Photochromic dynamics of diarylethene compounds in solution and in PMMA amorphous film

摘要

Two novel photochromic diarylethenes, 1,2-bis-[2-methyl-5-(4-formylphenyl)-3-thienyl]perfluorocyclopentene (1a) and 1,2-bis[2-methyl-5-(p-fluorophenyl)-3-thienyl]perfluorocyclopentene (2a), were synthesized and their photochromism and dynamics of the ring opening and closure reaction both in solution and in PMMA film were investigated. The results showed that 1a and 2a changed the color from colorless to blue upon irradiation with 313 nm UV light, in which absorption maxima were observed at 600 and 572 nm in hexane and at 612 and 588 nm in PMMA film, respectively. Their cyclization/cycloreversion processes were zeroth and first order reaction both in solution and in PMMA film, respectively.