Co-reporter:Lingxiao Xu, Bin Wang, Wenmei Gao, Lixin Wu and Lihua Bi
Journal of Materials Chemistry A 2015 vol. 3(Issue 8) pp:1732-1737
Publication Date(Web):22 Dec 2014
DOI:10.1039/C4TC02774D
For exploration of the effects of tungstophosphate structures on electrochemically induced fluorescence switchable behaviors, four composite films consisting of tris(1,10-phenanthroline) ruthenium (Ruphen) and tungstophosphates with different structures (PW: [PW12O40]3− (PW12), [P2W18O62]6− (P2W18), [NaP5W30O110]14− (P5W30), and [H7P8W48O184]33− (P8W48)) were prepared by the layer-by-layer self-assembly method under identical conditions. The composite films were characterized by cyclic voltammetry, UV-vis spectroscopy, X-ray photoelectron spectroscopy, fluorescence spectroscopy and atomic force microscopy. In situ fluorescence spectroelectrochemical measurements display that the fluorescence quenching efficiencies of the four composite films under electrochemical stimulation depend on the tungstophosphate structures, demonstrating that the desired electrochemically induced fluorescent switchable materials can be optimized by the choice of different polyoxometalates.
Co-reporter:Bin Wang, Wenmei Gao, Yingyi Ma, Dan Li, Lixin Wu and Lihua Bi
RSC Advances 2015 vol. 5(Issue 52) pp:41814-41819
Publication Date(Web):16 Apr 2015
DOI:10.1039/C5RA05097A
Highly transparent flexible tricomponent hybrid film, agarose–[P5W30O110]15−–fluorescein (AG–P5W30–FL), was successfully prepared by a facile hydrogel casting technique. Due to the incorporation of P5W30 this film displays enhanced sensitivity and reversibility of color and emission switching for HCl and NH3 gases.
Co-reporter:Bin Wang, Yingyi Ma, Shan Wang, Liying Zhang, Jing Liang, Haolong Li, Lixin Wu and Lihua Bi
Journal of Materials Chemistry A 2014 vol. 2(Issue 22) pp:4423-4427
Publication Date(Web):04 Mar 2014
DOI:10.1039/C3TC32306D
In this study, three hybrid films {[(PEI/P5W30)m/(PEI/PSS/PEI/GO@F)]n(PEI/P5W30)m} (m = 1, 3, 5; n = 15, 17, 18) (P5W30: [P5W30O110]15−; GO: graphene oxide; F: fluorescein) with green fluorescence have been successfully fabricated through a suitable structural design and alternate assembly of selected components. The fluorescence of the hybrid films can be reversibly switched by the electrochromism of the P5W30 component upon electrochemical modulation while the hybrid films display structural stability against the electrochemical process.
Co-reporter:Rui-Qi Meng;Bin Wang;Hui-Min Sui;Bao Li;Wei Song;Li-Xin Wu;Bing Zhao ;Li-Hua Bi
European Journal of Inorganic Chemistry 2013 Volume 2013( Issue 10-11) pp:1935-1942
Publication Date(Web):
DOI:10.1002/ejic.201201037
Abstract
A ruthenium complex, KNa[Ru2(C6H6)2(CH3COO)6] (Ru-KNa), and its polyoxotungstate derivative, Na6[{Ru(C6H6)}2W8O28(OH)2]·16H2O (Ru-Na), have been successfully isolated from routine synthetic reactions and characterized by X-ray single-crystal structure analysis, IR spectroscopy and elemental analysis. A remarkable aspect of Ru-KNa is that it has two ligand types, benzene and acetate, and the acetate ligands are connected exclusively by a central Na cation to form a dimeric sandwich-type structure, which is further connected by K cations to construct the 3D structures. Based on complex Ru-KNa, the compound Ru-Na was synthesized, and it consists of two {Ru(C6H6)} units linked to a [W8O28(OH)2]10– fragment by three Ru–O(W) bonds to result in an assembly with idealized C2 symmetry in which the polyanions form 3D structures by the connection of Na chains. Subsequently, the compound Ru-Na was anchored on (3-aminopropyl)triethoxysilane (apts) modified SBA-15 to prepare the solid catalysts, which were characterized by powder XRD, N2 adsorption measurements and FTIR spectroscopy. Finally, the catalytic efficiency of Ru-Na was assessed in the oxidation of n-hexadecane with air without any additives and solvents. The results indicated that Ru-Na is a heterogeneous catalyst and exhibits higher catalytic activity than previously reported Ru-containing polyoxotungstates.
Co-reporter:Bin Wang, Rui-Qi Meng, Ling-Xiao Xu, Li-Xin Wu and Li-Hua Bi
Analytical Methods 2013 vol. 5(Issue 4) pp:885-890
Publication Date(Web):05 Dec 2012
DOI:10.1039/C2AY26217G
In this paper, we describe a novel detection of nitrite, iodate and bromate in solutions through combining the electrochemistry and the redox reaction accompanying the color change and luminescence switching based on Eu3+-containing tungstogermanate [(CH3)4N]2.5H7.5[Eu(GeW11O39)(H2O)2]2·4.5H2O (Eu-POM) for the first time. Eu-POM was electroreduced to form the reduced Eu-POM accompanied by a color change from colorless to blue and luminescence quenching, while the discoloration and luminescence recovery were observed after the addition of nitrite, iodate and bromate because of the spontaneous redox reactions of nitrite, iodate and bromate with the reduced Eu-POM. Based on this observation, we investigated the changes of absorbances and luminescence intensities of the reduced Eu-POM with the concentrations of nitrite, iodate and bromate and obtained good linear ranges and lower detection limits for the three substances based on S/N = 3. This method successfully combines the electrochromic and luminescent properties of polyoxometalate to develop a novel detection of nitrite, iodate and bromate with good reversibility and high sensitivity as well as a wide linear range. Therefore, such as system shows great potential for the detection of nitrite, iodate and bromate.
Co-reporter:Ya-Yan Bao, Bin Wang, Rui-Qi Meng, Li-Hua Bi and Li-Xin Wu
CrystEngComm 2012 vol. 14(Issue 5) pp:1550-1553
Publication Date(Web):12 Jan 2012
DOI:10.1039/C2CE05333K
We report for the first time a simple one-step procedure to synthesize the bamboo joint-like gold microstructures in water at room temperature with the wheel-shaped VV–VIV mixed-valence tungstovanadate [P8W48O184{V4VV2IVO12(H2O)2}2]32− (V12) acting as both reducing and stabilizing agent.
Co-reporter:Bin Wang, Li-Hua Bi and Li-Xin Wu
Journal of Materials Chemistry A 2011 vol. 21(Issue 1) pp:69-71
Publication Date(Web):08 Nov 2010
DOI:10.1039/C0JM03140B
We have fabricated an organic/inorganic hybrid thin film based on a Dawson-type polyoxometalate P2W18O626− (P2W18) and a luminescent transition metal complex tris(2,2′-bipyridine)ruthenium [Ru(bpy)3]2+ (Rubpy) by using a layer-by-layer assembly technique, which functions as an electroswitchable fluorescent device operated by electrochemical stimulation.
Co-reporter:Bin Wang, Rui-Qi Meng, Li-Hua Bi and Li-Xin Wu
Dalton Transactions 2011 vol. 40(Issue 19) pp:5298-5301
Publication Date(Web):05 Apr 2011
DOI:10.1039/C1DT10259A
In this paper, we attempt to construct a simple and sensitive detection method for hydrogen peroxide based on reversible colour change and luminescence switching modulated by the electrochemical stimulation and redox reaction of H2O2 with electroreduced polyoxometalate. This method successfully combines the electrochromic and luminescent properties of the polyoxometalate to develop a novel detection method for H2O2 with good reversibility, which displays high sensitivity, a wide linear range and a low detection limit to H2O2.
Co-reporter:Bin Wang, Guang-Feng Hou, Rui-Qi Meng, Li-Hua Bi, Bao Li and Li-Xin Wu
CrystEngComm 2011 vol. 13(Issue 5) pp:1360-1365
Publication Date(Web):09 Nov 2010
DOI:10.1039/C0CE00327A
A rare organic–inorganic hybrid compound based on the Dawson-like tungstobismuthate, [H2bipy][Cu(bipy)(H2O)2][Cu(bipy)3][H3BiW18O60]·H2O (bipy: 4,4′-bipyridine) (1a) has been hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, cyclic voltammetry (CV) and powder XRD. Single-crystal X-ray analysis reveals that in 1a each tungstobismuthate fragment [H3BiW18O60]6− (BiW18) acts as a tetradentate ligand connecting four cationic chains of four Cu-bipy complexes via the terminal oxygen atoms to form a three-dimensional (3D) structure with NbO-type topology. The electrochemical behaviours of 1a were investigated in 0.5 M Na2SO4 + H2SO4 (pH 2.5) solutions by CV. In the potential range between −0.65 and 0.4 V, the compound 1a exhibits the successive redox processes of W and Cu. The electrocatalytic experiments indicate that the compound 1a has good electrocatalytic activities towards the reduction of NO2− and H2O2.
Co-reporter:Ya-Yan Bao, Li-Hua Bi, Li-Xin Wu
Journal of Solid State Chemistry 2011 Volume 184(Issue 3) pp:546-556
Publication Date(Web):March 2011
DOI:10.1016/j.jssc.2011.01.011
Au nanoparticles (NPs) were synthesized in the one-pot procedure in water at room temperature with the wheel-shaped VV–VIV mixed-valence tungstovanadate [P8W48O184{V4VV2IVO12(H2O)2}2]32− (V12) acting as both reducing and stabilizing agents. The V12 stabilized Au NPs (Au@V12 NPs) were characterized by SEM, TEM, DLS, UV–vis spectroscopy, XPS, and XRD analyses and the negatively charged surface of the Au@V12 NPs was proved by the zeta potential analysis. Based on the layer-by-layer assembly (LbL), the Au@V12 NPs-containing multilayer films have been fabricated on ITO-coated glass slide and quartz substrates with poly(ethyleneimine) (PEI). The regular growth of the multilayer films was monitored by UV–vis spectroscopy and cyclic voltammetry, the composition was characterized by XPS. The Au@V12 NPs based composite films showed electrocatalytic activities towards the reduction of dioxygen and the oxidation of methanol. This approach is expected to open the way towards procedures aimed at the one-step fabrication of Au NPs and polyoxometalates (POMs) into the multilayer films.Graphical abstractThe wheel-shaped VV–VIV mixed-valence tungstovanadate [P8W48O184{V4VV2IVO12(H2O)2}2]32− (V12) stabilized Au nanoparticles (Au@V12 NPs) have been synthesized and characterized. The multilayer films containing Au@V12 NPs were fabricated and their electrocatalytic properties were studied.Research highlights► Au core-V12 shell nanostructures, Au@V12 NPs, were synthesized and characterized. ► The negatively charged Au NPs were fabricated and catalytic properties were studied. ► This study opens the way to the fabrication of multifunctional thin-film materials.
Co-reporter:Bin Wang, Zhen-Dong Yin, Li-Hua Bi and Li-Xin Wu
Chemical Communications 2010 vol. 46(Issue 38) pp:7163-7165
Publication Date(Web):09 Aug 2010
DOI:10.1039/C0CC01651A
We selected a Eu3+-containing tungstogermanate [(CH3)4N]2.5H7.5[Eu(GeW11O39)(H2O)2]2·4.5H2O (EuGeW) as a molecular dyad combining fluorescence and electroactivity components within the same framework and studied its electroswitchable fluorescence in solution and in the thin-film, which can be reversibly switched by electrochemical stimulation.
Co-reporter:Li-Hua Bi, Bin Wang, Guang-Feng Hou, Bao Li and Li-Xin Wu
CrystEngComm 2010 vol. 12(Issue 11) pp:3511-3514
Publication Date(Web):02 Aug 2010
DOI:10.1039/C0CE00087F
Reaction of Na2WO4 and NaVO3 with cis-Ru(dmso)4Cl2 in buffer solution (pH 6) led to the formation of a novel polyanion [HVW7O28Ru(dmso)3]6− (1), which is composed of an unprecedented heptatungstovanadate fragment stabilized by one Ru(dmso)3 group. The crystallization of 1 with sodium–potassium resulted in Na4K2[HVW7O28Ru(dmso)3]·Na3VO4·15H2O (1a), which exhibits a 3D architecture formed by the polyanion 1 and sodium–potassium linkers. and sodium–potassium linkers.
Co-reporter:Li-Hua Bi, Guang-Feng Hou, Bao Li, Li-Xin Wu and Ulrich Kortz
Dalton Transactions 2009 (Issue 32) pp:6345-6353
Publication Date(Web):01 Jul 2009
DOI:10.1039/B821750E
The reaction between [XW9O34]9− (X = As, P) and [RuC6H6Cl2]2 in aqueous buffer solution (pH 6.0) leads to the isolation of two pseudo-sandwich-type heteropolytungstates KNa6[(RuC6H6)AsW9O34]·17H2O (As-1) and Na7[(RuC6H6)PW9O34]·14H2O (P-2). Single-crystal X-ray diffraction analyses reveal that the two compounds have the following features: (1) in two polyanions [(RuC6H6)XW9O34]7− (X = As, 1; P, 2), the (RuC6H6) unit is linked via three Ru–O(W) bridges to the side of the trilacunary polyanion, while the lacunary site is still free; (2) the units 1 and 2 are connected exclusively by a central Na cation cluster to form the pseudo-sandwich-type heteropolytungstates; and (3) the pseudo-sandwich-type heteropolytungstates are further connected by Na or K cations to construct the 2D and 3D structures. Furthermore, the electrochemical behaviours of As-1 and P-2 in aqueous solution (1.0 M LiCl + HCl, pH 3.0) have been investigated. Two compounds exhibit the expected reduction processes of the W atoms in a negative potential range and the oxidation of the Ru center in a positive potential range. The results of the electrocatalytic experiments reveal that the compound P-2 has electrocatalytic activity towards the reduction of nitrate.
Co-reporter:Li-Hua Bi;Guang-Feng Hou;Ya-Yan Bao;Bao Li;Li-Xin Wu;Zhong-Min Gao;Timothy McCormac;Sib S. Mal;Michael H. Dickman;Ulrich Kortz
European Journal of Inorganic Chemistry 2009 Volume 2009( Issue 34) pp:5259-5266
Publication Date(Web):
DOI:10.1002/ejic.200900590
Abstract
Four new organic–inorganic hybrid compounds based on dmso-coordinated heteropolytungstates as [Ru(bpy)3]2+ (Rubpy) salts {[Ru(bpy)3]2Na2[Sb2W22(dmso)4O72]·4dmso·4H2O (1a), [Ru(bpy)3]2Na2[Bi2W22(dmso)4O72]·4dmso·4H2O (2a), [Ru(bpy)3]2[Sb2W20Fe2(dmso)8O68]·9dmso·12H2O (3a), [Ru(bpy)3]2[Bi2W20Fe2(dmso)8O68]·9dmso·12H2O (4a)} have been synthesized and characterized by IR spectroscopy, elemental analysis, thermogravimetry, cyclic voltammetry, X-ray powder diffraction and single-crystal X-ray diffraction. The structural analyses indicate that the dmso molecules are coordinated onto the polyanion frameworks through four W–O–S(CH3)2 bonds for 1a and 2a, six Fe–O–S(CH3)2 and two W–O–S(CH3)2 bonds for 3a and 4a. The compounds 1a–4a represent novel members of dmso-coordinated tungstoantimonates and tungstobismuthates prepared by routine synthetic reactions in the mixed solutions with dmso/H2O (1:1, v/v). The cyclic voltammetry studies of 1a–4a in dmso/H2SO4 medium using the glassy carbon electrode as a working electrode show the respective electrochemical behaviors of the W and Ru centers within 1a and 2a, and the W, Fe and Ru centers within 3a and 4a.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Co-reporter:Ya-Yan Bao, Li-Hua Bi, Li-Xin Wu, Sib Sankar Mal and Ulrich Kortz
Langmuir 2009 Volume 25(Issue 22) pp:13000-13006
Publication Date(Web):July 28, 2009
DOI:10.1021/la901854e
A novel surfactant-encapsulated organic−inorganic hybrid compound (DODA)24Li[Cu20Cl(OH)24(P8W48O184)]·18H2O (DODA-Cu20) has been prepared from the wheel-shaped tungstophosphate salt K12Li13[Cu20Cl(OH)24(H2O)12(P8W48O184)]·22H2O (Cu20) and dimethyldioctadecylammonium bromide (DODA), and it has been characterized by elemental analysis (EA), thermogravimetric analysis (TGA), 1H NMR, Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) measurements. Monolayer and multilayer films of DODA-Cu20 were fabricated on different substrates by the Langmuir−Blodgett (LB) technique using H2O as the subphase. Another type of organic−inorganic hybrid film, DODA/Cu20, was also deposited on the same substrates as used for the film containing DODA-Cu20 under the same conditions by the LB technique using a Cu20 aqueous solution as the subphase and DODA as the cationic amphiphile for comparison. Both thus-prepared organic−inorganic hybrid films were characterized by UV−vis spectroscopy, XRD, transmission and polarized FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The results indicate that stable monolayers at the air−water interface for DODA-Cu20 and at the air−Cu20 solution interface for DODA can be formed and that two LB films containing DODA-Cu20 and DODA/Cu20 constructed by two different methods both exhibit well-ordered lamellar structures. It is proposed that Cu20 exhibits different packing modes in the two LB films depending on the deposition strategy used.
Co-reporter:Lingxiao Xu, Bin Wang, Wenmei Gao, Lixin Wu and Lihua Bi
Journal of Materials Chemistry A 2015 - vol. 3(Issue 8) pp:NaN1737-1737
Publication Date(Web):2014/12/22
DOI:10.1039/C4TC02774D
For exploration of the effects of tungstophosphate structures on electrochemically induced fluorescence switchable behaviors, four composite films consisting of tris(1,10-phenanthroline) ruthenium (Ruphen) and tungstophosphates with different structures (PW: [PW12O40]3− (PW12), [P2W18O62]6− (P2W18), [NaP5W30O110]14− (P5W30), and [H7P8W48O184]33− (P8W48)) were prepared by the layer-by-layer self-assembly method under identical conditions. The composite films were characterized by cyclic voltammetry, UV-vis spectroscopy, X-ray photoelectron spectroscopy, fluorescence spectroscopy and atomic force microscopy. In situ fluorescence spectroelectrochemical measurements display that the fluorescence quenching efficiencies of the four composite films under electrochemical stimulation depend on the tungstophosphate structures, demonstrating that the desired electrochemically induced fluorescent switchable materials can be optimized by the choice of different polyoxometalates.
Co-reporter:Li-Hua Bi, Guang-Feng Hou, Bao Li, Li-Xin Wu and Ulrich Kortz
Dalton Transactions 2009(Issue 32) pp:NaN6353-6353
Publication Date(Web):2009/07/01
DOI:10.1039/B821750E
The reaction between [XW9O34]9− (X = As, P) and [RuC6H6Cl2]2 in aqueous buffer solution (pH 6.0) leads to the isolation of two pseudo-sandwich-type heteropolytungstates KNa6[(RuC6H6)AsW9O34]·17H2O (As-1) and Na7[(RuC6H6)PW9O34]·14H2O (P-2). Single-crystal X-ray diffraction analyses reveal that the two compounds have the following features: (1) in two polyanions [(RuC6H6)XW9O34]7− (X = As, 1; P, 2), the (RuC6H6) unit is linked via three Ru–O(W) bridges to the side of the trilacunary polyanion, while the lacunary site is still free; (2) the units 1 and 2 are connected exclusively by a central Na cation cluster to form the pseudo-sandwich-type heteropolytungstates; and (3) the pseudo-sandwich-type heteropolytungstates are further connected by Na or K cations to construct the 2D and 3D structures. Furthermore, the electrochemical behaviours of As-1 and P-2 in aqueous solution (1.0 M LiCl + HCl, pH 3.0) have been investigated. Two compounds exhibit the expected reduction processes of the W atoms in a negative potential range and the oxidation of the Ru center in a positive potential range. The results of the electrocatalytic experiments reveal that the compound P-2 has electrocatalytic activity towards the reduction of nitrate.
Co-reporter:Bin Wang, Zhen-Dong Yin, Li-Hua Bi and Li-Xin Wu
Chemical Communications 2010 - vol. 46(Issue 38) pp:NaN7165-7165
Publication Date(Web):2010/08/09
DOI:10.1039/C0CC01651A
We selected a Eu3+-containing tungstogermanate [(CH3)4N]2.5H7.5[Eu(GeW11O39)(H2O)2]2·4.5H2O (EuGeW) as a molecular dyad combining fluorescence and electroactivity components within the same framework and studied its electroswitchable fluorescence in solution and in the thin-film, which can be reversibly switched by electrochemical stimulation.
Co-reporter:Bin Wang, Rui-Qi Meng, Li-Hua Bi and Li-Xin Wu
Dalton Transactions 2011 - vol. 40(Issue 19) pp:NaN5301-5301
Publication Date(Web):2011/04/05
DOI:10.1039/C1DT10259A
In this paper, we attempt to construct a simple and sensitive detection method for hydrogen peroxide based on reversible colour change and luminescence switching modulated by the electrochemical stimulation and redox reaction of H2O2 with electroreduced polyoxometalate. This method successfully combines the electrochromic and luminescent properties of the polyoxometalate to develop a novel detection method for H2O2 with good reversibility, which displays high sensitivity, a wide linear range and a low detection limit to H2O2.
Co-reporter:Bin Wang, Yingyi Ma, Shan Wang, Liying Zhang, Jing Liang, Haolong Li, Lixin Wu and Lihua Bi
Journal of Materials Chemistry A 2014 - vol. 2(Issue 22) pp:NaN4427-4427
Publication Date(Web):2014/03/04
DOI:10.1039/C3TC32306D
In this study, three hybrid films {[(PEI/P5W30)m/(PEI/PSS/PEI/GO@F)]n(PEI/P5W30)m} (m = 1, 3, 5; n = 15, 17, 18) (P5W30: [P5W30O110]15−; GO: graphene oxide; F: fluorescein) with green fluorescence have been successfully fabricated through a suitable structural design and alternate assembly of selected components. The fluorescence of the hybrid films can be reversibly switched by the electrochromism of the P5W30 component upon electrochemical modulation while the hybrid films display structural stability against the electrochemical process.
Co-reporter:Bin Wang, Li-Hua Bi and Li-Xin Wu
Journal of Materials Chemistry A 2011 - vol. 21(Issue 1) pp:NaN71-71
Publication Date(Web):2010/11/08
DOI:10.1039/C0JM03140B
We have fabricated an organic/inorganic hybrid thin film based on a Dawson-type polyoxometalate P2W18O626− (P2W18) and a luminescent transition metal complex tris(2,2′-bipyridine)ruthenium [Ru(bpy)3]2+ (Rubpy) by using a layer-by-layer assembly technique, which functions as an electroswitchable fluorescent device operated by electrochemical stimulation.
Co-reporter:
Analytical Methods (2009-Present) 2013 - vol. 5(Issue 4) pp:NaN890-890
Publication Date(Web):2012/12/05
DOI:10.1039/C2AY26217G
In this paper, we describe a novel detection of nitrite, iodate and bromate in solutions through combining the electrochemistry and the redox reaction accompanying the color change and luminescence switching based on Eu3+-containing tungstogermanate [(CH3)4N]2.5H7.5[Eu(GeW11O39)(H2O)2]2·4.5H2O (Eu-POM) for the first time. Eu-POM was electroreduced to form the reduced Eu-POM accompanied by a color change from colorless to blue and luminescence quenching, while the discoloration and luminescence recovery were observed after the addition of nitrite, iodate and bromate because of the spontaneous redox reactions of nitrite, iodate and bromate with the reduced Eu-POM. Based on this observation, we investigated the changes of absorbances and luminescence intensities of the reduced Eu-POM with the concentrations of nitrite, iodate and bromate and obtained good linear ranges and lower detection limits for the three substances based on S/N = 3. This method successfully combines the electrochromic and luminescent properties of polyoxometalate to develop a novel detection of nitrite, iodate and bromate with good reversibility and high sensitivity as well as a wide linear range. Therefore, such as system shows great potential for the detection of nitrite, iodate and bromate.