Control of the photoreactivity of diarylethene derivatives by quaternarization of the pyridylethynyl group.

[摘要]：Photochromic behavior of diarylethene derivs. with (4-pyridyl)ethynyl group directly attached to the 6-p hexatriene moieties of the diarylethenes was investigated. Upon quaternization of the pyridine moieties, the photoreactivity was strongly suppressed. On the other hand, diarylethene derivs. with nonconjugated (4-pyridyl)ethyl group exhibited the photochromic reactivity, regardless of whether pyridyl rings are quaternized or not. In the case of the (4-pyridyl)ethynyl-substituted compds., the photochromic reactivity was suppressed by the addn. of trifluoroacetic acid and was restored by diethylamine.

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