Abstract

Long-distance, intramolecular charge recombination following photoexcitation of a series of rigid donor-insulator-acceptor molecules dissolved in n-hexane, cyclohexane and trans-decalin has been monitored using the time-resolved microwave conductivity (TRMC) technique. Two recombination pathways are found to be operative; a direct transition to the ground state which is temperature and solvent independent and an indirect route via the local excited donor which is thermally activated and dependent on the polarisability of the medium. The latter pathway becomes important when the charge-separated state and the local excited state are close to being degenerate.

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