Co-reporter:Yanyan Wang, Bin Li, Liming Zhang, Hang Song, and Ligong Zhang
ACS Applied Materials & Interfaces 2013 Volume 5(Issue 1) pp:11
Publication Date(Web):December 17, 2012
DOI:10.1021/am302492e
We report the facile synthesis and easy operation of a smart delivery system based on core–shell structured magnetic mesoporous silica nanocomposites covalently grafted with light-responsive azobenzene derivatives, which integrates magnetic targeting and stimuli-responsive release property. Irradiation with visible light triggers the release of guest molecules loaded in the mesopores.Keywords: core−shell; drug delivery; light-responsive; magnetic; mesoporous silica; targeting;
Co-reporter:Lianlian Wang, Bin Li, Liming Zhang and Yongshi Luo
Dalton Transactions 2013 vol. 42(Issue 2) pp:459-465
Publication Date(Web):03 Oct 2012
DOI:10.1039/C2DT31808C
A simple organic molecule of 2-naphthol-1-aldehyde-conjugated thiourea (denoted as receptor 1) is designed and prepared. Absorption and fluorescence spectra response profiles of receptor 1 with different ionic inputs vary significantly in a DMSO–H2O solution (V/V = 9:1) through modulating intramolecular charge transfer (ICT) processes. In particular, the changes of the dual-modal spectra when anions, such as F−, AcO− or H2PO4−, are introduced in such an aqueous solution indicate that receptor 1 could be tolerant to H2O at least to some extent in recognizing anions. On the basis of the above results, binary logic operations (OR, NOR and INHIBIT) and their multiply-logic functions with different combinations have been achieved at the molecular level by changing different chemical inputs. The output signals can be encoded as absorption and fluorescence dual-mode, depending on the choice of 2-naphthol as the chromophore and fluorophore core.
Co-reporter:Lianlian Wang, Bin Li, Liming Zhang, Peng Li, Hong Jiang
Dyes and Pigments 2013 Volume 97(Issue 1) pp:26-31
Publication Date(Web):April 2013
DOI:10.1016/j.dyepig.2012.11.021
In this paper, synthesis and photophysical properties of an organoeuropium complex, Eu(DBM)3DPPZ (DBM = dibenzoylmethane, DPPZ = dipyrido [3,2-a:2′,3′-c]phenazine), are described and discussed. The europium complex sensor can efficiently recognize AcO− ion over other anions by the increase of luminescence intensity, which is applicable to naked eye detection for AcO− ion. The sensing mechanism is ascribed to the replacement of DPPZ by AcO− ion. Moreover, the Eu3+ emission is also found to be sensitive to molecular oxygen through a back-energy transfer mechanism. Based on these characters, this “off–on”-type luminescent sensor could successfully mimic an IMP (IMPLICATION) gate at molecular level with AcO− ion and oxygen as inputs. The output of a sharp characteristic Eu3+ emission is read as “0” only in the absence of AcO− ion under oxygen atmosphere. As far as we know, this is the first example of a logic gate corresponding to a two-input IMP function obtained from a europium complex.Graphical abstractHighlights► An organoeuropium complex was designed and synthesized. ► It could be used as an “off–on”-type luminescent sensor for AcO− ion. ► The emission is also found to be sensitive to molecular oxygen. ► It could successfully mimic an IMPLICATION gate at molecular level.
Co-reporter:Xiuli Xie, Xiaopeng Chen, Bin Li, Liming Zhang
Dyes and Pigments 2013 Volume 98(Issue 3) pp:422-427
Publication Date(Web):September 2013
DOI:10.1016/j.dyepig.2013.03.022
•A colorimetric chemosensor for Cu2+ detection was synthesized.•The colorimetric chemosensor allows the “naked-eyes” detection of Cu2+.•The colorimetric chemosensor can mimic an AND logic gate function.•The colorimetric chemosensor can act as a potential probe towards ClO−.A highly-selective colorimetric chemosensor (CS1) for Cu2+ detection is prepared and characterized. This Cu2+ sensor can act as a potential probe towards ClO−, by taking advantage of the oxidation property of hypochlorite and different coordinating property of Cu+ and Cu2+ with CS1. Upon addition of ClO−, the absorption maximum band of CS1 in the presence of Cu+ in CH3CN/H2O (4:1, v/v) shows a large red shift from 398 to 552 nm (Δ = 154 nm), and a visually color change from orange to purple is very easy to observe by naked-eyes, while other commonly-coexisting anions can not induce such similar changes. CS1 mimic an AND logic gate function with Cu+ and ClO− as inputs and A552 nm/A398 nm as output (A = absorbance), and this function can be easily reset by S2−.
Co-reporter:Yang Yang, Bin Li, Liming Zhang
Sensors and Actuators B: Chemical 2013 Volume 183() pp:46-51
Publication Date(Web):5 July 2013
DOI:10.1016/j.snb.2013.03.108
A series of intramolecular charge transfer (ICT) molecules with multiple dicyanovinyl substitutes on triphenylamine were synthesized in good yields by Knoevenagel condensation of corresponding triphenylamine aldehydes and malonodinitrile. Photophysical property of these triphenylamine malonitrile dyes were studied, along with their intriguing solvatochromic behavior. The fluorescence emission of most dyes was highly sensitive to solvent polarity, yielding blue to yellow and even red fluorescence in different organic solvents. Both the fluorescence and the Stokes shifts were linearly dependent on the orientation polarizability (Δf) and empirical polarity parameter ET(30) according to Reichardt–Dimroth equation. Further analysis suggested that the solvatochromic behavior of these dyes was caused by dipole moment change upon excitation from ground to excited state.
Co-reporter:Yanyan Wang, Bin Li, Liming Zhang, and Hang Song
Langmuir 2013 Volume 29(Issue 4) pp:1273-1279
Publication Date(Web):January 4, 2013
DOI:10.1021/la304398c
In this paper, the fabrication, characterization, and application in oxygen sensing are reported for a novel multifunctional nanomaterial of [Ru(bpy)2phen-MMS] (bpy, 2,2′-bipyridyl; phen, phenathrolin) which was simply prepared by covalently grafting the ruthenium(II) polypyridyl compounds into the channels of magnetic mesoporous silica nanocomposites (MMS). Scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption–desorption, a superconducting quantum interference device, UV–vis spectroscopy, and photoluminescence spectra were used to characterize the samples. The well-designed multifunctional nanocomposites show superparamagnetic behavior and ordered mesoporous characteristics and exhibit a strong red-orange metal-to-ligand charge transfer emission. In addition, the obtained nanocomposites give high performance in oxygen sensing with high sensitivity (I0/I100 = 5.2), good Stern–Volmer characteristics (R2 = 0.9995), and short response/recovery times (t↓ = 6 s and t↑ = 12 s). The magnetic, mesoporous, luminescent, and oxygen-sensing properties of this multifunctional nanostructure make it hold great promise as a novel multifunctional oxygen-sensing system for chemical/biosensor.
Co-reporter:Lin-Fang Shi, Bin Li, Li-Ming Zhang, Qing-Hui Zuo, Shumei Yue
Inorganica Chimica Acta 2013 400() pp: 91-98
Publication Date(Web):
DOI:10.1016/j.ica.2013.02.020
Co-reporter:Jin Zhang, Bin Li, Liming Zhang and Hong Jiang
Chemical Communications 2012 vol. 48(Issue 40) pp:4860-4862
Publication Date(Web):23 Mar 2012
DOI:10.1039/C2CC31642K
The first optical sensor for Cu(II) detection, with upconverting luminescent nanoparticles as an excitation source, showing high selectivity and good linear Stern–Volmer characteristics, has been achieved through a fluorescence resonance energy transfer (FRET) process between NaYF4:Yb3+/Er3+ and RB-hydrazide. The sensing mechanism is then discussed.
Co-reporter:Xiaorong Guo, Bin Li, Liming Zhang, Yinghui Wang
Journal of Luminescence 2012 Volume 132(Issue 7) pp:1729-1734
Publication Date(Web):July 2012
DOI:10.1016/j.jlumin.2012.01.049
Novel pyrene functionalized mesoporous core–shell structured silica (denoted as SiO2@mSiO2/Py-Si) was designed and synthesized as a highly selective fluorescent chemosensor for detecting Hg2+ in water. The core–shell structured silica was prepared by a simple sol–gel process through coating SiO2 nanospheres with a layer of ordered mesoporous silica. The surface of outer mesoporous silica shell was then further functionalized by the fluorescent chromophore alkoxysilane modified pyrene (Py-Si). XRD data confirmed that the hexagonal ordered mesoporous structure was preserved after functionalization. The chemosensing material successfully exhibited a remarkable “turn on” response toward Hg2+ over miscellaneous metal ions. A good linear response towards Hg2+ in the concentration range of 10−8–10−4 M was constructed with R2=0.9913. Most importantly, a satisfactory detection limit of 3.4×10−9 g mL−1 (down to ppb level) was obtained, which is 100 times lower than our previous report of covalently grafted Py-OH to the bulk mesoporous silica SBA-15. These results indicated that SiO2@mSiO2/Py-Si can be used as a highly selective and sensitive fluorescence sensor for Hg2+.Highlights► Pyrene functionalized mesoporous core–shell structured silica was synthesized. ► It is explored as a fluorescent chemosensor for detecting Hg(II). ► A good linear response towards Hg(II) was obtained. ► A detection limit of 3.4×10−9 g mL−1 (down to ppb level) was realized.
Co-reporter:Liming Zhang, Shumei Yue, Bin Li, Di Fan
Inorganica Chimica Acta 2012 Volume 384() pp:225-232
Publication Date(Web):1 April 2012
DOI:10.1016/j.ica.2011.12.002
In this paper, we report a series of [Cu(N–N)(P–P)]BF4 complexes based on two phosphorous ligands and three 1,10-phenanthrolin derived diimine ligands, including their syntheses, characterizations, crystal structures. Their photophysical properties were experimentally measured and theoretically analyzed by time-dependent density functional theory (TD-DFT). It is found that the introduction of too many fused phenyl rings into diimine ligand leads to luminescence absence of corresponding [Cu(N–N)(P–P)]+ complexes at room temperature. A detailed analysis suggests that the thermal activated electron-configuration transformation between the [Cu(N–N)(P–P)]+ triplet metal-to-ligand-charge-transfer (3MLCT) state and the lowest lying excited state of its diimine ligand (3LC) is responsible for the luminescence quenching.Graphical abstractA series of Cu(I) complexes have been synthesized and studied. It is found that luminescence can be quenched by the thermal activated electron-configuration transformation in excited state Cu(I) complexes.Highlights► A series of [Cu(N–N)(P–P)]BF4 are synthesized and studied in detail. ► Photophysical properties are measured and analyzed in detail. ► Excess phenyl rings in diimine ligand leads to luminescence absence. ► The electron-configuration transformation is the luminescence quencher.
Co-reporter:Peng Li, Bin Li, Liming Zhang, Jie Gao, Haifeng Zhao
Chemical Physics Letters 2012 Volume 542() pp:106-109
Publication Date(Web):23 July 2012
DOI:10.1016/j.cplett.2012.06.002
Abstract
Here, an asymmetric porphyrin derivative of 5-(4-aminophenyl)-10, 15, 20-triphenyl-porphyrin (H2ATPP) has been successfully covalently connected to photo-permeable mesoporous silica thin films as a unit to mimic logic function. This hybrid mesoporous structure is not only advantageous to the interaction between inputs and response materials, but also to separation of the response materials and inputs without information lost. Then several molecular logics with the function of memory, based on its characteristic of being sensitive to acid and base, are achieved. With different initial states, it could be handily described as feedback loop and RS-latch for sequential logic.
Co-reporter:Yanyan Wang, Bin Li, Liming Zhang, Peng Li, Lianlian Wang, and Jin Zhang
Langmuir 2012 Volume 28(Issue 2) pp:1657-1662
Publication Date(Web):December 20, 2011
DOI:10.1021/la204494v
In the present work, a multifunctional inorganic–organic hybrid nanomaterial (MMS–Py) was prepared by the immobilization of a pyrene-based receptor (Py) within the channels of magnetic mesoporous silica nanocomposites (MMS), and characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, N2 adsorption/desorption, superconducting quantum interference device, and photoluminescence spectra. This multifunctional nanomaterial exhibits superparamagnetic behavior, ordered mesoporous characteristics, and significantly improved fluorescence sensing properties that allow for highly sensitive and reproducible Hg2+ detection. The fluorogenical responses of MMS-Py are stable over a broad pH range. A detection limit of 1.72 ppb is obtained, which is 2 orders of magnitude lower than that based on bulk mesoporous materials. Additionally, this nanomaterial shows high performance in convenient magnetic separability and efficient removal of Hg2+. These results indicate that these multifunctional nanocomposites may find potential applications for simple detection and easy removal of Hg2+ in biological, toxicological, and environmental areas.
Co-reporter:Shuli Wang;Bin Li;Lina Liu;Yinghui Wang
Applied Organometallic Chemistry 2011 Volume 25( Issue 1) pp:21-26
Publication Date(Web):
DOI:10.1002/aoc.1682
Abstract
SiO2 nanospheres coated with silica chemically doped with a ruthenium complex [Ru(Bphen)2PhenSi]Cl2 (denoted as Ru, there Bphen = 4,7-diphenyl-1,10-phenanthrolin, PhenSi = modified 1,10-phenathroline) were prepared using a simple solution-based method. Field-emission scanning electron microscopy (FE-SEM) showed that the pure SiO2 nanospheres with a mean diameter of ∼185 nm were successfully coated with Ru complex–chemically doped SiO2 shell with a thickness of ∼45 nm. The obtained core-shell nanosphere materials exhibited bright red triplet metal-to-ligand charge transfer (3MLCT) emission, and their photoluminescent intensity was sensitive to oxygen concentration. These properties make them promising candidates for biomarkers and optical oxygen sensors, which can measure the O2 concentration in biological fluids. Copyright © 2010 John Wiley & Sons, Ltd.
Co-reporter:Dr. Yinghui Wang ; Bin Li;Qinghui Zuo ;Peng Li ;Dr. Jun Zhang; Zhongmin Su
ChemPhysChem 2011 Volume 12( Issue 2) pp:349-355
Publication Date(Web):
DOI:10.1002/cphc.201000884
Abstract
An optical oxygen sensor based on an EuIII complex/polystyrene (PS) composite nanofibrous membrane is prepared by electrospinning. The emission intensity of [Eu(TTA)3(phencarz)] (TTA=2-thenoyltrifluoroacetonate, phencarz=2-(N-ethylcarbazolyl-4)imidazo[4,5-f]1,10-phenanthroline) decreases with increasing oxygen concentration, and thus the [Eu(TTA)3 (phencarz)]/PS composite nanofibrous membranes can be used as an optical oxygen-sensing material based on emission quenching caused by oxygen. Elemental analysis, UV/Vis absorption spectra, scanning electron microscopy (SEM), fluorescence microscopy, luminescence-intensity quenching Stern–Volmer plots, and excited-state decay analysis are used to characterize the obtained oxygen-sensing materials. A high sensitivity (IN2/IO2) of 3.38 and short response and recovery times (t=5.0, t=8.0 s) are obtained. These results are the best values reported for oxygen sensors based on EuIII complexes. The high surface area-to-volume ratio and porous structure of the electrospun nanofibrous membranes are taken to be responsible for the outstanding performance.
Co-reporter:Yinghui Wang, Bin Li, Liming Zhang, Qinghui Zuo, Lina Liu, Peng Li
Journal of Colloid and Interface Science 2010 Volume 349(Issue 2) pp:505-511
Publication Date(Web):15 September 2010
DOI:10.1016/j.jcis.2010.05.047
A series of novel organic–inorganic hybrid materials with a Eu(III) complex [(C2H5)4N][Eu(DBM)3(DBM-OH)] (DBM = dibenzoylmethanate, DBM-OH = p-hydroxydibenzoylmethanate) covalently bonded into vinyl-modified silica networks have been successfully assembled through a sol–gel process. DBM-OH was grafted to the coupling agent 3-(triethoxysilyl)propylisocyanate (TESPIC), and the as-obtained molecular precursor DBM-Si was used as a bridge molecule both coordinate to Eu3+ and forming an inorganic Si–O network with tetraethoxysilane (TEOS) and vinyltriethoxysilane (VTES) after cohydrolysis and co-condensation processes. The luminescence properties of VTES/TEOS composite hybrid materials were systematically studied in comparison to those of TEOS-derived hybrid material and pure [(C2H5)4N][Eu(DBM)4], respectively. The results indicate that the luminescent quantum efficiencies of VTES/TEOS composite hybrid materials are greatly improved. And it is interesting to find that the luminescent intensity of VTES/TEOS composite hybrid material is enhanced by optimizing the molar ratio of VTES to TEOS (VTES:TEOS = 4:6) by 3.3 and 2.4 times compared with TEOS-derived hybrid material and pure [(C2H5)4N][Eu(DBM)4], respectively. In addition, the thermal stability of the emission was also improved considerably. The results presented in this paper indicate that the use of vinyl-modified silicates as a matrix opens the door to improving the photoluminescence properties of Eu(III) complexes.A novel Eu(III) complex has been covalently immobilized by ORMOSILs, and the luminescent intensity and emission quantum efficiency of the composite hybrid materials are improved considerably.
Co-reporter:Dan Wang, Bin Li, Liming Zhang, Jun Ying, Xiudong Wu
Journal of Luminescence 2010 Volume 130(Issue 4) pp:598-602
Publication Date(Web):April 2010
DOI:10.1016/j.jlumin.2009.11.002
In this paper, a novel luminescent organic–inorganic hybrid material containing covalently bonded ternary europium complex in mesoporous silica MCM-41 has been successfully prepared by co-condensation of tetrethoxysilane (TEOS) and the modified ligand 2-phenyl-1H-imidazo[4,5-f][1,10]phen-3-(triethoxysilyl)propylcarbamate (PIP-Si) in the presence of cetyltrimethylammonium bromide (CTAB) surfactant as template. PIP-Si containing 1,10-phenanthroline covalently grafted to 3-(triethoxysilyl)propyl isocyanate is used not only as a precursor but also as the second ligand for Eu(TTA)3·2H2O (TTA: 2-thenoyltrifluoroacetate) complex to prepare a novel functionalized mesoporous material. The resulted mesoporous composite materials, which demonstrate strong characteristic emission lines of Eu3+5D0-7FJ (J=0, 1, 2, 3, 4), were characterized by Fourier transform infrared (FT-IR), small-angle X-ray diffraction, excited-state decay analysis. Emission intensity of the Eu(III) complex covalently linked to MCM-41 (Eu-MCM-41) increases with the increasing irradiation time, demonstrating better photostability compared with both pure Eu(III) complex and physically incorporated sample.
Co-reporter:Xu Sun, Bin Li, Luting Song, Jian Gong, Liming Zhang
Journal of Luminescence 2010 Volume 130(Issue 8) pp:1343-1348
Publication Date(Web):August 2010
DOI:10.1016/j.jlumin.2010.02.024
1D composite nanofibers of poly(vinylpyrrolidone) (PVP, MW≈60,000) doped with three Er(III) complexes were prepared by electrospinning. They demonstrated strong near-infrared (NIR) photoluminescence (PL) at 1535 nm and ternary Er(TTA)3Phen (denoted as Er2, where TTA=2-thenoyltrifluoroacetonate; Phen=1,10-phenanthroline) fibers (Er2/PVP) exhibited maximum PL intensity. The crystal structure of Er2 complex has been determined by X-ray diffraction measurements. Er2 doped in fibers exhibited better thermal stability of NIR PL than the pure Er2 complex. These luminescent composite fibers have potential application in optical amplifiers.
Co-reporter:Qinghui Zuo, Bin Li, Liming Zhang, Yinghui Wang, Yanhong Liu, Jun Zhang, Ying Chen, Lifan Guo
Journal of Solid State Chemistry 2010 Volume 183(Issue 7) pp:1715-1720
Publication Date(Web):July 2010
DOI:10.1016/j.jssc.2010.05.022
A novel Eu3+ complex of Eu(DPIQ)(TTA)3 (DPIQ=10H-dipyrido [f,h] indolo [3,2-b] quinoxaline, TTA=2-thenoyltrifluoroacetonate) was synthesized and encapsulated in the mesoporous MCM-41, hoping to explore an oxygen-sensing system based on the long-lived Eu3+ emitter. The Eu(DPIQ)(TTA)3/MCM-41 composites were characterized by infrared spectra (IR), ultraviolet-visible (UV–vis) absorption spectra, small-angle X-ray diffraction (SAXRD), luminescence intensity quenching upon various oxygen concentrations, and fluorescence decay analysis. The results indicated that the composites exhibited the characteristic emission of the Eu3+ ion and the fluorescence intensity of 5D0–7F2 obviously decreased with increasing oxygen concentrations. The oxygen sensing properties of the composites with different loading levels of Eu(DPIQ)(TTA)3 complex were investigated. A sensitivity of 3.04, a short response time of 7 s, and good linearity were obtained for the composites with a loading level of 20 mg/g. These results are the best reported values for optical oxygen-sensing materials based on Eu3+ complexes so far.Novel optical oxygen-sensing composites are prepared by incorporating a novel Eu3+ complex Eu(DPIQ)(TTA)3 into MCM-41. The emission intensity of Eu(DPIQ)(TTA)3/MCM-41 composites exhibits a strong oxygen dependent characteristic and the composite with a loading level of 20 mg/g possesses better fluorescence quenching with increasing oxygen concentrations.
Co-reporter:Liming Zhang, Bin Li, Zhongmin Su, Shumei Yue
Sensors and Actuators B: Chemical 2010 Volume 143(Issue 2) pp:595-599
Publication Date(Web):7 January 2010
DOI:10.1016/j.snb.2009.09.056
In this paper, we report the synthesis, characterization, and Fe(III)-sensing properties of two easily synthesized rare-earth(III)-based emitters, Na3Eu(PDA)3 and Na3Tb(PDA)3. Results suggest that the two emitters exhibit high sensitivity and linear spectral response towards Fe(III) (Stern–Volmer constant = 2.21 × 104 L/mol, linearity = 0.988). In addition, the two emitters are oxygen- and temperature-insensitive, making themselves promising candidates to be utilized in actual applications.
Co-reporter:Yinghui Wang, Bin Li, Yanhong Liu, Liming Zhang, Qinghui Zuo, Linfang Shi and Zhongmin Su
Chemical Communications 2009 (Issue 39) pp:5868-5870
Publication Date(Web):12 Aug 2009
DOI:10.1039/B910305H
The first optical oxygen sensor based on Cu(I) complex–polystyrene composite nanofibrous membranes, showing high sensitivity (I0/I100 = 15.56), good linear Stern–Volmer characteristics (R2 = 0.9966) and short response/recovery time (t↓ (s) = 7 and t↑ (s) = 14), has been prepared; these results represent the best values reported for oxygen sensors based on Cu(I) complexes.
Co-reporter:Linfang Shi;Bin Li
European Journal of Inorganic Chemistry 2009 Volume 2009( Issue 15) pp:2294-2302
Publication Date(Web):
DOI:10.1002/ejic.200900123
Abstract
Five novel copper(I) complexes with the general formula [Cu(dpephos)(NN)]BF4 {dpephos = bis[2-(diphenylphosphanyl)phenyl] ether, NN = 2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline (pip, 1), 1-ethyl-2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline (epip, 2), 2-(naphthalen-1-yl)-1H-imidazo[4,5-f][1,10]phenanthroline (nip, 3), 1-ethyl-2-(naphthalen-1-yl)-1H-imidazo[4,5-f][1,10]phenanthroline (enip, 4), 2-(anthracen-9-yl)-1-ethyl-1H-imidazo[4,5-f][1,10]phenanthroline (aeip, 5)} were rationally designed and synthesized, and these complexes were characterized by 1H NMR and IR spectroscopy and elemental analysis. X-ray crystal-structure analysis of 3 and 4 are also presented. Their photophysical properties at room temperature were examined by using a combination of cyclic voltammetry and electronic absorption spectroscopy. It was found that 1–4 display broad-band emission in the solid state upon excitation at λ = 400 nm, and the emission maxima are located in the range 530–558 nm; the excited-state lifetimes of these complexes are 8.24, 1.97, 6.99, and 2.43 μs, respectively. As a result, the emission intensity of complexes 1–4 is sensitive to oxygen concentration, and they display oxygen-sensing properties after they are encapsulated into mesoporous silica MCM-41 or SBA-15.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Co-reporter:Liming Zhang, Bin Li
Journal of Luminescence 2009 Volume 129(Issue 11) pp:1304-1308
Publication Date(Web):November 2009
DOI:10.1016/j.jlumin.2009.06.015
In this paper, a series of Eu(III)complexes with a novel triphenylamine-derived beta-diketone ligand are synthesized. Systematical research reveals that these Eu(III) complexes take an occasional antenna mechanism by transferring energy between singlet state of ligand and central Eu(III), which leads to much shortened excited state lifetimes of the corresponding Eu(III) complexes.
Co-reporter:Zhenjun Si, Jiang Li, Bin Li, Shiyong Liu, Wenlian Li
Journal of Luminescence 2009 Volume 129(Issue 3) pp:181-186
Publication Date(Web):March 2009
DOI:10.1016/j.jlumin.2008.09.014
Three novel Cu(I) complexes, [CuDPEphos(NN)]BF4, where NN=1-(4-5′-phenyl-1,3,4-oxadiazolylbenzyl)-2-pyridinylbenzoimidazole (OXD–Pybm; L1) (1), 1-(4-carbazolylbutyl)-2-pyridinylbenzimidazole (Carl–Pybm; L2) (2), and 1-H-2-pyridinylbenzimidazole (HPybm; L3) (3), were synthesized. The photoluminescent (PL) properties of 1–3 and the electroluminescent (EL) properties of complexes 1 and 2 were systematically studied. The maximum brightness of 2-based devices was 8669 cd/m2, which should be the best among the reported Cu(I) complexes-based devices.
Co-reporter:Lin Fang Shi, Bin Li, Li Ying Zhang
Chinese Chemical Letters 2009 Volume 20(Issue 9) pp:1047-1050
Publication Date(Web):September 2009
DOI:10.1016/j.cclet.2009.03.017
A blue light-emitting material, 2-(N-ethyl-anthraceneyl-9) imidazo [4,5-f] 1,10-phenanthroline (EAIP), has been synthesized and characterized by 1H NMR, IR, elemental and single crystal X-ray diffraction analysis. The results of theoretical calculations indicate that the HOMO and LUMO distributions mainly locate at the anthracene fragment. It displays bright blue emission in both solid state and dichloromethane solution. The emission quantum yield calculated is 0.76.
Co-reporter:Liming Zhang, Bin Li
Inorganica Chimica Acta 2009 Volume 362(Issue 14) pp:4857-4861
Publication Date(Web):10 November 2009
DOI:10.1016/j.ica.2009.07.012
In this paper, a series of 4,5-diazafluoren-9-one-derived (Dafo-derived) diimine ligands and their corresponding Cu(I) complexes with bis(2-(diphenylphosphanyl)phenyl) ether as the auxiliary ligand are synthesized. Relationships between diimine ligands and photophysical properties of their corresponding Cu(I) complexes are discussed in detail. It is found that the introduction of an electron-donor moiety into one diimine ligand leads to a dramatic red shift of the absorption of corresponding Cu(I) complex, while, an electron-acceptor moiety demonstrates no obvious effect on Cu(I) complex absorption when introduced into diimine ligand. In addition, it is found that the intraligand charge transfer of Dafo-derived ligands acts as an efficient luminescence quencher within their corresponding Cu(I) complexes, leading to luminescence absence from metal-to-ligand-charge-transfer (MLCT) excited state.A series of 4,5-diazafluoren-9-one-derived (Dafo-derived) diimine ligands and their corresponding Cu(I) complexes with bis(2-(diphenylphosphanyl)phenyl) ether as the auxiliary ligand: relationships between diimine ligands and photophysical properties of their corresponding Cu(I) complexes are discussed in detail.
Co-reporter:Linfang Shi;Bin Li;Shaozhe Lu;Dongxia Zhu;Wenlian Li
Applied Organometallic Chemistry 2009 Volume 23( Issue 10) pp:379-384
Publication Date(Web):
DOI:10.1002/aoc.1522
Abstract
A novel luminescent copper(I) complex with formula [Cu(PPh3)2(PIP)]BF4 (PPh3 = triphenyl phosphine, PIP = 2-phenyl-1H-imidazo[4,5-f][1,10]phenanthroline) has been synthesized and characterized by 1H NMR, IR, elemental analysis and X-ray crystal structure analysis. In solid state, it displays broad band emission upon excitation at λ = 420 nm with the emission maximum locates at 551 nm. Its excited-state lifetime is in the microsecond time scale (3.02 µs); as a result, its emission intensity is sensitive to oxygen concentration and shows oxygen-sensing properties after being encapsulated into mesoporous silica MCM-41. For the system with 60 mg/g loading level, a sensitivity (I0/I) of 4.35, a fluorescence quenching time (tQ) of 5 s and a recovery time (tR) of 36 s were achieved. Even after aging for 5 months, the sensitivities of the three loading level systems can be retained, ignoring the measurement error, which indicates that they possess long-term stability. Copyright © 2009 John Wiley & Sons, Ltd.
Co-reporter:Lina Liu, Bin Li, Jin Zhang, Ruifei Qin, Haifeng Zhao, Xinguang Ren
Materials Research Bulletin 2009 44(11) pp: 2081-2086
Publication Date(Web):
DOI:10.1016/j.materresbull.2009.07.010
Co-reporter:Linfang Shi, Bin Li, Sumei Yue, Di Fan
Sensors and Actuators B: Chemical 2009 Volume 137(Issue 1) pp:386-392
Publication Date(Web):28 March 2009
DOI:10.1016/j.snb.2008.12.039
A novel copper(I) complex [Cu(POP)(PTZ)]BF4 (POP = bis[2-(diphenyl-phosphino)phenyl]-ether, PTZ = 5-(2-pyridyl)tetrazole) has been synthesized and characterized by elemental analysis, 1H NMR and IR. Complex [Cu(POP)(PTZ)]BF4 shows bright bluish-green emission centered at 495 nm in solid-state at room temperature, arising from metal to ligand charge-transfer (MLCT) transition. The photoluminescence quantum yield measured in air is 0.12. The excited state lifetime of [Cu(POP)(PTZ)]BF4 is on the order of microsecond indicating the presence of phosphorescent emission. The emission intensity of [Cu(POP)(PTZ)]BF4 appears to be highly sensitive to the O2 concentration, meaning it possesses oxygen-sensing property. The sensing performances of [Cu(POP)(PTZ)]BF4/MCM-41 composite materials are evaluated and the system with 20 mg/g loading level exhibits the best sensitivity (I0/I100 > 11), and the shortest response time (t↓ < 5 s), which is attractive because copper(I) complexes are nontoxic and can be prepared at a fraction of the cost of noble metal-based ones.
Co-reporter:Xiudong Wu;Yan Cong;Yanhong Liu;Jun Ying
Journal of Sol-Gel Science and Technology 2009 Volume 49( Issue 3) pp:355-363
Publication Date(Web):2009 March
DOI:10.1007/s10971-008-1866-1
A series of VTES/TEOS composite xerogels covalently grafted with a novel complex Ru(phen)2(Dppz-Si)Cl2 were prepared, using the alkoxysilane-modified dipyrido[3,2-a:2′,3′-c]phenazine compound (denoted as Dppz-Si) as the second ligand of the Ru(phen)2Cl2 (phen = 1,10-phenanthroline) complex and a precursor of the sol–gel process. Bulk xerogels were obtained by co-hydrolyzing and co-condensation from a mixture of triethoxysilane (TEOS), Ru(phen)2(Dppz-Si)Cl2 and Vinyltriethoxysilane (VTES). The luminescence intensity of composite xerogels is enhanced by 18.2 times, and the sensitivity is improved from 1.1 to 3.1 by optimizing the molar ratio of VTES to TEOS. The composite xerogel containing 80% VTES in precursor was optimal, exhibiting the maximum luminescence intensity and sensitivity. These results indicate that the complex Ru(phen)2(Dppz-Si)Cl2 is sensitive to oxygen concentration, VTES is a kind of excellent organic modifier and can greatly improved photoluminescent (PL) and oxygen sensing performances.
Co-reporter:Liming Zhang, Bin Li
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2009 Volume 74(Issue 5) pp:1060-1063
Publication Date(Web):December 2009
DOI:10.1016/j.saa.2009.09.007
In this paper, an optical sensor, 2,6-bis(2-benzimidazolyl)pyridine, is reported to be highly selective towards aniline. A unique spectral response of 2,6-bis(2-benzimidazolyl)pyridine towards aniline is found, and a linear relationship between the sensor's emission intensity and the aniline's concentration is observed, making 2,6-bis(2-benzimidazolyl)pyridine a promising candidate for practicable optical sensors of aniline recognition.
Co-reporter:Lianlian Wang, Bin Li, Liming Zhang and Yongshi Luo
Dalton Transactions 2013 - vol. 42(Issue 2) pp:NaN465-465
Publication Date(Web):2012/10/03
DOI:10.1039/C2DT31808C
A simple organic molecule of 2-naphthol-1-aldehyde-conjugated thiourea (denoted as receptor 1) is designed and prepared. Absorption and fluorescence spectra response profiles of receptor 1 with different ionic inputs vary significantly in a DMSO–H2O solution (V/V = 9:1) through modulating intramolecular charge transfer (ICT) processes. In particular, the changes of the dual-modal spectra when anions, such as F−, AcO− or H2PO4−, are introduced in such an aqueous solution indicate that receptor 1 could be tolerant to H2O at least to some extent in recognizing anions. On the basis of the above results, binary logic operations (OR, NOR and INHIBIT) and their multiply-logic functions with different combinations have been achieved at the molecular level by changing different chemical inputs. The output signals can be encoded as absorption and fluorescence dual-mode, depending on the choice of 2-naphthol as the chromophore and fluorophore core.
Co-reporter:Yinghui Wang, Bin Li, Yanhong Liu, Liming Zhang, Qinghui Zuo, Linfang Shi and Zhongmin Su
Chemical Communications 2009(Issue 39) pp:
Publication Date(Web):
DOI:10.1039/B910305H
Co-reporter:Jin Zhang, Bin Li, Liming Zhang and Hong Jiang
Chemical Communications 2012 - vol. 48(Issue 40) pp:NaN4862-4862
Publication Date(Web):2012/03/23
DOI:10.1039/C2CC31642K
The first optical sensor for Cu(II) detection, with upconverting luminescent nanoparticles as an excitation source, showing high selectivity and good linear Stern–Volmer characteristics, has been achieved through a fluorescence resonance energy transfer (FRET) process between NaYF4:Yb3+/Er3+ and RB-hydrazide. The sensing mechanism is then discussed.
![Phenol, 2-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-](/data/chemimg/3726600/256525-24-3.png)
![Phenol, 2-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-](/data/chemimg/3726600/256525-24-3_b.png)
![Spiro[1H-isoindole-1,9'-[9H]xanthen]-3(2H)-one, 2-amino-3',6'-bis(diethylamino)-](/data/chemimg/659200/74317-53-6.png)
![Spiro[1H-isoindole-1,9'-[9H]xanthen]-3(2H)-one, 2-amino-3',6'-bis(diethylamino)-](/data/chemimg/659200/74317-53-6_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)
