On the Polarographic Reduction Mechanism of Some Heterocyclic Compounds

Department of Chemistry, University of Roorkee, Roorkee-247 672 For evaluating the mechanistic steps, position at d.m.e and assigning inner or outer sphere path of electrode processes of a number, of pyrazole derivatives. thiazoles and their precursors experiments were carried out m the absence and presence of surfactants. All the compounds gave diffusion-controlled, irreversible waves over the entire pH range (2.0-11.0) studied. In presence of surfactants also, diffusioncontrolled but more Irreversible waves were obtained. In absence and presence of surfactant (CTAB) values of K\(a p p\) and \(\propto\)\(a p p\) for all these compounds were calculated and have been taken as a proof of inner sphere or outer sphere path of the electrode reaction. Results have been explained on the basis of formation of phenylazo-functionalised surfactant as an intermediate species