Impact of Double‐π‐Bridge on Bis(Triarylamine)‐Based Organic Mixed‐Valence System: A Case Study of Diaza[1.1](4,4”)<i>ortho</i>‐Terphenylophane Radical Cation

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.