A New Photochromic Diarylethene for Reversible Molecule Switching Properties Based on Pyrrole and Thiophene
A new unsymmetrical photochromic diarylethene bearing a pyrrole and a thiophene aryl unit 1-(5-cyan-1,2-dimethylpyrrole)-2-(5-aldehyde-2-butylthiophene) perfluorocyclopentene(1a) has been synthesized. Its properties, including photochromism and kinetics were investigated in detail. It underwent reversible cyclization and cycloreversion reactions upon alternating with UV and visible light both in solution and in PMMA film. The results showed that this compound exhibited reversible photochromism, changing from colorless to blue upon irradiation with UV light, in which absorption maximum were observed at 649 nm and 583 nm in solution and PMMA amorphous film, respectively. This new photochromic system also exhibited remarkable reaction kinetics in hexane solution.
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
S. H. He et al., "A New Photochromic Diarylethene for Reversible Molecule Switching Properties Based on Pyrrole and Thiophene", Advanced Materials Research, Vols. 284-286, pp. 2239-2242, 2011