PHOTOCHROMIC KINETICS OF ASYMMETRICAL DIARYLETHENES IN DIFFERENT SOLVENTS AND IN PMMA FILMS

Min Li, Shouzhi Pu (), Chunhong Zheng, Mingbiao Luo and Zhanggao Le
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Min Li: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China;
Shouzhi Pu: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China
Chunhong Zheng: Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China
Mingbiao Luo: College of Biology, Chemistry and Material Science, East China Institute of Technology, Fuzhou 344000, Jiangxi, China
Zhanggao Le: College of Biology, Chemistry and Material Science, East China Institute of Technology, Fuzhou 344000, Jiangxi, China

Surface Review and Letters (SRL), 2008, vol. 15, issue 01n02, 145-151

Abstract: Three new asymmetric photochromic diarylethenes bearing fluorine atoms at theortho-,meta-, orpara-position of one terminal phenyl group were synthesized, and their photochromism and kinetics of the photochromic cyclization/cycloreversion both in different solvents and in PMMA films were investigated. The results showed that the cyclization/cycloreversion process of these compounds were determined to be zeroth/first order reaction, and the reaction rates(k)were obtained from the slope of every line. The substituent position effect on the cycloreversion process of the three compounds was remarkable and the solvent polarity enhanced this effect. The values of reaction rates in PMMA films were quite different from those in solvents indicating that the kinetics processes of the three compounds taking place in PMMA films differs from the same processes occurring in common solvent.

Keywords: Photochromic; kinetics; substituent position effect (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011135

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