Thermally irreversible photochromic systems. Photoreaction of diarylethene derivatives with imidazo(1,2-a)pyridine rings.
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概要
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A non-symmetrical diarylethene with imidazo[1,2-<I>a</I>]pyridine ring on one end and thiophene ring on the other end, 1,2-dicyano-1-(2-methylimidazo[1,2-<I>a</I>]pyridin-3-y1)-2-(2,4,5-trimetyl-3-thieny1)ethene <B>2<I>Z</I></B> underwent a hexatriene-cyclohexadiene type reversible ring-closure reaction by photoirradiation, while an only <I>Z</I>–<I>E</I> isomerization was observed for a symmetrical diarylenthene with two imidazo[1,2-a]pyridine rings, 1,2-dicyano-1,2-bis(2-methylimidazo[1,2-a]pyridin-3-yl)ethene <B>1<I>Z</I></B>. The ring-closure reaction was not discerned. The photogenerated closed-ring form <B>2C</B> had the absorption band at 535 nm, which is 23 nm longer wavelengths than that of the corresponding dithienylethene, and kept the absorption intensity constant for more than 24 h at 80 °C. The quantum yield close to unity was observed for the photochemical ring-opening reaction of <B>2C</B> with 546 nm light.
- 公益社団法人 日本化学会の論文
著者
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Irie Masahiro
Institute For Occupational Health Science Aichi Medical University
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Nakayama Yasuhide
The Institute of Scientific and Industrial Research, Osaka University
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Hayashi Koichiro
The Institute of Scientific and Industrial Research, Osaka University
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