Thermally irreversible photochromic systems. Photoreaction of diarylethene derivatives with imidazo [1, 2-a] pyridine rings

Y Nakayama, K Hayashi, M Irie

Index: Nakayama, Yasuhide; Hayashi, Koichiro; Irie, Masahiro Bulletin of the Chemical Society of Japan, 1991 , vol. 64, # 1 p. 202 - 207

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Citation Number: 34

Abstract

A non-symmetrical diarylethene with imidazo [1, 2-a] pyridine ring on one end and thiophene ring on the other end, 1, 2-dicyano-1-(2-methylimidazo [1, 2-a] pyridin-3-y1)-2-(2, 4, 5-trimetyl-3-thieny1) ethene 2Z underwent a hexatriene-cyclohexadiene type reversible ring-closure reaction by photoirradiation, while an only Z–E isomerization was observed for a symmetrical diarylenthene with two imidazo [1, 2-a] pyridine rings, 1, 2-dicyano-1, 2-bis ( ...