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Zhao S.,Key Laboratory of Polyoxometalate Science | Wang X.,Key Laboratory of Polyoxometalate Science | Huo M.,Northeast Normal University
Applied Catalysis B: Environmental | Year: 2010

Micellar molybdovanadophosphoric polyoxometalate (POM) catalysts [(CnH2n+1)N(CH3)3]3+xPVxMo12-xO40 (x = 1, 2, 3; n = 8, 12, 14, 16, 18) were prepared and used for catalytic wet air oxidation (CWAO) of phenol. X-ray photoelectron spectrum (XPS), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) were used to characterize the resulting samples. The best catalytic activity was obtained over (C16TA)6PV3Mo9O40, which showed 95.3% degradation efficiency, 98.5% COD removal and 93.0% TOC reduction with air under room condition toward complete degradation product CO2 within 90 min. The leaching test showed that the POM micellar catalysts have an excellent stability and can be used as heterogeneous catalysts for about six times. © 2010 Elsevier B.V. All rights reserved. Source


Zhang L.-C.,Key Laboratory of Polyoxometalate Science | Zhang L.-C.,Liaoning Normal University | Xue H.,Liaoning Normal University | Zhu Z.-M.,Liaoning Normal University | And 4 more authors.
Inorganic Chemistry Communications | Year: 2010

Two new polyoxometalate-based estertin derivatives, Na6K4[{Sn(C3H4O2)}2{Sn(C3H4O2)(H2O)}2·(B-β-SbW9O33)2]·14H2O (1) and Na4K6[{Sn(C4H6O2)(H2O)}2(WO2)2(B-β-SbW9O33)2]·19H2O (2), have been synthesized by the reaction of Na9[B-α-SbW9O33]{bullet operator}19.5H2O with Cl3Sn(CH2)2COOCH3 or Cl3SnCH2CH(CH3)COOCH3 in an aqueous KCl solution. Both compounds exhibit the sandwich-type structural feature, in which the carboxyethyltin fragments are sandwiched by two B-β-[SbW9O33]9- units. Structural analyses reveal that the reaction process involves α → β isomerization of [SbW9O33]9- unit and the hydrolysis of estertin into carboxyethyltin group. Both compounds display good electrocatalytic activities toward the reduction of hydrogen peroxide, and compound 1 also shows good anti-tumoral activities in vitro. © 2010 Elsevier B.V. All rights reserved. Source


Wang S.-M.,Key Laboratory of Polyoxometalate Science | Li Y.-W.,Key Laboratory of Polyoxometalate Science | Feng X.-J.,Key Laboratory of Polyoxometalate Science | Li Y.-G.,Key Laboratory of Polyoxometalate Science | Wang E.-B.,Key Laboratory of Polyoxometalate Science
Inorganica Chimica Acta | Year: 2010

The deep eutectic solvents synthetic method was initially explored as a facile synthesis route to prepare new polyoxometalate (POM)-based hybrids. Such a method can not only avoid poor solubility, lower yields and the potential explosion, but also act as a new type of noxious, convenient and environmental friendly organic reagents. Using the choline chloride/urea eutectic mixture as the deep eutectic solvents, two new compounds, [(CH3)3N(CH2)2OH]4[β-Mo8O26] (1) and {(N2H5CO)[(CH3)3N(CH2)2OH]2}[CrMo6O24H6]·4H2O (2), were successfully obtained at room temperature. Both compounds were fully characterized by elemental analyses, IR, UV-Vis, TG analyses, cyclic voltammetry and single-crystal X-ray diffraction. The crystal structures of both compounds exhibit 3-D supramolecular assembly based on the extensive hydrogen bonding interactions between organic cations and polyoxoanions. Compounds 1 and 2 represent the first POM-based hybrids prepared by the deep eutectic solvents synthetic method. © 2009 Elsevier B.V. All rights reserved. Source


Wu Q.,Key Laboratory of Polyoxometalate Science | Li Y.-G.,Key Laboratory of Polyoxometalate Science | Wang Y.-H.,Key Laboratory of Polyoxometalate Science | Zhang Z.-M.,Key Laboratory of Polyoxometalate Science | Wang E.-B.,Key Laboratory of Polyoxometalate Science
Inorganic Chemistry Communications | Year: 2010

A new sandwich-type polyoxometalate (POM) K12Na1[(HPW7O28)2Mn]·17.5H2O (1) has been synthesized and characterized by elemental analysis, IR, TG, UV as well as single-crystal X-ray diffraction analysis. Compound 1 represents the first sandwich-type POM constructed by the penta-lacunary heptatungstophosphate [HPW7O28]8- moieties. Moreover, compound 1 exhibits good electrocatalytic properties to reduce the nitrite. © 2009 Elsevier B.V. All rights reserved. Source


Liu L.,Key Laboratory of Polyoxometalate Science | Li F.,Key Laboratory of Polyoxometalate Science | Xu L.,Key Laboratory of Polyoxometalate Science | Liu X.,Key Laboratory of Polyoxometalate Science | Gao G.,Key Laboratory of Polyoxometalate Science
Journal of Solid State Chemistry | Year: 2010

Two new polyoxometalate compounds [(CH3)4N]8[Ln(H2O)8]2[(α2-As2W17O61)Ln(H2O)2]2·nH2O (Ln=Er (1), Dy (2)) have been prepared by the trivacant Dawson-type anion [α-As2W15O56]12- and trivalent rare earth ion and characterized by single-crystal X-ray diffraction, IR spectra, thermogravimetric and electrochemical analyses. The centrosymmetric polyoxoanion, {[(α2-As2W17O61)Ln(H2O)2]2}14-, bounded to each other via Ln3+ connecting to terminal W-O oxygen atoms. Furthermore, the polyoxoanions are linked by [Ln(H2O)8]3+ to form an extensive 3D supramolecular network structure depending on hydrogen bond. The magnetic properties of the two compounds have been studied by measuring their magnetic susceptibilities in the temperature range 2.0-300.0 K, indicating the depopulation of the stark components at low temperature and/or very weak antiferromagnetic interactions between magnetic centers. Low-temperature ac magnetic susceptibility measurements reveal a slow magnetic relaxation behavior for 2. © 2009 Elsevier Inc. All rights reserved. Source

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