Photochromism of 1, 2-bis (2-ethyl-5-phenyl-3-thienyl) perfluorocyclopentene in a single-crystalline phase. Conrotatory thermal cycloreversion of the closed-ring …

S Kobatake, K Shibata, K Uchida…

Index: Kobatake; Shibata; Uchida; Irie Journal of the American Chemical Society, 2000 , vol. 122, # 49 p. 12135 - 12141

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Citation Number: 89

Abstract

1, 2-Bis (2-ethyl-5-phenyl-3-thienyl) perfluorocyclopentene (1a) was found to undergo a thermally reversible photochromic reaction in solution as well as in the single-crystalline phase. Upon irradiation with ultraviolet light the hexane or toluene solution containing 1a and single-crystal 1a turned blue along with the formation of closed-ring isomer (1b). The blue solution and single crystal returned colorless by irradiation with visible light (λ> 500 ...