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题目:  Controllable assembly of multicarboxylic acids functionalized heteropolyoxomolybdates and allochroic properties

作者:  Yanfen Liang, Suzhi Li, Donghui Yang, Pengtao Ma, Jingyang Niu* and JingpingWang*

期刊:  J. Mater. Chem. C

年卷页:  2015, 3, 4632-4639

摘要:  A series of inorganic-organic hybrid heteropolyoxomolybdates built from [TeMo₆O₂₁]₂∙polyoxoanions and multicarboxylic acids including (C₃N₂H₅)₄H₆[(TeMo₆O₂₁)₂{O₂C(CH₂)₂CO₂}₃]∙9.5H₂O (1), (C₃N₂H₅)₈H₂- [(TeMo₆O₂₁)₂{O₂C(CH₂)₆CO₂}₃]∙3.5H₂O (2) and (CN₃H₄)₁₆H₄[(TeMo₆O₂₁)₄{C₆H₃(COO)₃}₄]∙16H₂O (3) have been synthesized arising from the reactions of (NH₄)₆Mo₇O₂₄•4H₂O, Na₂TeO₃/TeO₂ and the corresponding multicarboxylic acids in an aqueous medium. X-ray single crystal diffraction, X-ray powder diffraction (XPRD), elemental analyses, inductively coupled plasma (ICP) spectra, IR spectra, UV spectra and thermogravimetric(TG) analyses have been implemented. Crystal structure analyses reveal that both compounds 1 and 2 are dimers, while 3 is a tetramer, however, they contain the same {TeMo_6} unit which consists of a six-membered MoO₆ octahedral ring capped by one {TeO₃} trigonal pyramid. Compounds 1-3 exhibit intriguing allochroic properties. They can change color from white to blue/green when heated. Upon the irradiation of a xenon lamp (full wave-band, P=300 W), their color can change from white to reddish brown.