Kinetics and Mechanism of Oxidation of Indigocarmine by N-Sodio-N-Bromobenzenesulphonamide (Bromamin-B) in Acid Buffer Medium

Abstract

Kinetics of oxidation of indigocarmine [IC] by bromamine-B inpH 5 buffer medium has been studied at 30°C spectrophotometricallyat   λ_max  610 nm. The reaction is first order with respect to [IC]and second order with respect to [BAB]. The reaction rate showsan inverse first order on [benzenesulphonamide].. Addition of halideions and variation of ionic strength of the medium have no influenceon the reaction rate. There is a negative effect of dielectric constantof the solvent. Activation parameters have been calculated. Mechanismproposed and the derived rate laws are consistent withobserved kinetics.