CHARGE SEPARATION, CHARGE RECOMBINATION AND ELECTRON-TRANSFER REACTIONS IN SOLUTIONS OF FULLERENE-C-60 AND PHENOTHIAZINES

C-60 forms weak charge transfer complexes with phenothiazine and methy l phenothiazine. Charge separation, charge recombination and ion disso ciation reactions were investigated in the solution phase following ex citation of the charge transfer band of the complexes with picosecond laser pulses. The formation of the triplet state of C-60 on charge rec ombination, and electron transfer reactions of the singlet and triplet states of C-60 with phenothiazine to give C-60(-.) and cation radical s have been investigated. On longer timescales (> 1 mu s) back electro n transfer between C-60(-.) and cation radical takes place. The effect of solvent polarity was studied on the charge recombination and back electron transfer reactions.