COBALTOCENIUM DIFFUSION COEFFICIENTS EVALUATION BY ELECTROCHEMISTRY IN ACETONITRILE AND DIMETHYL SULFOXIDE

Cobaltocenium diffusion coefficients have been evaluated by electrochemistry in two organic solvents, acetonitrile or dimethyl sulfoxide, at different temperatures in the presence of tetrabutylammonium perchlorate as electrolyte. The data have been obtained by cyclic voltammetry, potential-step chronoamperometry, rotating disk electrode and differential pulse voltammetry for different cobaltocenium concentrations. Randles-Sevick and Cottrell equations have been used to calculate the diffusion coefficients. Validity of Stokes-Einstein equation has been checked in both solvents.