Multiphoton-gated cycloreversion reaction of a photochromic 1,2-bis(thiazolyl) perfluorocyclopentene diarylethene derivative

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• 作者：Jonathan Piard^a ; Yukihide Ishibashi^b ; ¹ ; Hisayuki Saito^b ; Ré ; mi Mé ; tivier^a ; Keitaro Nakatani^a ; ^{nakatani@ppsm.ens-cachan.fr} ; Gildas Gavrel^c ; Pei Yu^c ; Hiroshi Miyasaka^b ; ^{miyasaka@chem.es.osaka-u.ac.jp}
• 关键词：Photochromism ; Diarylethene ; Two-photon absorption ; Multiphoton process ; Transient absorption spectroscopy
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2012
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：15 April, 2012
• 卷：234
• 期：Complete
• 页码：57-65
• 文件大小：1413 K

摘要

Cycloreversion processes of a 1,2-bis(thiazolyl) perfluorocyclopentene photochromic diarylethene 1 with extremely low reaction yield under steady state irradiation in chloroform solution (1.3 脳 10^鈭?) was investigated by means of picosecond and femtosecond laser photolysis methods. The cycloreversion reaction was drastically enhanced by more than two orders of magnitude (ca. 脳400) by a picosecond 532 nm laser excitation in comparison with a steady state irradiation. From time-resolved transient absorption measurements, double pulse experiments, and excitation intensity dependence of the transient absorbance and the reaction efficiency, this enhancement was attributed to a stepwise two-photon absorption process leading to high excited state.