Viscosity dependence of the specific rates of the diffusion-controlled reactions of the solvated electron in polar solvents

In hydroxlyic solvents, the specific rates, k, of some diffusion-controlled reactions of e /SUB s/ - with neutral molecules are proportional to /eta/ /SUP -n/ , where /eta/ is the viscosity of the solvent and n is smaller than 1. This proportionality does not hold for all situations. Specifically, for alcohol-water mixtures, the relationship of k with /eta/ is very complex. For some diffusioncontrolled reactions of e /SUB s/ - with neutral molecules in 1-alkanols, k is proportional to (L + X) /SUP -m/ , where L is the maximum linear length of the 1-alkanol molecule and X is the cavity radius of e /SUB s/ -. Some implications of this proportionality are discussed