Electrochemical Behaviour of 5-Methyl-4-(2-Thiazolylazo)-Resorcinol in Micellar Media

Abstract

In this study, surfactant effects on the spectroscopic and electrochemical behavior of 5-Methyl-4-(2thiazolylazo)-resorcinol were studied in an aqueous solution at neutral pH. Dodecylpyridinium chloride (DDPC), cetylpyridinium chloride (CPC) (cationic), Triton X100, Tween 20 (nonionic), and sodium dodecyl sulfate (SDS) (anionic), were used in investigation. A large bathochromic shift of absorption maxima of the dye was observed upon the addition of surfactant. Electrochemical reduction of the dye was investigated by cyclic voltammetry (CV). The adsorption-controlled reduction reaction of the dye changed to a semireversible diffusion-controlled reduction peak at -0.43 V by the addition of CPC. Depending on the CPC concentration in the dye solution, the peak potential of the electrode reaction shifted about 120 mV in the cathodic direction and the peak current decreased up to ten times. These changes were interpreted depending on the type and concentration of surfactant present in the solution.