Hydrothermal Syntheses and Characterization of Two Multi-vanadium Capped Keggin Polyoxoniobates Derivatives

doi:10.7503/cjcu20130386

Abstract

Abstract:

Two organic-inorganic hybrid compounds constructed from polyoxoniobates and transition metal coordination complexes, [Cu(TETA)]₄[VNb₁₂(VO)₄O₄₀][OH]·10H₂O(1) and [Cu(TETA)]₄\5[VNb₁₂(VO)₆O₄₀][OH]₅·5H₂O(2)(TETA=triethylenetetramine), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analyses, IR spectra, X-ray photoelectron spectrum(XPS), powder X-ray diffraction(PXRD), thermogravimetric analysis(TGA) and elemental analyses. Compound 1 is a 3D tetra-capped vanadoniobates and compound 2 is a 3D hexa-capped vanadoniobates which are constructed from heteropolyoxometalates and [Cu(TETA)]²⁺ fragments. The result of bond valence sum calculations indicates that the vanadium centers of VO₄ tetrahedral in｛VNb₁₂｝Keggin unit in compounds 1 and 2 are in oxidation state +Ⅴ whereas the remaining vanadium centers are in oxidation state +Ⅳ. This is in line with the analysis of X-ray photoelectron spectrum.

Key words: Multi-vanadium capped polyoxoniobate, Three-dimension, Keggin derivative

CLC Number:

O614

TrendMD:

ZHANG Xin, LIU Shu-Xia, LI Shu-Jun, WANG Xue-Na, JIN Hai-Yan, CUI Jia-Li, LIU Yi-Wei, LIU Cheng-Zhan. Hydrothermal Syntheses and Characterization of Two Multi-vanadium Capped Keggin Polyoxoniobates Derivatives[J]. Chem. J. Chinese Universities, 2013, 34(9): 2046.

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