Efficiencies and rates of electron transfer from various electron donors to excited fullerenes (C60 and C70) have been determined by observing the transient absorption bands in the near-IR region, where the anion radicals of fullerenes appear. From the rise of the absorption bands of C60 −+ and C70 −+ in the near-IR region, electron transfer takes place via the triplet states (TC60 * and TC70 *) under appropriately low concentrations of electron donors. By analysis of the rise curves C60 −+ and C70 −+, contribution of the excited singlet states (SC60 * and SC70 *) in addition to the route of the triplet states (TC60 * and TC70 *) is confirmed. The quantum yield for electron transfer via the triplet states Φct T was evaluated by the ratio of [C60 −+]/[TC60 *] (or [C70 −+/[TC70 *]). The Φct T depends upon the donor-ability, donor concentration, and solvent polarity. The back electron-transfer process, which was evaluated by observing C60 −+, also depends upon the solvent polarity.
Research on Chemical Intermediates – Springer Journals
Published: Apr 14, 2009
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