Collect. Czech. Chem. Commun. 1989, 54, 3135-3143

Influence of substituents on electrochemical reduction potentials of benzenediazonium salts

Pavel Janderka and Igor Cejpek

Department of Theoretical and Physical Chemistry, J. E. Purkyně University, 611 37 Brno


TAST polarography, differential pulse polarography, and cyclic voltammetry on a hanging mercury drop and on a platinum disc were employed to measure the electrochemical reduction potentials of nine para substituted benzenediazonium salts in dimethylformamide. A satisfactory linear correlation was obtained between the potentials of the adsorption prewave and the substituent constants σ+p. The influence of substituents on some structural parameters was studied by using the CNDO/2 method for both a closed and a opened shell.