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Polymorphism of 1,2-Bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluorocyclopentene and Photochromic Reactivity of the Single Crystals

✍ Scribed by Masakazu Morimoto; Seiya Kobatake; Masahiro Irie

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 202 KB
Volume: 9
Category: Article
ISSN: 0947-6539
DOI: 10.1002/chem.200390066

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✦ Synopsis

Abstract

Four polymorphic crystals were obtained by recrystallization of 1,2‐bis(2‐methyl‐5‐p‐methoxyphenyl‐3‐thienyl)perfluorocyclopentene (1 a) from hexane. All crystals underwent photochromic reactions upon alternate irradiation with ultraviolet (λ=370 nm) and visible light (λ>500 nm). The photocyclization quantum yields were found to be close to unity irrespective of the crystal types, while the photocycloreversion quantum yields were different as much as four times depending on the conformation of the closed‐ring isomers in the crystals.

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