Abstract
Diarylethenes having a benzofuryl group and their thiophene-S,S-dioxidized diarylethenes were synthesized and their optical properties and thermal stability were investigated. Upon oxidation of the thiophene ring, the optical properties such as absorption maxima, photocycloreversion quantum yields, and conversion from the open-ring isomer to the closed-ring isomer have changed. On the other hand, the thermal stability of the closed-ring isomers of the S,S-dioxidized diarylethenes is significantly higher than those of thiophene-S,S-dioxidized diarylethenes having a phenylthienyl group instead of a benzofuryl group. The high thermal stability of the closed-ring isomer was quantitatively discussed based on ground state energies obtained by quantum chemical calculations.
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