Elektrochemisches Verhalten der Nitrophenole und ihrer Reduktionsprodukte an Graphitelektroden, II Mechanismus und Kinetik / Electrochemical Behavior of the Nitrophenols and their Reduction Products at Graphite Electrodes, II Mechanism and Kinetic

Abstract

Abstract The mechanism of the electrochemical reactions of 1-nitro-2-naphthol, o-nitrophenol and p-nitrophenol at carbon fibre electrodes is investigated in aqueous solutions with pH= 1-10. The above nitrophenols are reduced to the corresponding amines, which are reoxidized to quinone imines. As the quinone imines are partially hydrolysed to quinones, the kinetic of this hydrolysis reaction is also examined. In the case of 1-nitro-2-naphthol the hydrolysis rate constant of 1,2-naphthoquinone imine is estimated as a function of pH by cyclic voltammetry.