Substituent Effect on the Photochromic Reactivity of Bis(2-thienyl)- perfluorocyclopentenes and a Gated Photochromic System

摘要

Substituent effect on the photochromic reactivity of bis(2-thienyl)perfluorocyclopentenes was examined. Introduction of phenyl groups having electron-donating substituents on the para-position of the phenyl ring to the 5-position of the thiophene rings shifted the absorption bands of the open-ring isomers to longer wavelengths and reduced the quantum yield of the cyclization reactions. The substitution with p-(N, N-diethylamino)phenyl groups prohibited the cyclization reaction.