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One- and Two-Dimensional Electron Transfer Processes in Triarylamines with Multiple Redox Centers
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1998
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EngineeringTwo-dimensional Electron TransferExcitation Energy TransferChemistryElectronic Excited StateSymmetrical TriarylaminesRedox ChemistryPhotophysical PropertyRedox CentersBiophysicsPhotochemistryPhysicsMechanistic PhotochemistryPhysical ChemistryMultiple Redox CentersQuantum ChemistryNatural SciencesChemical KineticsAmine Redox Centers
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.