Abstract
Hydrogen bonding effects on reorganization energies ( λ) in the photoinduced electron donor–acceptor system of duroquinone (DQ)–1,2,4-trimethoxybenzene (TMB) in benzonitrile have been investigated by time-resolved EPR and cyclic voltammetry measurements. The solvent reorganization energies ( λ S) determined for the radical ion pair systems involving the hydrogen-bonded complexes are larger by ∼0.2 eV than those calculated from the Marcus continuum dielectric model. The present results suggest that dissociation of the DQ anion–alcohol hydrogen-bonded complex results in the new component of λ S for the charge recombination reaction in polar solvents.
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