Variation of the electrochemical transfer coefficient in the electroreduction of aromatic two-ring disulfonyl difluorides

Abstract

An attempt has been made to describe quantitatively the variation of transfer coefficient with potential in the electroreduction of twelve aromatic two-ring disulfonyl fluorides of FO₂S-Ar-M-ArSO₂F type, where -M- is a bridging group. Each compound exhibits two two-electron steps of - SO₂F reduction. Linear relationship exists between αn and the potential, <i>E. </i> The average value of ∂α<i> /</i>∂<i>E </i> is 0.42 V^-1. The limiting values of potential corresponding to α = 1 and α =0 are calculated and discussed. The series of compounds covers ca. 40% of the total range of a variability.