Synthesis new photochromic diarylethenes 1-(2,5-dimethylthiazole)-2-4-(2-cyanophenyl)-3-thienyl} perfluorocyclopentene

摘要

A unsymmetrical photochromic diarylethene, 1-(2,5-dimethylthiazole)-2-[4-(2-cyanophenyl)-3-thienyl]} perfluorocyclopentene(1a),was synthesized, and itsoptoelectronic properties were also investigated in detail. The results showed that this compoundexhibited reversible photochromism, changing from colorless to orange red after irradiation with UVlight both in solution and in PMMA amorphous film.The open-ring isomer of the diarylethene 1exhibited relatively strong fluorescence at 432 nm when excited at 384 nm. The fluorescenceintensity declined along with the photochromism upon irradiation with 297 nm light.The diaryletheneexhibited a fluorescence switches along with the photochromism from open-ring isomers toclosed-ring isomers. When irradiated by UV light, the photocyclization reaction was occurred and theemission intensity of the diarylethene decreased significantly, due to producing the non-fluorescenceclosed-ring isomers. The back irradiation by appropriate wavelength visible light regenerated itsopen-ring isomers and recovered the original emission intensity.