Abstract
Abstract Recent experimental data concerning the rate constants for electron transfer reactions of organic systems in aqueous solutions and their equilibrium constants is examined for possible correlation. The data is correlated quite well by the Marcus theory, if a reorganization parameter, λ, of 18 kcal/mole is used. Assuming that the only contribution to λ is the free energy of rearrangement of the water molecules, an effective radius of 5A˚for the reacting entities is estimated. For the zero free energy change reaction, i.e., electron exchange between a radical ion and its parent molecule, a rate constant of about 5 × 10 7 M −1 s −1 is predicted.
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