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Abstract
AbstractNovel fast photochromic phenothiazine‐imidazolyl radical complex (PTIC) derivatives were developed, which form the charge transfer (CT) states and the neutral open‐shell transient species in a stepwise manner upon light irradiation. The lifetimes of the CT states were extended from picoseconds to hundreds of picoseconds by the substitution of a triphenylamine group on the phenothiazine moiety. The CT forms have different optical properties and chemical reactivities from those of the neutral open‐shell transient species. Therefore, the developments of fast T‐type photochromic molecules that generate long‐lived CT forms are important for expanding potential applications of fast photoswitching materials.
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