Efficient blue light-responsed dithienylethenes with exceptional photochromic performance

摘要

Three novel dithienylethenes modified by bifluoroboron beta-diketonate fragments have been successfully developed. Upon blue light irradiation, they reached photostationary state within 2-5 s, as well as 100% conversion ratio and photocyclization quantum yield of > 0.70. Such fascinating photochromism were endowed by collaborative role of electron-withdrawing effect of BF2bdk group to reduce HOMO-LUMO electronic gap for the open isomer, together with intramolecular hydrogen bonds and CH-pi interactions favoring antiparallel conformation fixation. Moreover, they displayed specific discrimination and photo-switchable bacterial imaging for S. aureus.

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