Kinetics and mechanism of L-isoleucine oxidation by alkaline diperiodatoargentate(III)

Suresh D. Kulkarni, Sharanappa T. Nandibewoor

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The oxidation of L-isoleucine by alkaline diperiodatoargentate(III) (DPA) at 298 K and a constant ionic strength of 0.80 mol dm-3 was studied spectrophotometrically. The stoichiometry is [L-isoleucine]: [DPA] = 1:2. The reaction is first order in [DPA] and has less than unit order in both [L-isoleucine] and [alkali] and retarding effect in [IO4̄]. The oxidation reaction in alkaline medium has been shown to proceed via a L-isoleucine-DPA complex, which further reacts with one molecule of DPA in a rate determining step followed by other fast steps to give the products. Spot test and IR were used to identify the main products. The reaction constants involved in the different steps of the mechanism are calculated. The activation parameters with respect to the slow step of the mechanism are computed and discussed, and thermodynamic quantities are also determined. The probable active species of oxidant have been identified.

Original languageEnglish
Pages (from-to)23-28
Number of pages6
JournalTransition Metal Chemistry
Volume33
Issue number1
DOIs
Publication statusPublished - 01-02-2008

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Isoleucine
Oxidation
Kinetics
Ionic strength
Oxidants
Stoichiometry
Rate constants
Chemical activation
Thermodynamics
Molecules
Alkalies
diperiodatoargentate(III)

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

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abstract = "The oxidation of L-isoleucine by alkaline diperiodatoargentate(III) (DPA) at 298 K and a constant ionic strength of 0.80 mol dm-3 was studied spectrophotometrically. The stoichiometry is [L-isoleucine]: [DPA] = 1:2. The reaction is first order in [DPA] and has less than unit order in both [L-isoleucine] and [alkali] and retarding effect in [IO4̄]. The oxidation reaction in alkaline medium has been shown to proceed via a L-isoleucine-DPA complex, which further reacts with one molecule of DPA in a rate determining step followed by other fast steps to give the products. Spot test and IR were used to identify the main products. The reaction constants involved in the different steps of the mechanism are calculated. The activation parameters with respect to the slow step of the mechanism are computed and discussed, and thermodynamic quantities are also determined. The probable active species of oxidant have been identified.",
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Kinetics and mechanism of L-isoleucine oxidation by alkaline diperiodatoargentate(III). / Kulkarni, Suresh D.; Nandibewoor, Sharanappa T.

In: Transition Metal Chemistry, Vol. 33, No. 1, 01.02.2008, p. 23-28.

Research output: Contribution to journalArticle

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AB - The oxidation of L-isoleucine by alkaline diperiodatoargentate(III) (DPA) at 298 K and a constant ionic strength of 0.80 mol dm-3 was studied spectrophotometrically. The stoichiometry is [L-isoleucine]: [DPA] = 1:2. The reaction is first order in [DPA] and has less than unit order in both [L-isoleucine] and [alkali] and retarding effect in [IO4̄]. The oxidation reaction in alkaline medium has been shown to proceed via a L-isoleucine-DPA complex, which further reacts with one molecule of DPA in a rate determining step followed by other fast steps to give the products. Spot test and IR were used to identify the main products. The reaction constants involved in the different steps of the mechanism are calculated. The activation parameters with respect to the slow step of the mechanism are computed and discussed, and thermodynamic quantities are also determined. The probable active species of oxidant have been identified.

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