Mechanistic study of the oxidation of <Emphasis Type="SmallCaps">l</Emphasis>-phenylalanine by hexacyanoferrate(III) catalyzed by iridium(III) in aqueous alkaline medium |
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Authors: | Anjali Goel Shivani Sharma |
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Institution: | (1) Department of Chemistry, Kanya Gurukul Mahavidyalaya, Gurukul Kangri University, Jwalapur, Hardwar, 249407, UK |
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Abstract: | The oxidation of l-phenylalanine by hexacyanoferrate(III) (abbreviated as HCF) catalyzed by Ir(III) has been studied spectrophotometrically
at 35 °C and at a constant ionic strength of 0.50 mol dm−3. The main oxidation product was identified as phenylpyruvic acid by physico-chemical and spectroscopic methods. The stoichiometry
was found to be 2:1, i.e. 2 mol of hexacyanoferrate(III) reacted with 1 mol of phenylalanine. The reaction was first order
with respect to both HCF and alkali concentration. The order with respect to Phe] changed from first to zero as the concentration
was increased. The effect of ionic strength was also investigated. Thermodynamic parameters were evaluated by studying the
reaction at four different temperatures between 35 and 50 °C. Based on the experimental results, a suitable mechanism involving
complex formation has been proposed. |
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Keywords: | |
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