title: The photochromism and fluorescence of diarylethenes with a imidazole bridge unit: a strategy for the design of turn-on fluorescent diarylethene system.
abstract: A class of diarylethenes with a imidazole bridge unit has been synthesized and shows photochromic properties with UV/vis light irradiation. It is found that electronic properties of substituent in the imidazole bridge unit have a great effect on both photochromism and fluorescence of diarylethenes because of intramolecular charge transfer. Both "turn-on" and "turn-off" fluorescent diarylethenes systems can be achieved by simple modification of molecular structure and electronic properties of substituent, which provides a strategy for the design of new fluorescent diarylethene systems to be used as switches.
authors.affiliation: Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100080, China.
authors.forename: Huan-huan
authors.initials: HH
authors.lastname: Liu
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen