Keggin结构钨磷酸/聚乙烯吡咯烷酮复合膜的制备和光致变色性质研究

近年来，由于无机－有机复合材料具有潜在的应用前景和特殊性能，尤其是光致变色性能，引起研究者们的广泛兴趣^1-3]，以杂多化合物为多核配合物，通过化合键或氢键作用与高分子底物结合，形成电荷转移物质，可以大大提高复合材料的化学和物理性能。目前，这一领域的研究在国外已经成为热点^4-7]。本文以Keggin结构钨磷酸和聚乙烯吡咯烷酮为原料，报道了该类复合物的合成、表征及光致变色性质。

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

A new 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 N atoms 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 ESR spectra 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 UV light and the result in the oxidation of the cation and the reduction of the anion.