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Rhodium(III) as a homogeneous catalyst for the oxidative decolorization of ethyl orange with aqueous acidic chloramine-T: a spectrophotometric, kinetic and mechanistic study

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Abstract

The kinetics and mechanism of sodium N-chloro-p-toluenesulfonamide oxidative decolorization of ethyl orange (EO) in aqueous perchloric acid have been studied at 303 K in the presence of rhodium(III) chloride as catalyst. The reaction exhibits first-order dependence on [EO]o and a fractional-order dependence on [CAT]o, [H+] and [RhIII]. The dielectric effect is positive. The stoichiometry of the reaction was found to be 1:1, and the oxidation products of EO were identified as N-(4-diethylamino-phenyl)-hydroxylamine and 4-nitroso-benzenesulfonic acid. The rhodium(III)-catalyzed reaction is about fourfold faster than the uncatalyzed reaction. The proposed mechanism and derived rate law are in agreement with the observed kinetic results.

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Acknowledgments

The authors greatly acknowledge the University Grant Commission, New Delhi for the award of UGC-Major Research Project. We thank Prof. M. A. Pasha of this department for his valuable suggestion on the reaction scheme.

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Authors and Affiliations

  1. Department of Chemistry, Bangalore University, Central College Campus, Bangalore, 560 001, India

    Adalagere Somashekar Manjunatha &  Puttaswamy

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  1. Adalagere Somashekar Manjunatha
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  2. Puttaswamy
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Correspondence to Puttaswamy.

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Manjunatha, A.S., Puttaswamy Rhodium(III) as a homogeneous catalyst for the oxidative decolorization of ethyl orange with aqueous acidic chloramine-T: a spectrophotometric, kinetic and mechanistic study. Transition Met Chem 38, 183–190 (2013). https://doi.org/10.1007/s11243-012-9676-2

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