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Matsuo, Yutaka; Wang, Ya; Ueno, Hiroshi; Nakagawa, Takafumi; Okada, Hiroshi
Angewandte Chemie International Edition, June 24, 2019, Letnik: 58, Številka: 26Journal Article
(N‐Phenylfluorenylidene)acridane (Ph‐FA) compounds with electron‐withdrawing and ‐donating substituents (H, MeO, Ph, NO2, Br, F) at the para position of the phenyl group were successfully synthesized by Barton–Kellogg reactions of N‐aryl thioacridones and diazofluorene. By using the substituent on the nitrogen atom to alter the electronic properties, both the folded and twisted conformers of p‐NO2‐C6H4‐FA could be crystallographically characterized, which enabled the charge transfer from the electron‐donating acridane moiety to the electron‐accepting fluorenylidene moiety to be understood. Ground‐state mechanochromism, thermochromism, vapochromism, and proton‐induced chromism were demonstrated between the folded and twisted conformations of the conformers. Protonation and chemical oxidation of Ph‐FA gave two stable acridinium compounds, namely, the fluorenylacridinium and acridinium radical cations. The present study will contribute to the development of functional dyes and organic semiconductors. Color control: (N‐Phenylfluorenylidene)acridane compounds with electron‐withdrawing and ‐donating substituents at the para position of the phenyl group were synthesized and the X‐ray crystal structures of both the folded and twisted conformers of the nitro derivative determined. Not only do the compounds show various chromic properties, carrier transport properties are also evident.
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