Preparation and Photochromic Properties of Keggin Type Tungstophosphate Acids Based on Polyvinyl Pyrrolidone

Abstract

Abstract: Anew photochromic complex of Keggin type tungstophosphate acid/polyvinyl pyrrolidone system was prepared, and its thin films was made by the dipping method. Their photochromic properties were investigated by FTIR, UV-Vis spectra. The salts were formed by the combination of the ion based on the Natoms in the polymeric molecules and H⁺ of the acids. The UV-Vis spectra showed that this type of system had an excellent photochromic behavior. The g values of ESRspectra for the one electron blues were the characteristic of tetragonal W(Ⅴ) complex in colored thin film. It was indicated that the charge could be transferred between the anion and cation under irradiation of UVlight and the result in the oxidation of the cation and the reduction of the anion.

Key words: 12-Tungstophosphate, Polyvinyl pyrrolidone, Photochromism, Charge transfer

CLC Number:

O635

TrendMD:

FENG Wei, ZHANG Tie-Rui, LIU Yan, LU Ran, ZHAO Ying-Ying, Yao-Jian-Nian . Preparation and Photochromic Properties of Keggin Type Tungstophosphate Acids Based on Polyvinyl Pyrrolidone[J]. Chem. J. Chinese Universities, 2001, 22(5): 830.

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Preparation and Photochromic Properties of Keggin Type Tungstophosphate Acids Based on Polyvinyl Pyrrolidone

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