Photoinduced electron transfer of fullerenes (C60 and C70) studied by transient absorption measurements in near-IR region

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 ΦctT was evaluated by the ratio of [C60−+]/[TC60*] (or [C70−+/[TC70*]). The ΦctT 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.

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