Radical monocations of symmetrical triarylamines such as 1 show intense intervalence charge-transfer (IV-CT) bands in the NIR spectra. These bands refer to photoinduced degenerate electron transfers (ET) between two amine redox centers. Hush analysis of the IV-CT bands revealed a very strong electronic coupling between the redox centers in 1+ compared to the total reorganization energy for the ET process. This results in a very fast thermal electron transfer.
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Lambert et al. (1998) studied this question.