Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 9, Issue 3, Pages 621-627Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200390066
Keywords
diarylethene; photochromism; polymorphism; quantum yield; single crystal
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Four polymorphic crystals were obtained by recrystallization of 1,2-bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluorocyclopentene (1a) from hexane. All crystals underwent photochromic reactions upon alternate irradiation with ultraviolet (lambda = 370 nm) and visible light (lambda > 500 nm). The hotocyclization 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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