Diffusion of Photochemically Generated Intermediate Radicals in Water-Ethanol Mixed Solvents

ion from the water molecule may be smaller than that from the ethanol molecule. A main source of the experimental error in D comes from the fitting error of the double-exponential function.2b Recently, Donkers and Leaist have reported D of BQ and AP in ethanol determined by the Tayler dispersion (TD) method as 1.44 and 1.26 × 10-9 m2 s-1, respectively.39 Our values from the TG method are close to their values from the TD method within 10%. The fitting errors for the D values of the radicals should be smaller than those of the parent molecules (e10%).