Studies on White Powdery Tungstic Acid(→) Stability and Photochemistry of Decatungstic Acid in Aqueous Solution Containing Polyvinyl Alcohol

Abstract

Abstract: Decatungstic acid can be formed by the reaction of white powdery tungstic acid in aqueous solution containing polyvinyl alcohol. The stability and photochromism of decatungstic acid in homogeneous system have been studied through UV-Vis spectra, ESR, pHtitration and W(Ⅴ) determination. The results show that the reduction degree of decatungstate anion corresponds to the acidity of the solution. One-electron reduced form is produced mainly at high pHvalue while two-electron reduced form mainly at low pHvalue.

Key words: White powdery tungstic acid (WPTA), Polyvinyl alcohol, Decatungstic acid, Stability, Photochromism

CLC Number:

O644.14

TrendMD:

YUE Bin, TANG Li-Hao, ZHU Si-San, LIN Xin-Rong . Studies on White Powdery Tungstic Acid(→) Stability and Photochemistry of Decatungstic Acid in Aqueous Solution Containing Polyvinyl Alcohol[J]. Chem. J. Chinese Universities, 1998, 19(9): 1453.

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Studies on White Powdery Tungstic Acid(→) Stability and Photochemistry of Decatungstic Acid in Aqueous Solution Containing Polyvinyl Alcohol

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