Influence of specific adsorption of reactant and product upon charge-transfer processes in polarography. The azobenzene–hydrazobenzene system

Abstract

An examination of the polarograms of azobenzene and hydrazobenzene in media of differing pH has allowed conclusions as to the mechanism of the azobenzene-hydrazobenzene electrode process on mercury to be drawn. The shifts of the above polarograms towards increasing overpotentials with an increase in the reactant concentration have been attributed to azobenzene adsorption. A quantitative examination of this effect has allowed the value K₀= 2.8 × 10³ l. mol^–1 to be attributed to the adsorption coefficient of azobenzene in a pH 9, 90 %(v/v) ethanol + water mixture.