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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Weitzel, Karl-Michael

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Effect of CTAB Micelle on the Oxidation of L-Leucine by N-Bromophthalimide: a Kinetic Study

Yokraj Katre* / Namita Goyal1 / Ajaya Kumar Singh2

1 Department of Chemistry, Kalyan Post Graduate College, Bhilai Nagar, Durg, Chhattisgarh 490006, Indien

2 Department of Chemistry, Government Vishwanath Yadav Tamaskar Post Graduate, Indien

* Correspondence address: Department of Chemistry, Kalyan Post Graduate College, Bhilai Nagar, Durg, Chhattisgarh 490006, Indien

Citation Information: Zeitschrift für Physikalische Chemie International journal of research in physical chemistry and chemical physics. Volume 225, Issue 1, Pages 107–124, ISSN (Print) 0942-9352, DOI: 10.1524/zpch.2011.0004, November 2010

Publication History

Published Online:
2010-11-17

Abstract

The effect of cationic surfactant cetyltrimethylammonium bromide (CTAB) on the oxidation of L-leucine by N-bromophthalimide (NBP) has been studied at 308 K. The reaction exhibits first order dependence on NBP and L-leucine and negative and fractional order dependence on HClO4. The effects of KCl, KBr, phthalimide and mercuric acetate have also been studied and summarized. The rate of reaction increased with an increase in dielectric constant of the medium. CTAB strongly catalyzes the reaction and typical kobs and CTAB profile was observed, i.e., with a progressive increase in CTAB, the reaction rate increased and after achieving a peak kobs decreased at higher concentrations of CTAB. The results are treated quantitatively in terms of “Piszkiewicz” and “Raghvan and Srinivasan's” models. The various activation parameters in presence and absence of CTAB have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The rate constant in micellar phase kM, cooperativity index (n), binding constant (K1 and K2) have been computed.

Keywords: Micellar Kinetics; N-Bromophthalimide; L-Leucine; Oxidation

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