Multicolour fluorescent “sulfide–sulfone” diarylethenes with high photo-fatigue resistance†
Abstract
Compact “push–pull” photochromic diaryethenes (DAEs) with unsymmetric oxidation pattern of the benzothiophene core display multicolour fluorescence switching, as a result of dual emission from both “open” and “closed” forms. These DAEs also present an unprecedented photo-fatigue resistance.