A novel structure and photochromism of heteropolyoxometalates dispersed in polymer networks

被引：8

作者：

Bao, Xin-Jian ^{[1
,2
]}

Feng, Wei ^{[1
]}

Chen, Jie ^{[1
]}

Liu, Xiao-Yang ^{[2
]}

机构：

[1] Dalian Maritime Univ, Optoelect Technol Inst, Dalian 116026, Peoples R China

[2] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130023, Peoples R China

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2012年 / 191卷

关键词：

Polyoxometalates; Poly(acrylamide-co-vinylamine); Photochromism; Heteropolygreen; FILMS; POLYACRYLAMIDE; SPECTROSCOPY; BEHAVIOR; ACID;

D O I：

10.1016/j.jssc.2012.03.007

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Nanocomposites based on Keggin structure tungstophosphate acid (PWA) with 'branch-like' nanometer well dispersed in poly(acrylamide-co-vinylamine) (PAM-co-PVAm) were fabricated. The microstructure and photochromic properties were studied via Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM), ultraviolet-visible spectra (UV-vis) and electron resonance spectra (ESR). FT-IR results showed that the Keggin geometry of polyoxometalates was still preserved inside the composites and hydrogen bonding and salt formation were built between PWA and polymer matrix. SEM and TEM images showed that PWA nanoparticles were finely dispersed in polymer matrix with 'branch-like' shape. Under UV irradiation, the film was reduced photochemically to yield a glaucous species. After UV light turned off, the color of film became green. Two photo-reduction processes (one was between acylamino and heteropoly acid, another was between amidocyanogen and heteropoly acid) occurred at the same time in PWA/PAM-co-PVAm system, which resulted in the formation of heteropolygreen. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：158 / 161

页数：4

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