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Fabrication of heteropolyoxometalate-based photochromic inorganic–organic nanocomposites

Published online by Cambridge University Press:  31 January 2011

Tie Rui Zhang ,
Wei Feng ,
Chun Yan Bao ,
Ran Lu ,
Xin Tong Zhang ,
Tie Ji Li ,
Ying Ying Zhao  and
Jian Nian Yao
Tie Rui Zhang
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Wei Feng
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Chun Yan Bao
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Ran Lu
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Xin Tong Zhang
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Tie Ji Li
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Ying Ying Zhao*
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Jian Nian Yao
Affiliation:
Institute of Chemistry and Center for Molecular Science, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
*
a)Address all correspondence to this author.zhyy@mail.jlu.edu.cn
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Abstract

A series of photochromic sol-gel films are prepared through entrapping tungsten heteropolyoxometallates (PW12O403−, SiW12O404−) and molybdenum heteropolyoxometallate (PMo12O403−) into a kind of inorganic–organic matrix cohydrolyzed from tetraethylorthosilicate and 3-aminopropyltriethoxysilane. The films show reversible photochromicity. Irradiated with ultraviolet light, the transparent films change from colorless to blue. Then, bleaching occurs when the films are in contact with air or O2 in the dark. The Keggin-type polyanions interact with R–NH3+ cations strongly, and thus disperse uniformly in the sol-gel matrix, as proved by Fourier transform infrared spectra and x-ray diffraction. The molybdenum heteropolyoxometallate sol-gel film has higher photochromic efficiency and much slower bleaching than its counterparts of tungsten heteropolyoxometallate. A charge-transfer model which is supported by electron spin resonance and related literature [T. Yamase, Chem. Rev. 98, 307, (1998)] is put forth to explain the above experimental results.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2256 - 2263
Copyright
Copyright © Materials Research Society 2001

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