Syntheses and Properties of Adducts Between Heteropoly Tungstic and Molybdic Acids and Their Salts with Dimethyl Sulfoxide

Abstract

Abstract: Nine dimethyl sulfoxide (DMSO) adducts of heteropoly tungstic and molybdic acids and their salts were synthesized in mixed solvent of acetonitrile and water. Their properties were characterized by IR, Raman, UV-Vis,¹Hand ¹³C NMRspectra, TG-DTAthermal analysis, and X-ray diffraction analysis. The results show that the coordinating atom of DMSOis the oxygen atom of S = Obond . In the adducts, the a-Keggin structure of heteropoly anions keeps well. The organic lig-ands do not coordinate directly with heteropoly anions, but with protons in heteropoly acids by hydrogen-bond, forming oxonium ions, or with metal cations in heteropoly acid salts by coordination bond, forming complex ions. The adducts lost their organic ligands in a few steps in the range of 100-450 ℃, and the a-Keggin structure of heteropoly anions decomposes as temperature is higher than 500 ℃-The crystallographic data of CaPW-DMSOand (Bu₃NH)₃PW-DMSOsingle crystals were also determined.

Key words: Heteropoly tungstate and molybdate, Dimethyl sulfoxide, Adduct

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Gu Yidong, Ding Jianping . Syntheses and Properties of Adducts Between Heteropoly Tungstic and Molybdic Acids and Their Salts with Dimethyl Sulfoxide[J]. Chem. J. Chinese Universities, 1990, 11(2): 115.

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Syntheses and Properties of Adducts Between Heteropoly Tungstic and Molybdic Acids and Their Salts with Dimethyl Sulfoxide

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