Photochromism of Ionic Liquid-like Polyoxometalates Functionalized by Sulfonic Acid

doi:10.11944/j.issn.1000-0518.2015.07.140419

Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (7): 808-815.DOI: 10.11944/j.issn.1000-0518.2015.07.140419

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Photochromism of Ionic Liquid-like Polyoxometalates Functionalized by Sulfonic Acid

LI Yuanyuan, YANG Chun^*

Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biofunctional Materials,College of Chemistry and Material Science,Nanjing Normal University,Nanjing 210097,China

Received:2014-12-09 Accepted:2015-03-25 Published:2015-06-30 Online:2015-06-30
Contact: Chun YANG
Supported by:
Supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions

Abstract

Abstract:

It was found that ionic liquid-like polyoxometalates(IL-POM) functionalized by sulfonic acid possess reversible photochromic properties. Detailed photochromism of [PyPS]_nH_3-_nPW₁₂(n=1,3), [PyPS]₄SiW₁₂ and [TEAPS]₃PW₁₂ samples were investigated. IL-POMs functionalized by sulfonic acid are a class of salts with weak charge-transfer effect. Under UV irradiation, however, electron interaction between organic cations and POM anions results in the reduction of W⁶⁺ to W⁵⁺. The formation of a stable charge-transfer complex leads to the coloration. The photochromic ability of tungstophosphate is stronger than that of tungstosilicate. The decoloration occurred in air when the colored sample was placed in dark. But the sample is easily fatigued and a coloration-decoloration cycle with poor reproducibility is observed. A study on photochromic mechanism shows that -SO₃H group in organic cation is involved in photochromic process as an electron donor. This reveals the donor property of sulfonic acid and provides a new strategy for designing charge-transfer polyoxometalates and POM-based photochromic materials.

Key words: polyoxometalates, ionic liquid, functionalized by sulfonic acid, photochromism, mechanism

CLC Number:

LI Yuanyuan, YANG Chun. Photochromism of Ionic Liquid-like Polyoxometalates Functionalized by Sulfonic Acid[J]. Chinese Journal of Applied Chemistry, 2015, 32(7): 808-815.

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Photochromism of Ionic Liquid-like Polyoxometalates Functionalized by Sulfonic Acid

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