Extending the Lifetimes of Charge Transfer States Generated by Photoinduced Heterolysis of Photochromic Radical Complexes. Issue 4 (19th March 2021)

• Record Type: Journal Article
• Authors: Kawanishi, Yasuki; Mutoh, Katsuya; Abe, Jiro; Kobayashi, Yoichi
• Is Part Of: Asian journal of organic chemistry. Volume 10:Issue 4(2021)
• Page Start: 891
• Page End: 900
• Publication Date: 2021-03-19
• Subjects: photochromism -- heterolysis -- charge transfer -- radical -- transient absorption; Chemistry, Organic -- Periodicals; Organic compounds -- Synthesis -- Periodicals; 547.005
• DOI: 10.1002/ajoc.202100032
• Languages: English
• ISSNs: 2193-5807

Abstract

Abstract: Novel 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. Abstract : We developed novel fast photochromic phenothiazine‐imidazolyl radical complex (PTIC) derivatives, which form the charge transfer (CT) states and the neutral open‐shell transient species in a stepwise manner upon light irradiation, and succeeded in extending the lifetimes of the CT states from picoseconds to hundreds of picoseconds by the substitution of a triphenylamine group on the phenothiazine moiety.