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

The ultrafast cyclization dynamics of photochromic thiol-functionalized terphenylthiazole-based diarylethene molecules was investigated by femtosecond pump-probe spectroscopy. The third harmonic generation (266 nm) of femtosecond Ti:Sapphire laser (Mira-900F) was used as a pump radiation. The supercontinuum generation (450-700 nm) was used as a probe radiation. The time of cyclization reaction is close to 0.9 ps for diarylethene derivative without alkyl-thiol chain, and is near 1.4 ps for derivative with alkyl-thiol chain. These resuts proves that terphenylthiazole-based diarylethenes are the perspective optoelectronic elements with the ultrafast optical response.