Co-reporter:Xiaohui Zhang;Peng Li;Xinyang Liu;Tianjun Yu;Dushan Zhang;Jinping Chen;Yi Zeng;Jun Liu;Yi Li
Langmuir April 21, 2015 Volume 31(Issue 15) pp:4386-4393
Publication Date(Web):2017-2-22
DOI:10.1021/acs.langmuir.5b00155
The highly emissive nanoparticles Gn-TCMPE (n = 0–4) were prepared by using PAMAM dendrimers as “molecular glue” to adhere an AIE-active molecule tetra(4-(carboxymethoxy)phenyl)ethylene (TCMPE). The electrostatic interaction of ammonium–carboxylate ion pairs provides a driving force between TCMPE and PAMAM dendrimers to form the nanoparticles Gn-TCMPE (n = 0–4), which is validated by the FTIR and 1H NMR spectra. The formation of nanoparticles dramatically blocks the nonradiative pathway and enhances the fluorescence of TCMPE. The quantum yields of Gn-TCMPE gradually boost at first and then reach to a plateau with increasing the generation of PAMAM dendrimers, and the highest absolute quantum yields are obtained to be 0.42 and 0.64 for Gn-TCMPE (n = 2–4) in methanol dispersion and solid phases, respectively. The fluorescence of the nanoparticles can be tuned by addition of trifluoroacetic acid (TFA). Furthermore, the G4-TCMPE has been successfully applied to selectively image cytoplasm of Hela cells with excellent photostability and low cytotoxicity. This study provides a novel noncovalent strategy for developing highly emissive and robust organic materials fitting for cell fluorescence imaging.
Co-reporter:Haining Li;Liucheng Chen;Xiang Zhu;Zheng Wang
Journal of Solution Chemistry 2017 Volume 46( Issue 1) pp:3-10
Publication Date(Web):2017 January
DOI:10.1007/s10953-016-0546-y
A potential new use of room temperature ionic liquid for a pressure transmitting medium is introduced in detail. A systematic study of the pressure-induced solidification of 1-butyl-3-methylimidazolium tetrafluoroborate ([C4MIM][BF4]) is presented in a diamond anvil cell at pressures up to 30 GPa by combining ruby fluorescence and synchrotron X-ray diffraction measurements. Its hydrostatic properties have been determined with hydrostatic limit up to about 6 GPa, and a slight pressure gradient was found up to 21 GPa. These results indicate that this kind of ionic liquid is a good hydrostatic pressure transmitting medium.
Co-reporter:Jun Liu;Shilu Zhang;Chenghua Zhang;Jun Dong;Chengyi Shen;Jiang Zhu;Huajun Xu;Mingkai Fu;Xiaoming Zhang
Chemical Communications 2017 vol. 53(Issue 83) pp:11476-11479
Publication Date(Web):2017/10/17
DOI:10.1039/C7CC06045A
By functionalizing triarylboron with cyclen, we developed a two-photon fluorescence probe, TAB-2, which can selectively bind RNA with a ratiometric readout. We tested TAB-2 in NIH/3T3 fibroblast cells, and demonstrated its capability in visualizing nucleoli and analyzing microenvironment polarity by two-photon and fluorescence-lifetime imaging microscopy.
Co-reporter:Qiyun Fang;Jiewei Li;Shayu Li;Ruihong Duan;Shuangqing Wang;Yuanping Yi;Xudong Guo;Yan Qian;Wei Huang
Chemical Communications 2017 vol. 53(Issue 42) pp:5702-5705
Publication Date(Web):2017/05/23
DOI:10.1039/C7CC00551B
A series of air-stable triarylphosphine oxide-based thermosensitive ratiometric sensors based on local excited (LE) and charge transfer (CT) emissions have been designed and synthesized. The fluorescence intensity of tri(pyren-1-yl)phosphine oxide exhibits a prominent temperature-dependent feature over a wide temperature range due to thermally populated emissive LE states. The wide ratiometric temperature sensing range and high stability/reversibility in an ambient atmosphere indicate their great potentials in facile and practical applications.
Co-reporter:Jun Liu;Chenghua Zhang;Jun Dong;Jiang Zhu;Chengyi Shen;Xiaoming Zhang
New Journal of Chemistry (1998-Present) 2017 vol. 41(Issue 12) pp:4733-4737
Publication Date(Web):2017/06/12
DOI:10.1039/C7NJ00471K
By loading a triarylboron-based AIE Fluorophore, TNPB, on polyurethane nanogel (NG-TNPB), we achieved a ratiometric readout for sensing H2O2. PTBN-1-ol, produced by TNPB reacting with H2O2, can also make a sequential response for pH with the nanogel. We also applied NG-TNPB to detect H2O2 and provide a sequential response to pH in cells.
Co-reporter:Tao Zhang;Hua Yuan;Shuangqing Wang;Xudong Guo;Rui Hu;Yi Li
RSC Advances (2011-Present) 2017 vol. 7(Issue 52) pp:32861-32865
Publication Date(Web):2017/06/23
DOI:10.1039/C7RA03882H
Monolithic methylsilsesquioxane (MSQ) aerogels have been prepared from methyltrimethoxysilane (MTMS) via an ambient pressure drying (APD) method. Tetraethylammonium hydroxide (TEAH) was used to suppress macroscopic phase separation and accelerate the condensation reaction. The obtained hydrophobic MSQ aerogels are highly transparent and withstand exposure to aggressive media for extended periods of time. This novel anti-corrosion property can be further improved by chemical modification with POTS and PDTS.
Co-reporter:Tao Zhang;Hua Yuan;Shuangqing Wang;Xudong Guo;Rui Hu;Yi Li
RSC Advances (2011-Present) 2017 vol. 7(Issue 52) pp:32861-32865
Publication Date(Web):2017/06/23
DOI:10.1039/C7RA03882H
Monolithic methylsilsesquioxane (MSQ) aerogels have been prepared from methyltrimethoxysilane (MTMS) via an ambient pressure drying (APD) method. Tetraethylammonium hydroxide (TEAH) was used to suppress macroscopic phase separation and accelerate the condensation reaction. The obtained hydrophobic MSQ aerogels are highly transparent and withstand exposure to aggressive media for extended periods of time. This novel anti-corrosion property can be further improved by chemical modification with POTS and PDTS.
Co-reporter:Jun Liu;Chenghua Zhang;Jun Dong;Jiang Zhu;Chengyi Shen;Xiaoming Zhang
RSC Advances (2011-Present) 2017 vol. 7(Issue 24) pp:14511-14515
Publication Date(Web):2017/03/03
DOI:10.1039/C7RA00426E
A triarylboron-based AIE fluorophore, TAB-AIE-FL, was designed and synthesized by introducing an electron acceptor to boost charge separation, transforming its TICT state from bright emission to dark. We further introduced it into NIH/3T3 cells using nanogel as a carrier for imaging the intracellular environments of cytoplasm and nucleus.
Co-reporter:Xiang Zhu;Haining Li;Zheng Wang;Chaosheng Yuan;Pinwen Zhu;Lei Su;Kun Yang;Jie Wu;Xiaodong Li
RSC Advances (2011-Present) 2017 vol. 7(Issue 42) pp:26428-26433
Publication Date(Web):2017/05/15
DOI:10.1039/C7RA03921B
The phase behaviors of 1-dodecyl-3-methylimidazolium tetrafluoroborate ([C12MIM][BF4]) had been investigated by means of Raman spectroscopy and polarized optical microscopy under pressure values up to 2.0 GPa at the temperature of 80.0 °C. Upon compression, change in the ratio of peak heights of symmetric and asymmetric CH2 stretching modes of Raman spectra in [C12MIM][BF4] (r(CH2)ss/(CH2)as) indicated that it might experience two successive phase transitions. The structure evolution of the sample, which was investigated through the image analysis from polarized optical microscopy, was found to share many of the known quantitative properties of the smectic A phase of [C12MIM][BF4]. These facts were suggestive of ionic liquid crystal induced by compression in [C12MIM][BF4] under the pressure between 0.25 GPa to 0.60 GPa, which was similar to ionic liquid crystal upon cooling from its melt.
Co-reporter:Fengxian Lu;Rui Hu;Shuangqing Wang;Xudong Guo
RSC Advances (2011-Present) 2017 vol. 7(Issue 7) pp:4196-4202
Publication Date(Web):2017/01/09
DOI:10.1039/C6RA25369E
Three benzothiazole derivatives, N-[4-(benzothiazol-2-yl)-3-hydroxyphenyl]-octanamide (BHPO1), N-[3-(benzothiazol-2-yl)-4-hydroxyphenyl]-octanamide (BHPO2), N-[4-(benzothiazol-2-yl)phenyl]-octanamide (BPO) were prepared and their luminescence properties were investigated. These analogues show similar absorption maxima but quite different emission regions due to the existence of an excited-state intramolecular proton transfer (ESIPT) process in BHPO1 and BHPO2. Upon excitation with 365 nm light, BPO, BHPO1 and BHPO2 exhibit bright blue-violet, green and orange emission in aggregated states, respectively which perfectly make up the component elements of white light. By doping these compounds into a polymer matrix at a certain proportion, an emission that lies at the saturated white-light region with CIE chromaticity coordinates of (0.31, 0.32) was obtained. This study provides a flexible and simple fabrication process of a white-light emitting device using three structurally-similar compounds without detrimental energy transfer.
Co-reporter:Xiaoman Peng;Hua Yuan;Jian Xu;Fengxian Lu;Liangqian Wang;Xudong Guo;Shuangqing Wang;Shayu Li;Yi Li
RSC Advances (2011-Present) 2017 vol. 7(Issue 10) pp:5549-5553
Publication Date(Web):2017/01/16
DOI:10.1039/C6RA27074C
An easily-prepared probe/nanogel composite indicator HTBNM/PU was presented, which showed selective fluorescence responses to cysteine/homocysteine over glutathione both in vivo and in vitro based on the different hydrophilicity of these biothiols. In principle, this approach could endow any lipophilic thiol indicator with selectivity for sulfur-containing amino acids.
Co-reporter:Shuang Li, Rui Hu, Chenlin Yang, Xin Zhang, Yi Zeng, Shuangqing Wang, Xudong Guo, Yi Li, Xiaopin Cai, Shirui Li, Chengwu Han, Guoqiang Yang
Biosensors and Bioelectronics 2017 Volume 98(Volume 98) pp:
Publication Date(Web):15 December 2017
DOI:10.1016/j.bios.2017.06.059
•A bioluminogenic probe Glu-Luc was designed and synthesized by connecting D-luciferin with γ-glutamyl group.•The probe exhibits very high selectivity and sensitivity toward GGT activity from in vitro to in vivo and in clinical samples.•It offers a promising tool for investigations of the GGT-overexpressing related biological process including tumor diagnosis and prognosis in living organisms.Abnormal expression of γ-Glutamyltranspeptidase (GGT) in living organisms is closely implicated in the development of several human tumors. The GGT levels in tissue and serum have emerged as a potential criterion for tumor diagnosis. However, precise “light up” GGT activity in vivo is still challenging due to the signal interferes of background. Bioluminescence based on the firefly luciferase-catalyzed reaction for light production provides a feasible strategy for GGT detection in vivo. In this report, a bioluminogenic probe, Glu-Luc, was designed and synthesized by connecting D-luciferin with γ-glutamyl group. The cleavage of γ-glutamyl group is triggered by GGT, resulting in the release of D-luciferin, which generates a bright bioluminescence emission in the present of luciferase and ATP. The probe exhibits very high selectivity and sensitivity toward GGT activity from in vitro to in vivo and in clinical samples, which offers a promising tool for investigations of the GGT-overexpressing related biological process including tumor diagnosis and prognosis in living organisms.
Co-reporter:Jun Liu, Xudong Guo, Rui Hu, Xinyang Liu, Shuangqing Wang, Shayu Li, Yi Li, and Guoqiang Yang
Analytical Chemistry 2016 Volume 88(Issue 1) pp:1052
Publication Date(Web):December 4, 2015
DOI:10.1021/acs.analchem.5b04248
Hydrogen sulfide (H2S) is a multifunctional signaling molecule that participates in many important biological processes. Herein, by functionalizing triarylboron with cyclen and diphenylamine, we synthesized TAB-1, TAB-2, and TAB-3 for H2S recongnization by rational design of molecular structures. Among them, aqueous soluble TAB-2 possesses excellent properties, including large two-photon action cross section, membrane permeability and can effectively complex with Cu2+. The complex of TAB-2-Cu2+ can selectively detect H2S with an instant response and mitochondria targeted. Moreover, the H2S-induced finite aggregation of indicators enhances their photostability and causes variation of the fluorescence lifetime. TAB-2-Cu2+ has also been successfully applied for the mitochondria H2S imaging in NIH/3T3 fibroblast cells by TPM and FLIM.
Co-reporter:Zhiqing Xun, Tianjun Yu, Yi Zeng, Jinping Chen, Xiaohui Zhang, Guoqiang Yang and Yi Li
Journal of Materials Chemistry A 2015 vol. 3(Issue 24) pp:12965-12971
Publication Date(Web):12 May 2015
DOI:10.1039/C5TA02565F
A series of artificial photosynthesis complexes, Gn–Ir–Hy (n = 1–4), were constructed by attaching iridium complexes and [Fe–Fe]-hydrogenase mimic to the periphery and core, respectively, of poly(aryl ether) dendrimers of different generations. The iridium complexes act as the light-harvesting antennae and the hydrogenase mimic core is the catalytic center. Light-harvesting, photoinduced electron-transfer, and hydrogen photochemical production were hierarchically realized within the dendritic photosynthesis mimics using triethylamine as the sacrificial electron donor. The catalytic activity is enhanced as the generation of dendritic catalysts increases, and the turnover number for generation 4 is nearly 4 times more than that of generation 1. The peripheral antennae not only harvest photons but also act as electronic energy reservoirs for the photochemical production, which facilitates the catalytic process together with the increased light-harvesting and protection effects of dendritic frameworks. Therefore, efficient artificial photosynthesis systems with complete light-harvesting and catalytic functions can be advanced with such rational design.
Co-reporter:Lixia Cao, Zhensheng Zhao, Tao Zhang, Xudong Guo, Shuangqing Wang, Shayu Li, Yi Li and Guoqiang Yang
Chemical Communications 2015 vol. 51(Issue 97) pp:17324-17327
Publication Date(Web):06 Oct 2015
DOI:10.1039/C5CC07118F
The pH of mitochondria (pHm) has a close relationship with many biological processes. Here we developed a new indicator Mito-pH-1 for the ratiometric fluorescence detection of the mitochondria pH value, which has excellent tolerance to environmental change. And Mito-pH-1 has been used for the first time to monitor the change of pHm under temperature and H2O2 stimuli in living cells.
Co-reporter:Jun Liu, Xudong Guo, Rui Hu, Jian Xu, Shuangqing Wang, Shayu Li, Yi Li, and Guoqiang Yang
Analytical Chemistry 2015 Volume 87(Issue 7) pp:3694
Publication Date(Web):March 10, 2015
DOI:10.1021/acs.analchem.5b00887
A novel hydrophilic fluorescence temperature probe (PNDP) based on polarity-sensitive triarylboron compound (DPTB) and PNIPAM is designed and synthesized. In order to overcome the shortcomings of the single-intensity-based sensing mechanism and obtain more robust signals, ratiometric readout is achieved by designing an efficient FRET system (PNDP-NR) between DPTB and Nile Red (NR). PNDP-NR possesses some excellent features, including wide temperature range, good linear relationship, high temperature resolution, excellent reversibility, and stability. Within a sensing temperature range of 30–55 °C, the fluorescence color of PNDP-NR experiences significant change from red to green-blue. PNDP-NR is also introduced into NIH/3T3 cells to sense the temperature at the single-cell level. It gave excellent photostability and low cytotoxicity in vivo.
Co-reporter:Xudong Guo, Xin Zhang, Shuangqing Wang, Shayu Li, Rui Hu, Yi Li, Guoqiang Yang
Analytica Chimica Acta 2015 Volume 869() pp:81-88
Publication Date(Web):15 April 2015
DOI:10.1016/j.aca.2015.02.023
•A novel “turn-on” two-photon fluorescent probe based on a π-conjugated triarylboron luminogen was designed and synthesized.•Fast, selective and sensitive detection of biothiols in 100% aqueous solution by simply loaded on a nanogel.•Single-photon and two-photon fluorescent bioimaging of biothiols in NIH/3T3 fibroblasts.A novel “turn-on” two-photon fluorescent probe containing a π-conjugated triarylboron luminogen and a maleimide moiety DMDP-M based on the photo-induced electron transfer (PET) mechanism for biothiol detection was designed and synthesized. By simply loading the hydrophobic DMDP-M on a cross-linked Pluronic® F127 nanogel (CL-F127), a probing system DMDP-M/CL-F127 was established, which shows quick response, high selectivity and sensitivity to cysteine (Cys), homocysteine (Hcy) and glutathione (GSH) in aqueous phase. The DMDP-M/CL-F127 system presented the fastest response to Cys with a rate constant of 0.56 min−1, and the detection limit to Cys was calculated to be as low as 0.18 μM. The DMDP-M/CL-F127 system has been successfully applied to the fluorescence imaging of biothiols in NIH/3T3 fibroblasts either with single-photon or two-photon excitation because of its high biocompatibility and cell-membrane permeability. The present work provides a general, simple and efficient strategy for the application of hydrophobic molecules to sensing biothiols in aqueous phase, and a novel sensing system for intracellular biothiols fitted for both single-photon and two-photon fluorescence imaging.
Co-reporter:Yufen Ren, Haining Li, Xiang Zhu, Liucheng Chen, Lei Su, Kun Yang, Guoqiang Yang, Hua Wang
Chemical Physics Letters 2015 Volume 629() pp:8-12
Publication Date(Web):1 June 2015
DOI:10.1016/j.cplett.2015.04.010
•Amorphization and conformational equilibrium of [HMIM][PF6] have been investigated.•A phase transition of liquid to glass occurs at about 3.4 GPa upon compression.•The fraction of AAAA conformer increases with increasing pressure.•Nanoscale structural heterogeneities play an important role in the process.•It gives a deeper insight into pressure-induced amorphization of ionic liquids.Phase behavior of ionic liquid [HMIM][PF6] has been investigated under high pressure up to 5.6 GPa at room temperature. The results indicated that [HMIM][PF6] might experience a phase transition at about 3.4 GPa upon compression, which could be identified as solidification to superpressurized glass by ruby R1 line broadening measurement and synchrotron X-ray diffraction (XRD) patterns. For conformational equilibrium, the fraction of all-anti (AAAA) conformer increased upon compression, while the conformational change was independent of temperature. These facts indicated that there were large differences of the structure in response to the extreme conditions, especially in the structure of the cation.
Co-reporter:Haining Li, Zheng Wang, Liucheng Chen, Jie Wu, Haijun Huang, Kun Yang, Yongqiang Wang, Lei Su, and Guoqiang Yang
The Journal of Physical Chemistry B 2015 Volume 119(Issue 44) pp:14245-14251
Publication Date(Web):October 14, 2015
DOI:10.1021/acs.jpcb.5b08384
Room temperature ionic liquids (RTILs) have intriguing high-pressure phase behavior, and investigation of how pressure affects phase transitions of RTILs might yield interesting results. We here present kinetically driven phase transitions of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([Emim][CF3SO3]) at different rates of ∼0.3 and ∼1.2 GPa/h up to ∼5 GPa. Two crystalline phases formed at ∼1.3 and ∼1.7 GPa with increasing pressure at lower compression rate of ∼0.3 GPa/h; however, the amorphous phase solidified with superpressurized glass above ∼3.3 GPa at higher compression rate of ∼1.2 GPa/h. Notably, crystal polymorphism is discussed in view of the conformational isomerism of [Emim]+ cation and an unknown cation conformer is observed. These facts indicate that kinetic effect on pressure-induced phase transitions of [Emim][CF3SO3] might be dependent on compression rate, which needs to be considered as a non-negligible factor for phase transitions of RTILs under high pressure.
Co-reporter:Tianjun Yu, Yi Zeng, Jinping Chen, Xiaohui Zhang, Guoqiang Yang and Yi Li
Journal of Materials Chemistry A 2014 vol. 2(Issue 48) pp:20500-20505
Publication Date(Web):31 Oct 2014
DOI:10.1039/C4TA04914D
A composite catalyst Hy-pyr/PVP constructed by incorporating a hydrophobic [Fe–Fe]-hydrogenase mimic (Hy-pyr) into the self-crosslinked polyvinylpyrrolidone (PVP) hydrogel has been successfully applied to photocatalytic production of hydrogen in aqueous solution with high catalytic activity and efficiency. The present study provides a general, simple and efficient strategy for the application of water-insoluble catalysts in aqueous solution by using the PVP hydrogel.
Co-reporter:Xuan Liu, Shayu Li, Jiao Feng, Yi Li and Guoqiang Yang
Chemical Communications 2014 vol. 50(Issue 21) pp:2778-2780
Publication Date(Web):22 Jan 2014
DOI:10.1039/C3CC49147A
A novel triarylboron compound, MPB, exhibiting reversible thermochromic dual-fluorescence in solid-state polymers and in liquid solvents was designed and synthesized. The fluorescent solid-state polymer with MPB can serve as a highly sensitive self-reference temperature indicator with a concentration independent feature.
Co-reporter:Lixia Cao, Xiaoyan Li, Shuangqing Wang, Shayu Li, Yi Li and Guoqiang Yang
Chemical Communications 2014 vol. 50(Issue 63) pp:8787-8790
Publication Date(Web):20 Jun 2014
DOI:10.1039/C4CC03716B
A new nanogel indicator (NGI) for ratiometric fluorescent detection of intracellular pH values has been reported. In aqueous solution, the NGI can be used for ratiometric sensing of pH changes with a large hypsochromic shift of 100 nm in the green–red region and reversible. Furthermore, the NGI has been used to calibrate the cytosol pH value in living cells.
Co-reporter:Jian Xu, Jun Chen, Li Chen, Rui Hu, Shuangqing Wang, Shayu Li, Jin Shi Ma, Guoqiang Yang
Dyes and Pigments 2014 Volume 109() pp:144-150
Publication Date(Web):October 2014
DOI:10.1016/j.dyepig.2014.05.020
•Octa-(4-tert-butylphenoxy) substituted Ga and In naphthalocyanines were synthesized.•Optical limiting properties of the naphthalocyanines were investigated with 532 nm laser.•The metal naphthalocyanines might be potential optical limiting materials for practical applications.Octa-(4-tert-butylphenoxy) substituted naphthalocyanines coordinated with different central metals (Ga, In) were synthesized and their photophysical and optical limiting properties were investigated. The naphthalocyanines substituted peripherally with bulky groups have good solubility in organic solvents and the Q band absorption shows an obvious red shift to the near-IR region at about 800 nm. Studies on transient absorption spectra, photophysical parameters and optical limiting properties indicate that these compounds exhibit good optical limiting performance. The optical limiting thresholds of the naphthalocyanines are 0.26, 0.15 J cm−2 for Gallium naphthalocyanines and Indium naphthalocyanines, respectively. The naphthalocyanines possess higher triplet state quantum yields (ФT) and triplet-minus-ground state extinction coefficients (ΔεT) than other simple phthalocyanines, which results in better optical limiting behaviour.
Co-reporter:Li Chen, Cheng Liu, Rui Hu, Jiao Feng, Shuangqing Wang, Shayu Li, Chunhong Yang, Guoqiang Yang
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2014 Volume 128() pp:295-299
Publication Date(Web):15 July 2014
DOI:10.1016/j.saa.2014.02.166
•A two-photon absorption compound, DMDP-CH2Br, was synthesized and linked to LHC-II.•The LHC-II-dye complex can absorb two photons of the laser light effectively.•The absorbed energy in the LHC-II-dye complex can transfer to chlorophyll a.The plant light-harvesting complexes of photosystem II (LHC-II) play important roles in collecting solar energy and transferring the energy to the reaction centers of photosystems I and II. A two photon absorption compound, 4-(bromomethyl)-N-(4-(dimesitylboryl)phenyl)-N-phenylaniline (DMDP-CH2Br), was synthesized and covalently linked to the LHC-II in formation of a LHC-II-dye complex, which still maintained the biological activity of LHC-II system. Under irradiation with femtosecond laser pulses at 754 nm, the LHC-II-dye complex can absorb two photons of the laser light effectively compared with the wild type LHC-II. The absorbed excitation energy is then transferred to chlorophyll a with an obvious fluorescence enhancement. The results may be interesting and give potentials for developing hybrid photosystems.Graphical abstractA two photon absorption compound, 4-(bromomethyl)-N-(4-(dimesitylboryl)phenyl)-N-phenyl-aniline (DMDP-CH2Br), was synthesized and covalently linked to the LHC-II in formation of a LHC-II-dye complex. The LHC-II-dye complex can absorb two photons of the laser light effectively. The absorbed excitation energy is then transferred to chlorophyll a with an obvious fluorescence enhancement. The work may be interesting and give potentials for developing hybrid photosystems.
Co-reporter:Xiaohui Zhang, Yi Zeng, Tianjun Yu, Jinping Chen, Guoqiang Yang, and Yi Li
The Journal of Physical Chemistry Letters 2014 Volume 5(Issue 13) pp:2340-2350
Publication Date(Web):June 12, 2014
DOI:10.1021/jz5007862
Dendrimers are regularly and hierarchically branched synthetic macromolecules with numerous chain ends all emanating from a single core, which makes them attractive candidates for energy conversion applications. During photosynthesis and photocatalysis, photoinduced electron transfer and energy transfer are the main processes involved. Studies on these processes in dendritic systems are critical for the future applications of dendrimers in photochemical energy conversion and other optoelectronic devices. In this Perspective, the recent advances of photofunctional dendrimers in energy conversion based on light-harvesting systems, solar cells, and photochemical production of hydrogen will be discussed. The electron-transfer and energy-transfer characteristics in light-harvesting photofunctional dendrimers and the regulation of the electron-transfer process and the stabilization of the charge separation state in hydrogen photoproduction are emphasized.
Co-reporter:Qingshan Hao, Shuai Yu, Shayu Li, Jinping Chen, Yi Zeng, Tianjun Yu, Guoqiang Yang, and Yi Li
The Journal of Organic Chemistry 2014 Volume 79(Issue 1) pp:459-464
Publication Date(Web):December 4, 2013
DOI:10.1021/jo402583y
A novel series of syn- and anti-ladder-type anilido–pyridine boron difluorides (APBDs) were synthesized by stepwise incorporation of boron into laddered ligands. The boron coordination-locked strategy endows the ladder-type APBDs with a stiff conformation, which results in a substantial bathochromic shift of their absorption spectra and a narrowed HOMO–LUMO energy gap, reinforcing the compounds for potential applications in organic electronics.
Co-reporter:Li Chen;Jian Xu;Hua Yuan;ShuMin Yang;LianSheng Wang
Science China Chemistry 2014 Volume 57( Issue 12) pp:1746-1750
Publication Date(Web):2014/12/01
DOI:10.1007/s11426-014-5122-y
A device was designed and assembled to analyze the outgassing of molecular glass (MG) photoresists under extreme ultraviolet (EUV) exposure. The outgassing of the photoresists with different components and different concentrations of tert-butoxycarbonyl (t-Boc), photo-generated acid (PAG), and acid quencher was systematically investigated. Based on experiments, some solutions for reducing the outgassing of MG photoresists were proposed.
Co-reporter:Haining Li, Lei Su, Xiang Zhu, Xuerui Cheng, Kun Yang, and Guoqiang Yang
The Journal of Physical Chemistry B 2014 Volume 118(Issue 29) pp:8684-8690
Publication Date(Web):June 26, 2014
DOI:10.1021/jp500866z
The solubility of 1-ethyl-3-methylimidazolium hexafluorophosphate ([Emim][PF6]) in methanol under high pressure is newly measured quantitatively according to the correlation between the ratios of Raman intensity and the concentrations. In situ crystallization and cation conformation of [Emim][PF6] from methanol solution under high pressure have been investigated by using Raman spectroscopy in detail. Remarkably, crystal polymorphism was observed and two crystalline phases (phases I and II) coexisted under high pressure up to ∼1.4 GPa. However, only phase II was obtained by recrystallization at ∼2 GPa. Our findings may facilitate the development of an effective way for crystallization and purification of ionic liquids under high pressure.
Co-reporter:Xiaohui Zhang, Yi Zeng, Tianjun Yu, Jinping Chen, Guoqiang Yang, and Yi Li
Langmuir 2014 Volume 30(Issue 3) pp:718-726
Publication Date(Web):2017-2-22
DOI:10.1021/la404349w
A series of polyamidoamine (PAMAM) dendrimers with tetrathiafulvalene (TTF) at the periphery (Gn-PAMAM-TTF), generation 0–2, were synthesized. These functionalized dendrimers exist as nanospheres with diameters around 80–100 nm in aqueous phase, which can encapsulate hydrophobic molecules. The terminal TTF groups can go through a reversible redox process upon addition of the oxidizing and reducing agents. Each terminal TTF+• group of the oxidized Gn-PAMAM-TTF assembled with cucurbit[7]uril (CB[7]) forming a 1:1 inclusion complex with association constants of (3.14 ± 0.36) × 105, (1.29 ± 0.12) × 106, and (1.79 ± 0.24) × 106 M–1 for generation 0–2, respectively, even at the aggregate state. The formation of the inclusion complex loosened the structure of the nanospheres and initiated the release of cargo, and the release mechanism was validated by dynamic light scattering (DLS), cryo-transmission electron microscopy (TEM), and electron paramagnetic resonance (EPR) experiments. This study provides a potential strategy for the development of drug delivery systems synergistically triggered by redox and supramolecular assembly.
Co-reporter:Xiaoyan Li;Xudong Guo;Lixia Cao;Zhiqing Xun;Dr. Shuangqing Wang;Dr. Shayu Li;Dr. Yi Li;Dr. Guoqiang Yang
Angewandte Chemie International Edition 2014 Volume 53( Issue 30) pp:7809-7813
Publication Date(Web):
DOI:10.1002/anie.201403918
Abstract
Adenosine 5′-triphosphate (ATP) is a multifunctional molecule that participates in many important biological processes. Currently, fluorescence indicators for ATP with high performance are in demand. Reported herein is a novel water-soluble triarylboron compound which displays an apparent ATP-dependent fluorescence enhancement when dispersed in water. It can selectively recognize ATP from other bioactive substances in vitro and in vivo. The ATP-induced finite aggregation endows the indicator with appreciable photostability and superior tolerance to environmental electrolytes. This indicator has been successfully applied to the ATP imaging in NIH/3T3 fibroblast cells. The difference in the ATP levels within the membrane and cytosol is clearly visible.
Co-reporter:Jiao Feng;Lei Xiong;Shuangqing Wang;Shayu Li;Yi Li
Advanced Functional Materials 2013 Volume 23( Issue 3) pp:340-345
Publication Date(Web):
DOI:10.1002/adfm.201201712
Abstract
Fluorescent temperature sensing has received increasing interest in a wide range of fields, including fluid dynamics, micromechanics, and molecular cell biology. Here, a novel series of triarylboron compounds with significant thermosensitive hue transformation and high fluorescent quantum efficiency in wide temperature range is described. It is then demonstrated that fluorescent core/shell microcapsules based on one of the compounds exhibit outstanding temperature response. The microcapsules, dispersed in different liquid or solid media, can serve as highly robust, reliable, and sensitive fluorescent temperature sensors. The sensors are the first example containing a single organic luminophor with a self-reference feature that can detect on the micro- and macroscale from −30 to 140 °C. This finding may open a new avenue to the development of novel fluorescent temperature sensors.
Co-reporter:Lei Xiong, Jiao Feng, Rui Hu, Shuangqing Wang, Shayu Li, Yi Li, and Guoqiang Yang
Analytical Chemistry 2013 Volume 85(Issue 8) pp:4113
Publication Date(Web):March 13, 2013
DOI:10.1021/ac400252u
Anion recognition and sensing via artificial receptors have attracted a great deal of attention since they play a fundamental and important role in chemical, biological, medical, and environmental processes. Fluoride, as one of the smallest anions, is of particular interest because of its role in dental care and the analysis of drinking water. Herein, we invented a new method for F– detection by adopting the hydrogel as the supporter of reaction between a water insoluble fluorescent probe and F– in the water environment. This method is highly rapid, selective, and sensitive, which can determine F– levels in 15 s at the drinking water standard. A novel compound N-(3-(benzo[d]thiazol-2-yl)-4-(tert-butyldiphenylsilyloxy)phenyl) acetamide (BTBPA) was synthesized as the fluorescent probe because of the significant fluorescent color change from blue to green after the reaction with F–. This method does not require the probe substances to be water-soluble, which greatly expands the range of the specific fluorescent molecules used in ion detection. Additionally, just a few microliter samples were required in the analysis procedures with this method.
Co-reporter:Dr. Jianming Dong;Zhiqing Xun;Dr. Yi Zeng;Dr. Tianjun Yu;Dr. Yongbin Han;Dr. Jinping Chen;Dr. Ying-Ying Li;Dr. Guoqiang Yang;Dr. Yi Li
Chemistry - A European Journal 2013 Volume 19( Issue 24) pp:7931-7936
Publication Date(Web):
DOI:10.1002/chem.201300526
Abstract
A small amphiphile that contains a coumarin unit and alkynyl groups, as a two-photon-cleavable segment and polymerizable groups, respectively, was designed and synthesized. The amphiphile showed a critical aggregation concentration of about 4.6×10−5 M and formed a vesicle-type assembly. The formed vesicles were stabilized by in situ “click” polymerization without altering their morphology. Hydrophobic and hydrophilic guests can be encapsulated within the vesicle membrane and inside the aqueous core of the vesicle, respectively. The loaded guests can be released from the vesicle by using UV or near-IR stimuli, through splitting up the amphiphilic structure of the amphiphile. Distinguished dose-controlled photorelease of the polymeric vesicle is achieved with the maintenance of vesicular integrity, which makes the guest release dependent on the amount of cleavage of the amphiphilic structure during irradiation. This study provides a potential strategy for the development of versatile and stable drug-delivery systems that offer sustained and photo-triggered release.
Co-reporter:Dr. Tianjun Yu;Dr. Yi Zeng;Dr. Jinping Chen;Dr. Ying-Ying Li;Dr. Guoqiang Yang;Dr. Yi Li
Angewandte Chemie International Edition 2013 Volume 52( Issue 21) pp:5631-5635
Publication Date(Web):
DOI:10.1002/anie.201301289
Co-reporter:Li Chen, Rui Hu, Jian Xu, Shuangqing Wang, Xiyou Li, Shayu Li, Guoqiang Yang
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2013 Volume 105() pp:577-581
Publication Date(Web):15 March 2013
DOI:10.1016/j.saa.2012.12.063
The third-order nonlinear optical properties of a series of phthalocyanine–porphyrin complexes containing a sandwich-type bis(phthalocyaninato) europium(III) core and one or two zinc(II) porphyrin unit(s) were investigated by Z-scan techniques at 1064 nm. The second-order molecular hyperpolarizabilities of these complexes are in the order of 10−30 esu. The enhanced nonlinear properties are induced by the high delocalization of the electrons in the sandwich molecular structure, which may result in charge transfer between the central metal and the phthalocyanine ligands.Graphical abstractThird-order nonlinear optical properties of a series of phthalocyanine–porphyrin complexes containing a sandwich-type bis(phthalocyaninato) europium(III) core and one or two zinc(II) porphyrin unit(s) were investigated by Z-scan techniques at 1064 nm. The second-order molecular hyperpolarizabilities of these complexes are in the order of 10−30 esu.Highlights► Third-order nonlinear properties of porphyrin-bisphthalocyanines were investigated. ► Porphyrin-bisphthalocyanines are good materials with nonlinear optical properties. ► The enhanced nonlinearities are induced by high electron density and charge transfer.
Co-reporter:Yan Qian, Shayu Li, Qian Wang, Xiaohai Sheng, Shikang Wu, Shuangqing Wang, Juan Li and Guoqiang Yang
Soft Matter 2012 vol. 8(Issue 3) pp:757-764
Publication Date(Web):08 Nov 2011
DOI:10.1039/C1SM06358H
A highly fluorescent excited state intramolecular proton transfer (ESIPT) small molecular organic gelator based on 2-(2′-hydroxy)phenylbenzoxazole, N,N′-bis(4-(benzo[d]oxazol-2-yl)-3-hydroxyphenyl)-5-tert-butylisophthalamide, is developed in the present study. The ESIPT organogelator does not have a dendritic structure or long alkyl chains, but has a specific bent molecular structure. The intermolecular H-bonding (N–H⋯OC) between the J-aggregated dimers is the main driving force in the formation of the subsequent long-range one-dimensional assemblies in gel. The ESIPT gelator shows characteristics of aggregation-induced enhanced emission (AIEE). With its AIEE characteristics, ESIPT properties, simple and scalable fabrication of elongated nanobelts, as well as easy synthetic procedures, the versatile multifunctional fluorescent gelator has good prospects for future application in photoelectrical nanodevices.
Co-reporter:Guoqi Zhang, Shuangqing Wang, Jin Shi Ma, Guoqiang Yang
Inorganica Chimica Acta 2012 Volume 384() pp:97-104
Publication Date(Web):1 April 2012
DOI:10.1016/j.ica.2011.11.045
The reactions of a thiazolylazo ligand, 2-(2-thiazolylazo)-5-diethylaminophenol (HL) with zinc(II) chloride, nickel(II) acetate and cobalt(II) acetate resulted in the formation of the corresponding mononuclear coordination complexes, 1–3, both in solution and in the solid state. UV–Vis titration experiments in solution confirmed that the ligand and given metal salts interacted spontaneously with each other, producing exclusively mononuclear complexes with a metal/ligand ratio of 1:2. The solid-state structures of complexes 1 and 2 were determined by single-crystal X-ray diffraction analysis. In the structure of 1, zinc(II) ion is tetra-coordinate to two N atoms from the thiazolyl groups of two distinct HL ligands and two chloride counterions with a distorted tetrahedral geometry. In the structure of 2, the nickel ion is bound to four N atoms from both the thiazolyl groups and azo group moieties, and two O atoms from the phenol groups with a hexacoordinated mode. The third-order nonlinear optical (NLO) properties of both HL and 1–3 were studied by Z-scan technique in CHCl3 solution. The results showed that all four compounds exhibited strong nonlinear refraction, while complex 2 featured both large nonlinear absorption and refraction. The nonlinear refractive index values n2 of four compounds vary in the range of −1.20 × 10−18 to −3.42 × 10−18 m2/W. Their hyperpolarizability γ values are determined to be 2.01 × 10−35, 1.13 × 10−34, 2.09 × 10−34, and 7.83 × 10−34 esu for HL and 1–3, respectively, indicating that metal chelating did lead to considerable enhancement in third-order optical nonlinearities.Graphical abstractThe reactions of a thiazolylazo ligand, 2-(2-thiazolylazo)-5-diethylaminophenol (HL) with zinc(II) chloride, nickel(II) acetate and cobalt(II) acetate resulted in the formation of mononuclear coordination complexes, 1–3, both in solution and in the solid state. The solid-state structures of complexes 1 and 2 were determined by single-crystal X-ray diffraction analysis. The third-order nonlinear optical (NLO) properties of both HL and 1–3 were studied by Z-scan technique in CHCl3 solution. The result revealed that metal binding to azo ligand led to considerable enhancement in the third-order optical nonlinearities.Highlights► A new class of metal complexes based on a thiazolylazo dye has been synthesized. ► The structures of ZnII and NiII have been elucidated by X-ray crystallography. ► Solution UV–Vis titration revealed the spontaneous formation of mononuclear species. ► Third-order NLO studies confirmed that metal complexes had improved NLO behaviors.
Co-reporter:Yongfang Zhang;Quan Gan;Shuangqing Wang
Journal of Inorganic and Organometallic Polymers and Materials 2012 Volume 22( Issue 1) pp:48-53
Publication Date(Web):2012 January
DOI:10.1007/s10904-011-9621-4
An azo dye, 2-(4,5-dicyano-1-H-imidazolyazo)-5-N, N-diethylaminophenol, and the corresponding divalent copper and nickel mononuclear coordination complexes were synthesized. The molecular third-order nonlinear optical characteristics of these azo transition metallic chelates were investigated in N,N′-dimethylformamide solution using a standard Z-scan technique with a 7-ns laser pulses at 1,064 nm. The results of n2 (the nonlinear refraction index) and γ (the hyperpolarizability) values of the two complexes indicated that metal chelating lead to considerable enhancement in third-order optical nonlinearities, which revealed that such coordination complexes exhibit strong nonlinear optical absorption effects and self-defocusing performance. These materials are promising candidates as large third-order nonlinear optical materials.
Co-reporter:Tianjun Yu, Wen Wang, Jinping Chen, Yi Zeng, Yingying Li, Guoqiang Yang, and Yi Li
The Journal of Physical Chemistry C 2012 Volume 116(Issue 19) pp:10516-10521
Publication Date(Web):April 26, 2012
DOI:10.1021/jp3021672
Two series of dendrimer encapsulated Pt nanoparticles (DENPt) were created by using sixth generation poly(amidoamine) (PAMAM) dendrimers terminated with different numbers of hydroxyl groups (s-G6-OH and t-G6-OH) to mimic hydrogenases. Pt nanoparticles act as the active site to generate H2 by reducing H+, and dendrimers provide cavities to maintain the integrity of small Pt nanoparticles and prevent agglomeration. The artificial hydrogenases (t-G6-OH/Ptx and s-G6-OH/Ptx) were successfully applied to a light-induced hydrogen production system with Pt-tppa+, ethyl viologen, and TEOA as photosensitizer, electron relay, and sacrificial reagent, respectively, exhibiting excellent stability and efficient catalytic activity. No passivation effect is caused by the periphery hydroxyl groups of dendrimers. The optimal size of the Pt clusters consists of 200 Pt atoms, and the most adapted pH value is 9 to gain the highest catalytic efficiency in the applied hydrogen production system. This study provides a new strategy for developing artificial hydrogenases by using dendritic architectures.
Co-reporter:Kaijun Tian, Dehui Hu, Rui Hu, Shuangqing Wang, Shayu Li, Yi Li and Guoqiang Yang
Chemical Communications 2011 vol. 47(Issue 36) pp:10052-10054
Publication Date(Web):09 Aug 2011
DOI:10.1039/C1CC13056K
A highly luminescent compound, stilbene-2,4-dimethyl-6-(1,2,2,4-tetramethyl-1,2-dihydroquinolin-6-yl)-1,3,5-s-triazine (MQT), exhibits solvent polarity-induced emission enhancement. A fluorescent sensor array was fabricated with MQT and porous polymer substrates. The colorimetric changes of the array exposed to VOCs can be readily distinguished by the naked eye. Post-processing procedures proved the high selectivity of the array for VOCs.
Co-reporter:Dehui Hu, Zhipei Yang, Guoqi Zhang, Min Liu, Junfeng Xiang, Tongling Liang, Jinshi Ma and Guoqiang Yang
CrystEngComm 2011 vol. 13(Issue 20) pp:6021-6023
Publication Date(Web):05 Aug 2011
DOI:10.1039/C1CE05542A
A series of novel bis(pyrrolyl)carbohydrazide derivatives have been designed and synthesized. X-Ray structural analysis confirmed the formation of self-complementary hydrogen-bonded duplexes in all cases. Multiple intermolecular N–H⋯O hydrogen bonds play crucial roles in the formation of the duplexes and the evolution of meso-suprahelical structures in the solid state.
Co-reporter:Rui Hu, Shayu Li, Yi Zeng, Jinping Chen, Shuangqing Wang, Yi Li and Guoqiang Yang
Physical Chemistry Chemical Physics 2011 vol. 13(Issue 6) pp:2044-2051
Publication Date(Web):20 Dec 2010
DOI:10.1039/C0CP01181A
A few of excited state intramolecular proton transfer (ESIPT) compounds have been discovered for their aggregation induced emission enhancement (AIEE). To understand the AIEE mechanism, an ESIPT compound BTHPB (N-(4-(benzo[d]thiazol-2-yl)-3-hydroxyphenyl)benzamide) with simple structure was designed and synthesized. BTHPB showed apparent AIEE property and the emission efficiency was observed as high as 0.27 in the aggregates. On the basis of viscochromism experiments and calculations employing the linear coupling model, the restriction of the rotation between the two subunits taken place in ESIPT was considered as the main factor for the AIEE. The micro- and femtosecond transient absorption experiments offered evidence for the considerations. Additionally, we also observed a negative effect of aggregation on the fluorescence emission in the system. So the AIEE of ESIPT compound BTHPB originated from the combination effects of positive and negative factors induced by the aggregation.
Co-reporter:Guoqi Zhang, Jinshi Ma, Guoqiang Yang
Journal of Molecular Structure 2011 Volume 1004(1–3) pp:248-251
Publication Date(Web):12 October 2011
DOI:10.1016/j.molstruc.2011.08.012
A dinuclear cadmium(II) supramolecular complex containing a 9,10-anthraquinone-2,6-disulfonate chromophore was synthesized hydrothermally by using a mononuclear metal–organic synthon Cd(phen)2(NO3)2, 1, where phen is 1,10-phenanthroline. The compound was characterized by microanalysis, IR spectrum, thermogramic analysis and X-ray crystallography. The crystal structure exhibits a novel dinuclear supramolecular architecture based on Cd(phen)2 bridged with 9,10-anthraquinone-2,6-disulfonate (ads). Both intra and intermolecular hydrogen bonds contribute to extend the dinuclear assay to a two-dimensional (2D) network. Photoluminescence property has been measured in the solid state at ambient temperature.Highlights► A dinuclear CdII complex was synthesized by using a metal–organic synthon. ► Structural analysis revealed an oligomeric complex with two distinct chromophores. ► Intermolecular hydrogen bonds contribute to the formation of a 2D network. ► The complex shows interesting photoluminescence property in the solid state.
Co-reporter:Guoqi Zhang, Lanying Yang, Jinshi Ma, Guoqiang Yang
Journal of Molecular Structure 2011 Volume 1006(1–3) pp:542-546
Publication Date(Web):14 December 2011
DOI:10.1016/j.molstruc.2011.09.064
The hydrogen-bonding potential and complexation behavior with copper(II) of a multidentate Schiff-base ligand, 1,2-bis((1H-pyrrol-2-yl)methylene)hydrazine (H2L) was studied. Crystallization of H2L from an aqueous methanol solution resulted in the formation of an adduct H2L·H2O, which features a two-dimensional (2D) supramolecular hydrogen-bonded network, as evidenced by X-ray structural analysis. The reaction of H2L with copper(II) salt in a CH2Cl2MeOH solution formed a dinuclear double-stranded helicate, Cu2(L)2 (1) in high yield, which was characterized by microanalysis, IR spectra, and single-crystal X-ray crystallographic analysis. UV–vis titration experiments confirmed the spontaneous formation of a 1:1 metal–ligand complex in solution.Highlights► The reactions of a multidentate H2L with water or copper salts were investigated. ► A 2D organic hydrogen-bonded network was observed in the crystals of adduct H2L·H2O. ► The reaction of H2L with CuII produced a dinuclear helicate. ► The structure was confirmed by both X-ray analysis and UV–vis titration in solution.
Co-reporter:Guoqiang Yang, Kai Zhang, Fangbin Gong, Min Liu, Zhipei Yang, Jinshi Ma, Shayu Li
Sensors and Actuators B: Chemical 2011 Volume 155(Issue 2) pp:848-853
Publication Date(Web):20 July 2011
DOI:10.1016/j.snb.2011.01.060
A new fluorescent excited state intramolecular proton transfer compound, 2-(2-hydroxy-4-carbaldehydephenyl)benzoxazole (HCPBO), has been synthesized for the detection of Cu2+, based on its fluorescence quenching. In molecular monodispersed solution, the recognition selectivity for Cu2+ was poor as Co2+ and Ni2+ gave similar results in fluorescence quenching. However, the nanoparticles of HCPBO, prepared in ethanol–water (1:4, v/v), greatly enhanced the recognition selectivity for Cu2+. The mechanism was discussed as energy transfer (ET), energy migration (EM) and the more quantity of formed HCPBO–Cu2+ complex than other metal ions in the nanoparticle conditions enhanced the recognition selectivity for Cu2+ together.
Co-reporter:Zhipei Yang, Kai Zhang, Fangbin Gong, Shayu Li, Jun Chen, Jin Shi Ma, Lyubov N. Sobenina, Albina I. Mikhaleva, Boris A. Trofimov, Guoqiang Yang
Journal of Photochemistry and Photobiology A: Chemistry 2011 Volume 217(Issue 1) pp:29-34
Publication Date(Web):1 January 2011
DOI:10.1016/j.jphotochem.2010.09.012
A new pyrazole-based fluorescent sensor, 5-amino-3-(5-phenyl-1H-pyrrol-2-yl)-1H-pyrazole-4-carboxamide (compound 1), was studied for fluoride anion (F−) detection in organic or water-containing solution. This compound displayed both changes in UV–vis absorption and fluorescence emission spectra upon addition of F−. With increasing of F−, blue emission intensity increases drastically and reaches saturation with 607-fold enhancement at 424 nm. The results indicate that compound 1 has highly selectivity for fluoride detection over other anions, such as Cl−, Br−, I−, HSO4−, H2PO4− and AcO− in DMSO or aqueous DMSO solutions. 1H NMR titration and other experiments confirm that the sensing process is mainly from the deprotonation of the pyrazole–NH in compound 1.
Co-reporter:Jiao Feng;Kaijun Tian;Dehui Hu;Dr. Shuangqing Wang;Dr. Shayu Li;Dr. Yi Zeng;Dr. Yi Li;Dr. Guoqiang Yang
Angewandte Chemie International Edition 2011 Volume 50( Issue 35) pp:8072-8076
Publication Date(Web):
DOI:10.1002/anie.201102390
Co-reporter:Dr. Yan Qian;Min-Min Cai;Dr. Ling-Hai Xie; Guo-Qiang Yang; Shi-Kang Wu; Wei Huang
ChemPhysChem 2011 Volume 12( Issue 2) pp:397-404
Publication Date(Web):
DOI:10.1002/cphc.201000457
Abstract
An intensive investigation of structure–property relationships in the aggregation-induced enhanced emission (AIEE) of luminescent compounds is essential for the rational design of highly emissive solid-state materials. In the AIEE-active compounds N,N′-bis[3-hydroxy-4-(2′-benzothiazolyl)phenyl]isophthalamide and N,N′-bis[3-hydroxy-4-(2′-benzothiazolyl)phenyl]-5-tert-butylisophthalamide, fast photoinduced twisted intramolecular charge transfer (TICT) of the enol excited state is found to be mainly responsible for the weak emission of their dilute solutions. The photoinduced TICT enol excited state is formed with a greatly distorted configuration, due to the large rotation about the CN single bond. This facilitates nonradiative TICT decay from the normal enol excited state to the highly twisted enol excited state, rather than proton-transfer decay to the keto excited state. In aggregates, photoinduced nonradiative deactivation of TICT is strongly prohibited, so that excited-state intramolecular proton transfer (ESIPT) becomes the dominant decay, and hence contributes greatly to the subsequent emission enhancement of the keto form. Molecular design and investigation of analogous single-armed compounds further verifies this kind of AIEE mechanism.
Co-reporter:Fangbin Gong, Qian Wang, Jun Chen, Zhipei Yang, Min Liu, Shayu Li and Guoqiang Yang, Ligang Bai, Jing Liu and Yuhui Dong
Inorganic Chemistry 2010 Volume 49(Issue 4) pp:1658-1666
Publication Date(Web):January 12, 2010
DOI:10.1021/ic9020417
To explore the effect of intertrimer Cu···Cu interactions on the phosphorescent properties of trimeric copper(I) pyrazolates, three new complexes with identical core cluster structures and different substituents, {[3,5-(Me)2-4-(Ph)Pz]Cu}3 (MPC-P), {[3,5-(Me)2-4-(1-Naph)Pz]Cu}3 (MPC-N), and {[3,5-(Me)2-4-(9-Anthr)Pz]Cu}3 (MPC-A), were synthesized. The intertrimer Cu···Cu distances of the three complexes were obtained from X-ray crystallographic data or molecular dynamics simulations. The phosphorescent properties of the three complexes were investigated at various pressures. At ambient pressure, the emissions of the three complexes were dramatically different from each other. For MPC-P, the main emission band was identified as phosphorescence and MPC-N gave a predominant emission of fluorescence and a weak emission of phosphorescence. When the substitutent was replaced by an anthryl group in MPC-A, no phosphorescence was observed, except for a strong fluorescence band. The phosphorescence of the trimer copper(I) pyrazolates was assigned to the excited-state dimer/polymer *[Cu3]n with LMCT characteristics. Under higher external pressures, only phosphorescent intensities of MPC-P showed considerable enhancement at pressures up to 2 GPa. External pressure reduced the intertrimer Cu···Cu distances of MPC-P and enhanced the phosphorescence intensities, providing a direct evidence to support the assignment of phosphorescence.
Co-reporter:Yan Qian, Minmin Cai, Shuangqing Wang, Yuanping Yi, Zhigang Shuai, Guoqiang Yang
Optics Communications 2010 Volume 283(Issue 10) pp:2228-2233
Publication Date(Web):15 May 2010
DOI:10.1016/j.optcom.2010.01.026
A nickel complex of 5-(acrylamido)methyl-8-hydroxyquinoline, bis-(5-(acrylamido)methyl-8-hydroxyquinolino) nickel(II) (Ni(AAMQ)2) has been synthesized and its third-order nonlinear optical properties was investigated with respect to that of bis-(8-hydroxyquinolino) nickel(II) (NiQ2) by single beam Z-scan technique. The real parts (γR) of the molecular second-order hyperpolarizabilities were −6.0 × 10−46 and −5.5 × 10−46 m5/v2 for NiQ2 and Ni(AAMQ)2, respectively, indicative of similar nonlinear refraction both in sign and in magnitude. After substitution of an acrylamidomethyl group to the 8-hydroxyquinoline (8-HQ) ligand, the nonlinear absorption coefficient of Ni(AAMQ)2 was enhanced by more than two times. The corresponding imaginary part (γI) of the molecular second-order hyperpolarizability was 3.4 × 10−46 m5/v2 for Ni(AAMQ)2 while 1.6 × 10−46 m5/v2 for NiQ2. The increase in nonlinear absorption was attributed to the substitution effect and the enhanced transition dipole moment due to the participation of δ-donor group of CH2 in the molecular conjugation.
Co-reporter:Rui Hu;Jiao Feng;Dehui Hu;Shuangqing Wang Dr.;Shayu Li Dr.;Yi Li Dr. Dr.
Angewandte Chemie International Edition 2010 Volume 49( Issue 29) pp:4915-4918
Publication Date(Web):
DOI:10.1002/anie.201000790
Co-reporter:Lei Han Dr.;Hengxing Wei;Shayu Li Dr.;Jinping Chen Dr.;Yi Zeng Dr.;Ying-Ying Li Dr.;Yongbin Han Dr.;Yi Li Dr.;Shuangqing Wang Dr. Dr.
ChemPhysChem 2010 Volume 11( Issue 1) pp:229-235
Publication Date(Web):
DOI:10.1002/cphc.200900556
Abstract
A supramolecular dyad, BP-(amidinium-carboxylate)-NBD is constructed, in which benzophenone (BP) and norbornadiene (NBD) are connected via an amidinium-carboxylate salt bridge. The photophysical and photochemical properties of the assembled BP-(amidinium-carboxylate)-NBD dyad are examined. The phosphorescence of the BP chromophore is efficiently quenched by the NBD group in BP-(amidinium-carboxylate)-NBD via the salt bridge. Time-resolved spectroscopy measurements indicate that the lifetime of the BP triplet state in BP-(amidinium-carboxylate)-NBD is shortened due to the quenching by the NBD group. Selective excitation of the BP chromophore results in isomerization of the NBD group to quadricyclane (QC). All of these observations suggest that the triplet–triplet energy transfer occurs efficiently in the BP-(amidinium-carboxylate)-NBD salt bridge system. The triplet–triplet energy transfer process proceeds with efficiencies of approximately 0.87, 0.98 and the rate constants 1.8×103 s−1, and 1.3×107 s−1 at 77 K and room temperature, respectively. The mechanism for the triplet–triplet energy transfer is proposed to proceed via a “through-bond” electron exchange process, and the non-covalent bonds amidinium-carboxylate salt bridge can mediate the triplet–triplet energy transfer process effectively for photochemical conversion.
Co-reporter:Min Liu, Zhipei Yang, Wenhao Sun, Xiuping Li, Juan Li, Jinshi Ma, Guoqiang Yang
Inorganica Chimica Acta 2009 Volume 362(Issue 8) pp:2884-2889
Publication Date(Web):1 June 2009
DOI:10.1016/j.ica.2009.01.010
Co-reporter:Jun Chen, Shayu Li, Fangbin Gong, Zhipei Yang, Shuangqing Wang, Huijun Xu, Yi Li, Jin Shi Ma and Guoqiang Yang
The Journal of Physical Chemistry C 2009 Volume 113(Issue 27) pp:11943-11951
Publication Date(Web):May 22, 2009
DOI:10.1021/jp902723h
A novel solid matrix doped with tetra-α-(4-tert-butylphenoxy) gallium phthalocyanine (TBP-GaPc) was prepared. Photophysical properties were investigated in order to analyze the effect of triplet−triplet annihilation (TTA) of the phthalocyanine (Pc) both in a solid matrix and in a tetrahydrofuran (THF) solution at different concentrations. The rigid surroundings of the Pc molecules in the solid matrix greatly reduce the aggregation, resulting in much lower probability of the TTA process. With the deductive kinetic models, the rate constant and the percentage of TTA were obtained. In a THF solution, the summation of the first-order exponential decay rate constants k1 and the apparent rate constants of triplet−triplet annihilation k2′ is much larger than that in the solid matrix, and the percentages of TTA in THF solutions are much higher (7.74−50.9%) than that in solid matrixes (1.05−6.51%) from 5.0 × 10−6 to 1.0 × 10−3 M. The results of the TTA process and photophysical properties strongly suggest that the Pc doped in the solid matrix will give better optical limiting behaviors than that in liquid solution.
Co-reporter:Xiuping Li, Yan Qian, Shuangqing Wang, Shayu Li and Guoqiang Yang
The Journal of Physical Chemistry C 2009 Volume 113(Issue 9) pp:3862-3868
Publication Date(Web):2017-2-22
DOI:10.1021/jp809911s
Luminescent organic nanoparticles consisting of a green-emitting ESIPT compound DHBIA doped with a red-emitting dye MAFN have been prepared by the reprecipitation method. It was found that emission of nanoparticles can be tuned gradually from green to red by increasing doping levels. These nanoparticles could be analyzed as a system of densely packed chromophores that showed efficient energy transfer from DHBIA to MAFN. The energy transfer in these systems was assigned to the Förster resonance mechanism. A simple model was modified and used to analyze quantitatively this energy transfer behavior in doped nanoparticles. The bathochromic of guest emission was presumably due to solid state solvation effects (SSSE).
Co-reporter:Wenhao Sun, Shayu Li, Rui Hu, Yan Qian, Shuangqing Wang and Guoqiang Yang
The Journal of Physical Chemistry A 2009 Volume 113(Issue 20) pp:5888-5895
Publication Date(Web):April 29, 2009
DOI:10.1021/jp900688h
A triple fluorescent compound, N-salicylidene-3-hydroxy-4-(benzo[d]thiazol-2-yl)phenylamine (SalHBP), was dispersed in solid polymers and was developed as a white-light-emitting source in LED by using it as the first simple single compound with different configurations. The CIE coordinates were at (0.29, 0.35), close to those of pure white light. To explore speciation mechanisms in this single compound white light, SalHBP was dissolved in protic, nonpolar, and moderate polar solvent, respectively. Upon excitation, blue, green, and yellowish green emissions were observed from the three solutions at various temperatures. The conformation of SalHBP at room temperature was described by a Car−Parrinello molecular dynamics simulation. With the aid of hybrid density functional theory at the B3LYP/TZVP and PBE0/TZVP levels, three observed emission bands of SalHBP were assigned from the five most probable excited state conformations that were derived from four ground state conformations. The effect of solvent on the emission of SalHBP was summarized as a possibility for forming intermolecular hydrogen bonds between solvent and SalHBP molecules and competition between intra- and intermolecular hydrogen bonds.
Co-reporter:Jun Chen, Quan Gan, Shayu Li, Fangbin Gong, Qian Wang, Zhipei Yang, Shuangqing Wang, Huijun Xu, Jin Shi Ma, Guoqiang Yang
Journal of Photochemistry and Photobiology A: Chemistry 2009 Volume 207(Issue 1) pp:58-65
Publication Date(Web):5 September 2009
DOI:10.1016/j.jphotochem.2009.04.012
A series of peripherally substituted phthalocyanines (Pcs) with different central metals (Al, Ga and In) and axial chloride ligand were synthesized and their photophysical and optical limiting properties were investigated. The Q band absorption of the Pc shifts to longer wavelength with the central metals changing from Al to In, and the fluorescence quantum yields of S1 emission decrease remarkably from Al to In. Transient absorption spectra of the Pcs in THF were measured in determination of the photophysical parameters. The optical limiting properties were investigated by a nanosecond pulse laser at 532 nm. All of these compounds exhibit good optical limiting performance, and the optical limiting behaviors of solid solution in glass obtained by sol–gel technique are much better than that of liquid solution. Several factors which affect the optical limiting performance of the Pcs with different central metals and substituents are discussed.
Co-reporter:Min Liu;Xiuping Li;Juan Li;Wenhao Sun;Zhipei Yang
Transition Metal Chemistry 2009 Volume 34( Issue 2) pp:185-190
Publication Date(Web):2009 March
DOI:10.1007/s11243-008-9176-6
Two Co(II) coordination polymers, [Co(Hbtc)(bix)]n, (1) and [Co(1,4-bdc)(bix)H2O]n (2) (bix = 1,4-bis(imidazole-1-ylmethyl)benzene; H3btc = benzene-1,3,5-tricarboxylic acid; 1,4-H2bdc = benzene-1,4-dicarboxylic acid) have been synthesized under hydrothermal conditions and structurally characterized. X-ray structure analysis reveals that in polymer 1, 2D infinite grid-like frameworks are interconnected by hydrogen-bond interactions to result in a 3D supramolecular architecture, in which the three carboxylate groups of the H3btc molecule adopt three different coordination modes. In polymer 2, 1,4-bdc ligands with cobalt atoms construct 1D zigzag chains which are bridged by bix ligands to form a 3D framework.
Co-reporter:Alexander M. Vasil’tsov;Kai Zhang
Monatshefte für Chemie - Chemical Monthly 2009 Volume 140( Issue 12) pp:
Publication Date(Web):2009 December
DOI:10.1007/s00706-009-0200-0
The reaction of 1-vinylpyrrole-2-carbaldehydes with hydroxylamine hydrochloride in pyridine or ethanol in the presence of NaHCO3 or NaOAc affords previously unknown 1-vinylpyrrole-2-carbaldehyde oximes in 95–99% yields. Isomerization of oximes from (E) to (Z) in the presence of strong acids and the spectral characteristics of the isomers were studied.
Co-reporter:Juan Li ; Shuangqing Wang ; Shayu Li ; Qian Wang ; Yan Qian ; Xiuping Li ; Min Liu ; Yi Li
Inorganic Chemistry 2008 Volume 47(Issue 4) pp:1255-1257
Publication Date(Web):February 11, 2008
DOI:10.1021/ic7018583
A water-chemical route to synthesize copper phthalocyanine (CuPC) is reported in this paper. The molecules were self-assembled into regular β-CuPC single-crystal nanobelts simultaneously. The molecular structure of CuPC in the nanobelts was characterized by UV–vis absorption spectroscopy, MALDI-TOF-MS, and elemental analysis. The morphology and crystal phase of the nanobelts were investigated by electron microscopy and X-ray diffraction, respectively. Crucial factors for the formation of CuPC nanobelts were also investigated. The cooperative effect of the surfactant and copper powder was important for the formation of CuPC. The CuPC nanobelts were obtained through a self-assembly process. In addition, a phase transition process, which resulted in the formation of β-CuPC single-crystal nanobelts, took place with prolonged time.
Co-reporter:Guoqi Zhang Dr. ;Shuangqing Wang;Qingqi Chen Dr.;Jin Shi Ma
Chemistry - A European Journal 2007 Volume 13(Issue 13) pp:
Publication Date(Web):22 JAN 2007
DOI:10.1002/chem.200600514
A series of flexible bis(9-anthryldiamine) ligands (L1–L3) linked with alkyl spacers of different chain length was synthesized and characterized, in order to investigate the coordination behavior of these diamine ligands with metal ions (Zn2+, etc.) based on fluorescence measurements. The results showed that, in the case of anthryldiamine ligands bearing two- or four-carbon links, the zinc ion induced a chelation-enhanced fluorescence (CHEF) effect in aqueous media, while a trace amount of water could selectively quench the blue emission of the ZnII complex with a three-carbon-linked ligand (1). Meanwhile, the introduction of more water (concentration >11 %) resulted in the formation of a new green luminescent species; the luminescence intensity was enhanced stepwise to a maximum with addition of approximately 30 % water in THF solution. The peak position (centered at approximately 500 nm) and the lifetime measurement (τ=19.59 ns) indicated that the green luminescence was attributable to a novel edge-to-face dimeric conformation (“T-shaped” conformation) of anthracene, and not to the more common face-to-face dimeric conformation. Accordingly, 1H NMR spectroscopic studies in nonaqueous or aqueous solution confirmed this T-shaped conformation, which is consistent with the results of single-crystal X-ray structure analysis and solid-state photoluminescence studies.
Co-reporter:Jinping Chen, Lu Zhang, Shayu Li, Ying-Ying Li, Jie Chen, Guoqiang Yang, Yi Li
Journal of Photochemistry and Photobiology A: Chemistry 2007 Volume 185(Issue 1) pp:67-75
Publication Date(Web):1 January 2007
DOI:10.1016/j.jphotochem.2006.05.013
A series of poly(aryl ether) dendrimers with a norbornadiene (NBD) group attaching to the core (Gn-NBD), generations 1–4, were synthesized and characterized, and their photophysical and photochemical properties were examined. The fluorescence of the dendrimer backbone is quenched by the norbornadiene group as a result of the electron transfer and energy transfer from the dendrimer backbone to the norbornadiene group in Gn-NBD. Selective excitation of the dendrimer backbone results in an isomerization of the norbornadiene group to the quadricyclane (QC) group. The intramolecular electron transfer and energy transfer efficiencies are ca. 0.93, 0.73, 0.54, 0.30 in dichloromethane, and ca. 0.90, 0.70, 0.55, 0.34 in tetrahydrofuran for generations 1–4, respectively, with the rate constant ca. 1010 s−1. The light-harvesting ability of these dendritic molecules is demonstrated by the enhanced valence isomerization rate of NBD to QC with increasing generation.
Co-reporter:Guo-Qi Zhang, Guo-Qiang Yang, Lin-Na Zhu, Qing-Qi Chen, Jin-Shi Ma
Sensors and Actuators B: Chemical 2006 Volume 114(Issue 2) pp:995-1000
Publication Date(Web):26 April 2006
DOI:10.1016/j.snb.2005.08.014
We herein report on the synthesis and characterization of two similar bis-9-anthryldiamine ligands, N,N′-bis(anthrylmethyl)-ethylene diamine (BAEDA) and N,N′-bis(anthrylmethyl)-propylene diamine (BAPDA) and the crystal structure of one ZnII coordination complex of BAPDA. In pure organic solvents, BAPDA displayed strong fluorescence enhancement titrated by Zn2+, but the emission of the complex could be remarkably quenched by a trace amount of water, which hence showed less applicable potential for detection of Zn2+. While BAEDA was found to be an excellent fluorescent responsor for Zn2+, which could operate in a HEPES buffer (pH 7.5, 100 mM, H2O/THF = 1/1). The fluorescent intensity achieved nearly a 6.5-fold increase after the addition of 10 equivalents of Zn2+. Moreover, BAEDA had remarkably higher selectivity to Zn2+ than that to other heavy metal ions, such as Ag+, Cu2+, Pb2+, Mn2+, Co2+, Hg2+, Ni2+, Fe2+, etc., indicating that BAEDA may be a potential fluorescent sensor for Zn2+.
Co-reporter:Shuangqing Wang Dr.;Quan Gan;Huijun Xu ;Shayu Li Dr. ;Yongfang Zhang
ChemPhysChem 2006 Volume 7(Issue 4) pp:935-941
Publication Date(Web):9 MAR 2006
DOI:10.1002/cphc.200500595
Two soluble heavy-metal phthalocyanine derivatives, namely, tetra-α-(2-ethylbutoxy) chloroindium phthalocyanine (α-InPcCl) and tetra-β-(2-ethylbutoxy) chloroindium phthalocyanine (β-InPcCl), were synthesized. Their optical-limiting properties in THF solution were investigated with a 532 nm nanosecond laser. The differences in the optical-limiting properties are attributed to their different photophysical properties. α-InPcCl is superior to β-InPcCl as optical-limiting material, α substitution could be a useful factor to be considered in designing optical limiting materials based on metal phthalocyanines.
Co-reporter:Lu Zhang, Jinping Chen, Shayu Li, Jie Chen, Ying-Ying Li, Guoqiang Yang, Yi Li
Journal of Photochemistry and Photobiology A: Chemistry 2006 Volume 181(2–3) pp:429-436
Publication Date(Web):31 July 2006
DOI:10.1016/j.jphotochem.2006.01.002
A series of Fréchet-type bis(dendron) poly(aryl ether) dendrimers ([BP-Gn]2-NBD, n = 1–3) with the benzophenone (BP) chromophores and the norbornadiene (NBD) group attached to the periphery and the core, respectively, were synthesized, and their photophysical and photochemical properties were investigated by using steady-state and time-resolved techniques. Intramolecular triplet energy transfer from the peripheral BP chromophores to the core NBD group in [BP-Gn]2-NBD occurs with the efficiency of ca. 84%, 56% and 48%, and with the rate constant of 1.9 × 107, 1.2 × 107, 1.1 × 107 s−1 at room temperature for generations 1–3, respectively. Selective excitation of the BP groups resulted in the isomerization of NBD to the quadricyclane (QC). The quantum yields of the intramolecular photosensitized isomerization for [BP-Gn]2-NBD are measured to be ca. 0.147, 0.098 and 0.087 for generations 1–3, respectively. The light-harvesting ability of these molecules increases with increasing the number of peripheral chromophores. The rate constant of the triplet–triplet energy transfer decreases inconspicuously with increasing generation, which validates that the intramolecular triplet energy transfer mainly takes place via a through space mechanism involving the closest donor and the acceptor groups by folding of the dendrimer structure, and the bis(dendron) system takes more congested conformation than the corresponding monodendron system.
Co-reporter:Guo-qi Zhang;Guo-qiang Yang;Lan-ying Yang;Qing-qi Chen;Jin-Shi Ma
European Journal of Inorganic Chemistry 2005 Volume 2005(Issue 10) pp:
Publication Date(Web):18 MAY 2005
DOI:10.1002/ejic.200400926
Silver(I) (3) and palladium(II) (4) complexes of 1,2-bis[(anthracen-9-ylmethyl)amino]ethane have been synthesized and structurally characterized. X-ray crystal structure analysis reveals that compound 3 exists as a dinuclear tris(ligand) complex with formula [Ag2(2)3]·2NO3, in which each silver center is three-coordinate to form a slightly distorted planar-trigonal geometry with three nitrogen donors originating from two distinct ligands. Compound 4, on the other hand, is a mononuclear bis(ligand) complex with formula [Pd(2)2]·2OAc, in which the palladium center is four-coordinate with four nitrogen donors originating from two distinct ligands to form a square-planar geometry. In crystals of both 3 and 4 strong intermolecular edge-to-face C–H···π packing interactions are observed, which contribute to stabilize the crystalline solid. Studies of the photophysical properties of these compounds (3, 4, and ligand 2) show apparent fluorescence quenching effect by introduction of metal ions and likely “excimer” emission of anthracene in the crystalline solid. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Co-reporter:Guoqi Zhang;Shuangqing Wang;Quan Gan;Yongfang Zhang;Jin Shi Ma;Huijun Xu
European Journal of Inorganic Chemistry 2005 Volume 2005(Issue 20) pp:
Publication Date(Web):8 SEP 2005
DOI:10.1002/ejic.200500451
A thiazolylazo dye, 5-(diethylamino)-2-(2-thiazolylazo)phenol (HL), containing potential tridentate binding sites was synthesized in high yield and well characterized. In solution, the reaction of zinc acetate and the deprotonated ligand, L–, results in the instantaneous formation of the supramolecular trinuclear species [Zn3L2(OAc)4] (1). UV/Vis and 1H NMR spectroscopic titration experiments in solution confirmed that the ligand and zinc salt interact spontaneously with each other and produce exclusively the polymetallic complex with the metal-to-ligand ratio of 3:2. The crystal structures of both the ligand and coordination complex are reported in this paper. The aromatic part of HL is planar and, significantly, the intermolecular C–H···π hydrogen bonds and thiazo ring-S···π weak interactions observed here should be responsible for the orthorhombic space group P212121. The structure of 1 reveals a linear trinuclear zinc cluster. The two L– units are linked to three zinc atoms in an N2O tridentate mode, and the four acetate anions are chelated to three metal centers as bridges to result in two pentacoordinate and one hexacoordinate zinc centers. The resulting bridging Zn1–Zn2–Zn1A array is linear by symmetry, with a nonbonding Zn···Zn distance of 3.390 Å and a Zn1···Zn2···Zn1A angle of 180.0°. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
Co-reporter:Xiong Fei;Wang Shuang-Qing;He Li-Ming;Li Sha-Yu;Gan Quan;Zhang Guo-Qi;Li Yi;Yang Guo-Qiang
Chinese Journal of Chemistry 2005 Volume 23(Issue 7) pp:
Publication Date(Web):16 AUG 2005
DOI:10.1002/cjoc.200590811
6-Phenyl-2,2′-bipyridine linked pyrene and anthracene were synthesized and their photophysical properties were measured in different solvents with different polarity. 4-Pyren-1″-yl-6-phenyl-2,2′-bipyridine (Ppbpy) showed significant solvent-dependent properities while 4-anthracen-yl-9″-yl-6-phenyl-2,2′-bipyridine (Apbpy) displayed solvent-independence, although they had similar molecular structure. Because of different twist angle between the arene and aryl-bipyridine, Ppbpy displayed intermixing behaviors of local excited state (1La and 1Lb) and intramolecular charge transfer (ICT), but Apbpy only showed the properties of local excited state 1La.
Co-reporter:Sha-Yu Li;Fei Xiong;Hai-Rong Zhang;Xue-Fang Lu;Yi Li;Guo-Qiang Yang
Chinese Journal of Chemistry 2004 Volume 22(Issue 1) pp:
Publication Date(Web):26 AUG 2010
DOI:10.1002/cjoc.20040220118
Fluorescence quenching processes of poly[2-methoxy-5–(2′ethyl-hexoxy)-p-phenylene vinylene] (MEH-PPV) in solution by electron acceptors, O2 and acid, have been studied. Static quenching of the fluorescence from MEH-PPV by an electron acceptor (DDQ or TCNE) occurs due to electron transfer from MEH-PPV to the electron acceptor and this electron transfer quenching can be promoted by chloroform. Photooxidation takes place in the MEH-PPV solution and singlet oxygen is an intermediate in the photooxidation. according to the results of ESR spectroscopy. Acid also plays an important role in the fluorescence quenching process of MEH-PPV, by the protonation of the alkoxy groups in the molecular chain.
Co-reporter:Liming He, Hong Li, Jiufeng Fan, Shayu Li, Quan Gan, Guoqi Zhang, Baowen Zhang, Yi Li, Guoqiang Yang
Chemical Physics Letters 2003 Volume 378(3–4) pp:263-268
Publication Date(Web):5 September 2003
DOI:10.1016/S0009-2614(03)01335-6
Abstract
An intramolecular electron transfer compound (4-(10-cyano-9-anthracenylmethyl)-N,N-dimethylaniline) has been studied under different pressure up to about 6 GPa. The electron transfer (ET) rate constants (ket) with pressure have been obtained from its fluorescence emission and decay processes at different pressures. By analogy with the theory of optical transition, the free energy change (ΔG) and solvent reorganization energy (λ) during the ET process can be expressed by the functions including the variable pressure. The experimental results can be understood well by analyzing the influence of ΔG and λ on the ket with pressure.
Co-reporter:Liucheng Chen, Haining Li, Xiang Zhu, Lei Su, Kun Yang, Chaosheng Yuan, Guoqiang Yang, Xiaodong Li
Journal of Molecular Structure (5 June 2017) Volume 1137() pp:
Publication Date(Web):5 June 2017
DOI:10.1016/j.molstruc.2017.02.072
•Raman spectroscopy and synchrotron XRD measurement have been employed to investigate [C10MIM][BF4] under high pressure.•It experienced two phase transitions and the polymorphism was discussed in view of conformational isomerism of its cation.•This study contributed to a better understanding of the influence of conformational flexibility on phase behavior for ILs.In situ crystalization of 1-decyl-3-methylimidazolium tetrafluoroborate ([C10MIM][BF4]) from melt has been investigated under high pressure up to 3.4 GPa at room temperature by using Raman spectroscopy and synchrotron X-ray diffraction measurement. Raman spectral analysis indicated that [C10MIM][BF4] experienced two successive phase transitions at about 0.3 GPa and 1.6 GPa. And the polymorphism was also discussed in view of the conformational isomerism of [C10MIM]+ cation between gauche and trans conformers. Notably, liquid-crystal and crystal-crystal phase transitions were further confirmed by synchrotron X-ray diffraction measurement. Moreover, it also indicated that high structural flexibility of the cations with long alkyl chain might have effect on the degree of disorder of pressure-induced crystallization for ionic liquids.
Co-reporter:Qiyun Fang, Jiewei Li, Shayu Li, Ruihong Duan, Shuangqing Wang, Yuanping Yi, Xudong Guo, Yan Qian, Wei Huang and Guoqiang Yang
Chemical Communications 2017 - vol. 53(Issue 42) pp:NaN5705-5705
Publication Date(Web):2017/03/06
DOI:10.1039/C7CC00551B
A series of air-stable triarylphosphine oxide-based thermosensitive ratiometric sensors based on local excited (LE) and charge transfer (CT) emissions have been designed and synthesized. The fluorescence intensity of tri(pyren-1-yl)phosphine oxide exhibits a prominent temperature-dependent feature over a wide temperature range due to thermally populated emissive LE states. The wide ratiometric temperature sensing range and high stability/reversibility in an ambient atmosphere indicate their great potentials in facile and practical applications.
Co-reporter:Lixia Cao, Zhensheng Zhao, Tao Zhang, Xudong Guo, Shuangqing Wang, Shayu Li, Yi Li and Guoqiang Yang
Chemical Communications 2015 - vol. 51(Issue 97) pp:NaN17327-17327
Publication Date(Web):2015/10/06
DOI:10.1039/C5CC07118F
The pH of mitochondria (pHm) has a close relationship with many biological processes. Here we developed a new indicator Mito-pH-1 for the ratiometric fluorescence detection of the mitochondria pH value, which has excellent tolerance to environmental change. And Mito-pH-1 has been used for the first time to monitor the change of pHm under temperature and H2O2 stimuli in living cells.
Co-reporter:Xuan Liu, Shayu Li, Jiao Feng, Yi Li and Guoqiang Yang
Chemical Communications 2014 - vol. 50(Issue 21) pp:NaN2780-2780
Publication Date(Web):2014/01/22
DOI:10.1039/C3CC49147A
A novel triarylboron compound, MPB, exhibiting reversible thermochromic dual-fluorescence in solid-state polymers and in liquid solvents was designed and synthesized. The fluorescent solid-state polymer with MPB can serve as a highly sensitive self-reference temperature indicator with a concentration independent feature.
Co-reporter:Lixia Cao, Xiaoyan Li, Shuangqing Wang, Shayu Li, Yi Li and Guoqiang Yang
Chemical Communications 2014 - vol. 50(Issue 63) pp:NaN8790-8790
Publication Date(Web):2014/06/20
DOI:10.1039/C4CC03716B
A new nanogel indicator (NGI) for ratiometric fluorescent detection of intracellular pH values has been reported. In aqueous solution, the NGI can be used for ratiometric sensing of pH changes with a large hypsochromic shift of 100 nm in the green–red region and reversible. Furthermore, the NGI has been used to calibrate the cytosol pH value in living cells.
Co-reporter:Kaijun Tian, Dehui Hu, Rui Hu, Shuangqing Wang, Shayu Li, Yi Li and Guoqiang Yang
Chemical Communications 2011 - vol. 47(Issue 36) pp:NaN10054-10054
Publication Date(Web):2011/08/09
DOI:10.1039/C1CC13056K
A highly luminescent compound, stilbene-2,4-dimethyl-6-(1,2,2,4-tetramethyl-1,2-dihydroquinolin-6-yl)-1,3,5-s-triazine (MQT), exhibits solvent polarity-induced emission enhancement. A fluorescent sensor array was fabricated with MQT and porous polymer substrates. The colorimetric changes of the array exposed to VOCs can be readily distinguished by the naked eye. Post-processing procedures proved the high selectivity of the array for VOCs.
Co-reporter:Zhiqing Xun, Tianjun Yu, Yi Zeng, Jinping Chen, Xiaohui Zhang, Guoqiang Yang and Yi Li
Journal of Materials Chemistry A 2015 - vol. 3(Issue 24) pp:NaN12971-12971
Publication Date(Web):2015/05/12
DOI:10.1039/C5TA02565F
A series of artificial photosynthesis complexes, Gn–Ir–Hy (n = 1–4), were constructed by attaching iridium complexes and [Fe–Fe]-hydrogenase mimic to the periphery and core, respectively, of poly(aryl ether) dendrimers of different generations. The iridium complexes act as the light-harvesting antennae and the hydrogenase mimic core is the catalytic center. Light-harvesting, photoinduced electron-transfer, and hydrogen photochemical production were hierarchically realized within the dendritic photosynthesis mimics using triethylamine as the sacrificial electron donor. The catalytic activity is enhanced as the generation of dendritic catalysts increases, and the turnover number for generation 4 is nearly 4 times more than that of generation 1. The peripheral antennae not only harvest photons but also act as electronic energy reservoirs for the photochemical production, which facilitates the catalytic process together with the increased light-harvesting and protection effects of dendritic frameworks. Therefore, efficient artificial photosynthesis systems with complete light-harvesting and catalytic functions can be advanced with such rational design.
Co-reporter:Tianjun Yu, Yi Zeng, Jinping Chen, Xiaohui Zhang, Guoqiang Yang and Yi Li
Journal of Materials Chemistry A 2014 - vol. 2(Issue 48) pp:NaN20505-20505
Publication Date(Web):2014/10/31
DOI:10.1039/C4TA04914D
A composite catalyst Hy-pyr/PVP constructed by incorporating a hydrophobic [Fe–Fe]-hydrogenase mimic (Hy-pyr) into the self-crosslinked polyvinylpyrrolidone (PVP) hydrogel has been successfully applied to photocatalytic production of hydrogen in aqueous solution with high catalytic activity and efficiency. The present study provides a general, simple and efficient strategy for the application of water-insoluble catalysts in aqueous solution by using the PVP hydrogel.
Co-reporter:Rui Hu, Shayu Li, Yi Zeng, Jinping Chen, Shuangqing Wang, Yi Li and Guoqiang Yang
Physical Chemistry Chemical Physics 2011 - vol. 13(Issue 6) pp:NaN2051-2051
Publication Date(Web):2010/12/20
DOI:10.1039/C0CP01181A
A few of excited state intramolecular proton transfer (ESIPT) compounds have been discovered for their aggregation induced emission enhancement (AIEE). To understand the AIEE mechanism, an ESIPT compound BTHPB (N-(4-(benzo[d]thiazol-2-yl)-3-hydroxyphenyl)benzamide) with simple structure was designed and synthesized. BTHPB showed apparent AIEE property and the emission efficiency was observed as high as 0.27 in the aggregates. On the basis of viscochromism experiments and calculations employing the linear coupling model, the restriction of the rotation between the two subunits taken place in ESIPT was considered as the main factor for the AIEE. The micro- and femtosecond transient absorption experiments offered evidence for the considerations. Additionally, we also observed a negative effect of aggregation on the fluorescence emission in the system. So the AIEE of ESIPT compound BTHPB originated from the combination effects of positive and negative factors induced by the aggregation.
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