and powder X-ray diffractions. Structure analyses reveal that this compound is constructed by unprecedented cationic cluster [Cu8I6]2+ and organic ligand DABCO and the channels of this compound are occupied by I2 and I−. The guest I2 and I− can move freely in and out of the host-framework. UV/vis spectra confirm that the I2 molecules in the channels can release into some organic solvents and IR spectra confirm the I− was exchanged by SCN−. In addition, the luminescent properties of this compound in the solid state have also been investigated.
Co-reporter:Baiyan Li, Fen Yang, Yiming Zhang, Guanghua Li, Qi Zhou, Jia Hua, Zhan Shi and Shouhua Feng
Dalton Transactions 2012 - vol. 41(Issue 9) pp:NaN2684-2684
Publication Date(Web):2012/01/12
DOI:10.1039/C1DT11654A
Eight 2D and 3D coordination polymers, [Mn(NBPDC)(1,4-bimb)]n (1), [Zn(NBPDC)(1,4-bimb)]n (2), [Cd(NBPDC)(1,4-bimb)]n (3), [Mn2(NBPDC)2(1,3-bimb)(H2O)]n (4), {Zn(NBPDC)(1,3-bimb)}n (5), [Cd2(NBPDC)2(1,3-bimb)2(H2O)]n (6), [Mn(NBPDC)(4,4′-bimbp)]n (7), and [Cd2(NBPDC)2(4,4′-bimbp)2]n (8), (NBPDC = 2,2′-dinitro-4,4′-biphenyldicarboxyl acid, 1,4-bimb = 1,4-bis(imidazol-1-ylmethyl) benzene, 1,3-bimb = 1,3-bis(imidazol-1-ylmethyl) benzene, and 4,4′-bimbp = 4,4′-(bis(imidazol-l-ylmethylene)) biphenyl), have been prepared and structurally characterized. In these coordination polymers, NBPDC and three N-donor ligands link different metal ions and SBUs to construct diverse architectures. Compounds 1 and 3 are isomorphic, showing a two-fold interpenetrating pcu topology. Compound 2 presents a 2D (4, 4) net. Compound 4 is a hex framework built by the linkage of ligands with infinite rod-shaped SBUs. Compound 5 presents a unprecedented eight-fold interpenetrating sra topology. Compound 6 exhibits a unique 2D {63}{65.8} topology with four-fold interpenetrating structure. Compound 7 presents a 3D hex topology, and compound 8 shows a (4, 4) net. The magnetic properties of compounds 1, 4, and 7 have been characterized. Compound 1 displays interesting spin-canting antiferromagnetism and metamagnetism simultaneously. Compound 7 exhibits spin-canting antiferromagnetism.
Co-reporter:Dan Liu, Qi Zhou, Yan Chen, Fen Yang, Yang Yu, Zhan Shi and Shouhua Feng
Dalton Transactions 2010 - vol. 39(Issue 23) pp:NaN5508-5508
Publication Date(Web):2010/05/15
DOI:10.1039/C000731E
Reactions of MnX2 meltsalt (X = Cl and ClO4) and a quinquedentate Schiff base ligand together with its coligand azides in MeOH produced the unprecedented assembly of novel octa- and hexadecanuclear manganese clusters containing two and four alternant tetrahedral MnIII3MnII cores bridged by Schiff base ligands and versatile azides groups. The magnetic measurements on both compounds indicate dominant antiferromagnetic interactions between the metal centers. This synthetic approach may suggest a promising pathway to the design of novel Schiff base-based polynuclear manganese clusters and novel magnetic materials.
Co-reporter:Kang Liu, Dingxuan Ma, Baiyan Li, Yi Li, Kexin Yao, Zhijuan Zhang, Yu Han and Zhan Shi
Journal of Materials Chemistry A 2014 - vol. 2(Issue 38) pp:NaN15828-15828
Publication Date(Web):2014/08/08
DOI:10.1039/C4TA03656E
We report on the storage capacity and separation selectivity of an rht-type metal–organic framework, Cu–TDPAT [TDPAT = 2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazine], for C2 hydrocarbons over CH4. Henry's constant, the isosteric heat of adsorption and the ideal adsorbed solution theory selectivity were calculated based on single-component sorption isotherms. Theoretical calculations indicate that both the open metal sites and the Lewis basic sites have strong interactions with the C2 molecules. The combination of these two kinds of sites lead to the highest C2H2–CH4 selectivity of 127.1 as well as record high values for C2H4 adsorption enthalpies. To mimic real-world conditions, breakthrough experiments were conducted on an equimolar four-component mixture containing C2H2, C2H4, C2H6 and CH4 at room temperature and 1 atm pressure. Our results show that Cu–TDPAT is a promising candidate for CH4 capture and purification.
![[1,1'-BIPHENYL]-2-OL, 3-(3,4-DIPHENYL-1,3-CYCLOPENTADIEN-1-YL)-](http://img.cochemist.com/ccimg/591300/591245-24-8.png)
![[1,1'-BIPHENYL]-2-OL, 3-(3,4-DIPHENYL-1,3-CYCLOPENTADIEN-1-YL)-](http://img.cochemist.com/ccimg/591300/591245-24-8_b.png)
![1H-Imidazole, 1,1'-[1,3-phenylenebis(methylene)]bis-](/data/chemimg/2348600/69506-92-9.png)
![1H-Imidazole, 1,1'-[1,3-phenylenebis(methylene)]bis-](/data/chemimg/2348600/69506-92-9_b.png)
![Zincate(4-),[29H,31H-phthalocyanine-C,C,C,C-tetrasulfonato(6-)-kN29,kN30,kN31,kN32]-, hydrogen (1:4)](http://img.cochemist.com/ccimg/61600/61586-86-5.png)
![Zincate(4-),[29H,31H-phthalocyanine-C,C,C,C-tetrasulfonato(6-)-kN29,kN30,kN31,kN32]-, hydrogen (1:4)](http://img.cochemist.com/ccimg/61600/61586-86-5_b.png)
![Imidazo[1,2-a]pyrimidine, 2,3-dihydro- (9CI)](http://img.cochemist.com/ccimg/53700/53601-85-7.png)
![Imidazo[1,2-a]pyrimidine, 2,3-dihydro- (9CI)](http://img.cochemist.com/ccimg/53700/53601-85-7_b.png)
![Tungstate(3-),tetracosa-m-oxododecaoxo[m12-[phosphato(3-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-,hydrogen (1:3)](http://img.cochemist.com/ccimg/1400/1343-93-7.png)
![Tungstate(3-),tetracosa-m-oxododecaoxo[m12-[phosphato(3-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-,hydrogen (1:3)](http://img.cochemist.com/ccimg/1400/1343-93-7_b.png)
![1,3-Dioxolan-2-one, 4-[(2-propen-1-yloxy)methyl]-](/data/chemimg/2314900/826-29-9.png)
![1,3-Dioxolan-2-one, 4-[(2-propen-1-yloxy)methyl]-](/data/chemimg/2314900/826-29-9_b.png)
![Poly[(8-amino-1,3,4,6,7,9,9b-heptaazaphenalene-2,5-diyl)imino]](http://img.cochemist.com/ccimg/32600/32518-77-7.png)
![Poly[(8-amino-1,3,4,6,7,9,9b-heptaazaphenalene-2,5-diyl)imino]](http://img.cochemist.com/ccimg/32600/32518-77-7_b.png)
![[1,1'-Biphenyl]-4,4'-dicarboxylic acid, 2,2'-dinitro-](/data/chemimg/61700/41725-30-8.png)
![[1,1'-Biphenyl]-4,4'-dicarboxylic acid, 2,2'-dinitro-](/data/chemimg/61700/41725-30-8_b.png)
