首页> 外文期刊>Chemistry: A European journal >Polymorphism of 1,2-Bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluro-cyclopentene and Photochromic Reactivity of the Single Crystals
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Polymorphism of 1,2-Bis(2-methyl-5-p-methoxyphenyl-3-thienyl)perfluro-cyclopentene and Photochromic Reactivity of the Single Crystals

机译:1,2-双(2-甲基-5-对甲氧基苯基-3-噻吩基)全环戊烯的多态性与单晶的光致变色反应性

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摘要

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 alternative irradiation with ultraviolet (lambda = 370 nm) and visible light (lambda > 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.
机译:通过从己烷中重结晶1,2-双(2-甲基-5-对甲氧基苯基-3-噻吩基)全氟环戊烯(1a)获得四个多晶型晶体。在交替照射紫外线(λ= 370 nm)和可见光(λ> 500 nm)后,所有晶体均发生光致变色反应。不论晶体类型如何,发现光环化量子产率都接近于1,而根据晶体中闭环异构体的构象,光环还原量子产率相差多达四倍。

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