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Synthesis, Crystal Structure and Properties Research of Polyoxometalate Containing Tungsten

Author: GaoZuo
Tutor: ZhouBaiBin
School: Harbin Normal University
Course: Inorganic Chemistry
Keywords: Polyoxometalates Aqueous solution method W6O18 unit W12O42 unit W18O56 unit Electrochemical properties
CLC: O611.4
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


Nine new polyoxometalate compounds, which are decorated or bridged by various transition complexes, are synthesized by aqueous solution method on the basis of W12O42, W18O56 polyoxoanion clusters. The chemical formulas of nine compounds can be made by elemental analyses and TG analysis:[Na2M(OH)6W6O18] (imi)2·2H3O (M=Fe(1), Cu(2),Ni(3))[{Cu(bim)(H2O)2｝4(H4W12O42)]·14H2O(4)(Himi)6[{Mn(imi)(H2O)}(H4W12O42)]·2H2O(5)[{Cu0.5(H2O)}2{Cu0.5(H2O)2}2{Cu(bim)(H2O)2}2(H4W12O42)]·10H2O(6)[{Na(H20)4}2{Cu0.5(H2O)}4{Cu0.5 (H2O)1.5}2(H4W12O42)]·3H2O (7)[｛Na(H2O)4.5｝2(H5W12O42)][｛Na5(H2O)16｝｛Cu(H2O)2｝4(H4W12042)]·13H2O(8)(Himi)6[H3W18O56Na(OH)6]·4H2O(9)The structure of compounds are characterized by IR, TG and single crystal X-ray diffractions. The result shows that compounds 1-3 are isostructural. Furthermore, each [MW6(OH)6O18]4-(M=Fe2+, Cu2+, Ni2+) anion links six Na+ cations via terminal atoms of the polyoxoanion and each Na+ cation also links three polyoxoanions to form 3D structure. The imidazoles dissociate in the cavity between the polyoxoanions and Na+ cations. Compounds 4 is formed into isolated structure,{Cu(bim)(H2O)2}2+ fragments modifying [H4W12042]8- polyoxoanion. The compound 5 is an infinite 1D "wave-like" chain linked by [H4W12O42]8- polyanion and [Mn(imi)(H2O)]2+. Compound 6 is 2D layer structure formed by the interaction of 1D [{Cu0.5(H2O)}2(H4W12042)]6- and [{Cu0.5(H2O)2}2(H4W12O42)]6- chains. While compound 7 is 3D network, abbreviated to (6,2)-connected. Compound 8 is a 3D framework which is formed by 2D layer formed by two 1D chains of [{Cu(H2O)}2(H4W12O42)]n6- and [Na5(H2O)]6]n5+ chains. Compound 9 is isolated structure of Dawson-like.In addition, the electrochemical properties of these compounds are researched.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Inorganic synthetic chemistry
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