Femtosecond Transient Absorption Spectroscopy of Photochromic Thiol-Functionalized Terphenylthiazole-Based Diarylethene Molecules

Cyclization reaction dynamics of photochromic thiol-functionalized terphenylthiazole-based diarylethene molecules was investigated by means of femtosecond pump-probe spectroscopy. Third harmonic generation (266 nm) of femtosecond Ti:Sapphire laser (Mira-900F) was used as a pump radiation. As a probe radiation we used supercontinuum generation (450–700 nm). The time constant of cyclization reaction for photochromic thiol-functionalized terphenylthiazole-based diarylethene molecules with alkyl chain is close to 1. 4 ± 0. 1 ps, and the one without alkyl chain is close to 0. 9 ± 0. 1 ps.