European Journal of Chemistry

Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach

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Jayachamarajapura Pranesh Shubha
Kotabagi Vinutha
Puttaswamy Puttaswamy


The kinetics of oxidative decolorization of amido black (AB, Naphthol blue black) by chloramine-T (CAT) and bromamine-T (BAT) in acidic medium has been investigated spectrophotometrically (λmax = 618 nm) at 298 K. Kinetic runs were performed under pseudo first-order conditions of [Oxidant]o >> [AB]o. Under identical experimental conditions, reactions with both the oxidants follow identical kinetics with a first-order dependence on each [Oxidant]o and [AB] and a fractional-order dependence on [HClO4]. Stoichiometry of the reaction was found to be 1:4 and the oxidation products were identified. The reaction was studied at different temperatures and various activation parameters have been computed. Effects of p-toluenesulfonamide, halide ions, ionic strength and dielectric constant of the medium have been investigated. Reaction mixture fails to induce polymerization of acrylonitrile. The rate of oxidation of AB is about three-fold faster with BAT as compared to CAT. This may be attributed to the difference in electrophilicity of Cl+ and Br+ ions and also the Vander Waals radii of chlorine and bromine. Plausible mechanism and related rate law have been deliberated for the observed kinetics.


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Shubha, J. P.; Vinutha, K.; Puttaswamy, P. Kinetics and Mechanism of Oxidation of Amido Black by Sodium N-Halo-P-Toluenesulfonamides in Acidic Medium: Spectrophotometric Approach. Eur. J. Chem. 2013, 4, 408-413.

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Supporting Agencies

Don Bosco Institute of Technology, Kumbalagodu, Bangalore-560074, India, Visvesvaraya Technological University Research Grants, NO VTU/Aca./2012-13/A-9/2439.

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