Measurements of redox kinetics of adsorbed azobenzene by “a quasireversible maximum” in square-wave voltammetry

Abstract

The standard redox reaction rate constants of azobenzene adsorbed to the mercury electrode are k s = 350 ± 25 s − 1 in the acidic perchlorate medium (pH 2) and k s = 175 ± 20 s − 1 in the acetate buffer pH 4.7. Under the influence of 0.2%, 0.5% and 1% acetonitrile in these electrolytes, the rate constants are reduced to 265 ± 5 s − 1, 160 ± 20 s −1 and 77 ± 10 s −1, at pH 2, and to 150 ± 5 s −1 and 56 ± 13 s −1 at pH 4.7.