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Novel Hybrid Inorganic–organic Film Based on the Tungstophosphate Acid–polyacrylamide System: Photochromic Behavior and Mechanism

Published online by Cambridge University Press:  31 January 2011

Wei Feng ,
Tie Rui Zhang ,
Yan Liu ,
Li Wei ,
Ran Lu ,
Tie Jin Li ,
Ying Ying Zha  and
Jian Nian Yao
Wei Feng
Affiliation:
Department of Chemistry, Jilin University, ChangChun 130023, People's Republic of China
Tie Rui Zhang
Affiliation:
Department of Chemistry, Jilin University, ChangChun 130023, People's Republic of China
Yan Liu
Affiliation:
Department of Chemistry, Jilin University, ChangChun 130023, People's Republic of China
Li Wei
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
Tie Jin Li
Affiliation:
Department of Chemistry, Jilin University, ChangChun 130023, People's Republic of China
Ying Ying Zha*
Affiliation:
Department of Chemistry, Jilin University, ChangChun 130023, People's Republic of China
Jian Nian Yao
Affiliation:
Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences,Beijing 100080, People's Republic of China
*
a)Address all correspondence to this author. e-mail: cgrimes@engr.psu.edu
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Abstract

A novel photochromic complex composed of Keggin-type tungstophosphate acid (PW12) and polyacrylamide (PAM) was prepared. Atomic force microscopy (AFM), thermogravimetric study, Fourier transform infrared spectra (FTIR), ultraviolet–visiblea bsorption spectra (UV-VIS), and electron resonance spectra (ESR) were used to investigate the surface topography, composition, and photochromic behavior and mechanism of the film. Under UV irradiation, the film was reduced photochemically to yield a blue species. AFM images indicated that surface topography of the polymer matrix changed after adding PW12. FTIR results showed that the Keggin geometry of PW12 was still preserved inside the matrix, and a charge-transfer bridge was built between PW12 and PAM by hydrogen bonding. The characteristic signal of W (V) and the formation of a radical signal in ESR spectra indicated that PAM was a hydrogen donor and the photoreduced process was in accordance with the radical mechanism.The diffusion of oxygen in the polymeric network plays an important role in the reversibility of photochromism.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 1 , January 2002 , pp. 133 - 136
Copyright
Copyright © Materials Research Society 2002

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