Abstract
These photo-induced reactionsinvolve ring-opening (spiropyrans), cis-trans isomerization(azobenzene), phenyl migration (phenoxyquinones), andring-closure (bisthienylethene). In general, the photo-gene-rated isomers return to the initials upon visible light irradia-tion. Among the photochromic compounds, diarylethenederivatives are one of the most appealing materials becauseof their remarkably high photo-reactivity, photofatigue re-sistance, short response time as well as absence of thermalisomeriazation and large change in their optical and electronicproperties upon irradiation with UV and visible light.
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