Collect. Czech. Chem. Commun. 1990, 55, 63-71

The effect of the structure of the substituent in position ten on the voltammetric behaviour of phenothiazin derivatives

Naďa Zimováa, Ivan Němeca, Miroslava Ehlováa and Karel Waisserb

a Department of Analytical Chemistry, Charles University, 128 40 Prague 2
b Department of Inorganic and Organic Chemistry, 501 65 Hradec Králové


The electrochemical oxidation of seven derivatives of phenothiazin substituted in position 10 on the phenothiazin skeleton has been studied in acetonitrile, using a platinum disc electrode. The electron donor properties of the derivatives that depend on the substituent structure and the presence of nucleophiles in acetonitrile were followed. The diffusion coefficients for the formation of the radical cations were from 10-5 to 10-6 cm2 s-1 and depended on the concentration of the acid in acetonitrile medium. A determination of these substances has been proposed, using differential pulse voltammetry, with a detection limit of 1 . 10-7 mol l-1.