Impact of Double-π-Bridge on Bis(Triarylamine)-Based Organic Mixed-Valence System: A Case Study of Diaza[1.1](4,4”)ortho-Terphenylophane Radical Cation
Koshi Yoshida, Fumiya Takasaki, Dr. Masashi Uebe, Prof. Dr. Shu Seki, Prof. Dr. Akihiro Ito
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Abstract
A bis(triarylamine) (BTA) radical cation, bridged by two o-terphenylene moieties, was prepared and characterized to explore the impact of the double-π-bridge on the intramolecular charge/spin transfer process in the 2-site organic mixed-valence (MV) compound. Spectroscopic analyses on optically and thermally assisted intervalence charge-transfer (IVCT) processes revealed that the doubly π-bridging enhanced the charge delocalization between two nitrogen redox-active centers, whereas the electronic coupling was not so strengthened, in comparison with the singly π-bridging reference compound.
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