Analytical Sciences

Abstract − Analytical Sciences, 21(6), 685 (2005).

Electrochemical Investigation of 1,3,5-Triphenylformazan and Its Nitro Derivatives in Dimethyl Sulfoxide
Gültekin GöKÇE,* Zehra DURMUS,* Habibe TEZCAN,** Esma KILIÇ,* and Hamza YILMAZ*
*Department of Chemistry, Faculty of Science, Ankara University, Ankara, Turkey
**Department of Chemistry, Faculty of Gazi Education, Gazi University, Ankara, Turkey
Cyclic voltammetric (CV) and chronoamperometric (CA) behaviors of 1,3,5-triphenylformazan (TPF), 3-(p-nitrophenyl)-1,5-diphenylformazan (PNF) and 3-(m-nitrophenyl)-1,5-diphenylformazan (MNF) were studied in dimethyl sulfoxide medium. TPF was found to give a single sharp cathodic CV peak corresponding to a gain of one-electron per molecule. The diffusion coefficient and the number of electrons transferred were calculated using the Baranski equation with the CV-data obtained by an ultramicroelectrode. Standard rate constants for the reduction were calculated by the Klingler-Kochi technique. The electrochemical data obtained support the mechanism proposed by Umemoto.