Picosecond absorption spectroscopy has been employed in the study of the dynamics of proton
transfer within substituted benzophenones/N,N-dimethylaniline contact radical ion pairs. The reactions were
investigated in the solvents cyclohexane, benzene, and dimethylformamide. The correlation of the reaction
rates with the change in free energy reveals that the reaction pathway corresponds to a nonadiabatic process,
that is the reaction proceeds by proton tunneling. In nonpolar solvents, an “inverted region” is observed in the
proton-transfer process.
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