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Volume 14, Issue 3
  • ISSN: 1877-9468
  • E-ISSN: 1877-9476

Abstract

Introduction

The kinetic study of Ir (III) chloride-catalyzed oxidation of methionine by hexacyanoferrate (abbreviated as HCF) III ions in aqueous alkaline medium was performed spectrophotometrically at constant ionic strength of 0.5 moldm-3 and temperature of 35±0.1°C.

Methods

The progress of the reaction was found to be first-order rate dependence kinetics with respect to [HCF (III)], [OH-], and [IrCl]. The rate of reaction was found to decrease with an increased concentration of methionine. The ionic strength of the reaction mixture showed a positive salt effect on the reaction rate. Different activation parameters were also evaluated by studying the reaction at four different temperatures. The stoichiometry of the reaction showed Methionine: HCF (III) = 1:4.

Results

The oxidation product of the reaction was found to be methionine sulphone, which was identified by an organic solvent method and IR Spectroscopy. Further, a suitable mechanism was proposed to explain all the experimental results.

Conclusion

It is assumed that the reaction proceeded through complex formation between substrate (oxidant) and iridium trichloride. A rate law was derived, which verified the results.

CH-S-(CH)2-CH (NH)-COO- + 4HCF (III) CH-SO-(CH)2-CH-(NH)-COO- + 4HCF (II)

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2025-04-13

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A Kinetic and Mechanistic Study of Ir (III)-Catalyzed Oxidation of Methionine by HCF (III) in an Aqueous Alkaline Medium
Current Physical Chemistry 14, 194 (2024); https://doi.org/10.2174/0118779468300293240506112752
/content/journals/cpc/10.2174/0118779468300293240506112752
/content/journals/cpc/10.2174/0118779468300293240506112752
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  • Article Type:     Research Article
Keyword(s): hexacyanoferrate (III); Iridium (III); kinetics; mechanism; methionine; oxidation
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