采用sol-gel技术, 利用缺位杂多酸中氧原子不饱和性, 将Keggin结构缺位杂多酸盐SiW11以共 价键结合到SiO2 网络上, 制备了SiW11/SiO2/PVA复合薄膜. IR光谱表明, SiW11在基体中基本保持Keggin结构, 与SiO2网络上形成了W--O--Si 共价键. 由于W--O--Si键的生成, 造成Keggin结构SiW11产生一定的形变. 此薄膜在紫外光照射下变蓝, 具有较好的光致变色性质.
A novel SiW11/SiO2/PVA hybrid film was fabricated by using a sol-gel method. Mono-vacant Keggin-type polyoxometalates [Xn+ W11O39] (12-n)- (SiW11) were introduced into SiO2 network. The IR spectrum indicates that the covalent bond of W--O--Si is formed between SiW11 and SiO2 network, and SiW11 anions still maintain Keggin structure basically in the hybrid film. However, the strong reaction between SiW11 and matrix brings big shape changes on SiW11 anions. The transparent film changes from colorless to dark blue under UV irradiation and shows a good photochromic havior.
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