Synthesis and Photochromic Properties of 1-(Thien-3-yl)-2-(thien-2-yl)ethene Having Bromo at 4-Position of Thiophene Moieties

Abstract:

1-(2,5-Dimethyl-thien-3-yl)-2-(4-bromo-3,5-dimethyl-thien-2-yl)perfluorocyclopentene has been synthesized. The open-ring isomer of the compound in hexane is colorless and the absorption maximum was observed at 316 nm (ε = 8700M^-1cm^-1). The close-ring isomer of the compound in hexane is yellow and the absorption maximum was observed at 468 nm (ε = 6280M^-1cm^-1). Upon irradiation with 313 nm light, the conversion from the open- to the closed-ring isomer of the compound εwas 72% in the photostationary state. Bromo at 4-position of the thiophene moieties does not affect the absorption maximum and changes slightly absorption coefficient.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 743-747
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.743
• Online since: July 2012
• Authors: Sheng Min Zhao, Rui Zhao, Xian Chen, Wen Guan Zhang
• Keywords: Diarylethene, Photochromism, Substituent Effect

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