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Hydrogen bonding equilibria, redox potentials and quenching of tripletC60 in naphthol solutions containing added pyridines are studied by absorption spectroscopy, nanosecond flash photolysis and cyclic-voltammetry. It is shown that the quenching reaction involves reduction of the triplet by a hydrogen bonded naphthol-pyridine pair, with formation of C60 neutral naphthoxy radical and protonated base. Quenching rates increase with pyridine basicity, in parallel with decreased naphthol oxidation potential, and decrease with deuteration of the naphthol. It is concluded that electron and proton movement from die naphthol respectively to 3C60 and to base is concerted. Bulk radical yield increases with pyridine basicity and solvent polarity.
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Gupta et al. (1997) studied this question.
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