On the frequency factor in electron transfer reactions and its role in the highly exothermic regime

Consideration of current information on the dependence of the electron transfer rate on the radial separation distance and on the reactants′ radial distribution function suggests for adiabatic transfers a frequency factor closer to 10 12 M −1 s −1 than to 10 11 M −1 s −1 . One effect is to raise the λ values estimated from self‐exchange rate constants, and to extend thereby the range of Δ G °'s in which the “inverted region′” is masked by a diffusion‐controlled reaction rate.