Manganese (III) oxidation of some neutral amino acids in pyrophosphate medium: A kinetic and mechanistic study

Chandraju, S. and Mahadevappa, D. S. and Rangappa, K. S. (1997) Manganese (III) oxidation of some neutral amino acids in pyrophosphate medium: A kinetic and mechanistic study. Indian Journal of Chemistry Section a-Inorganic Bio-Inorganic Physical Theoretical & Analytical Chemistry, 36 (11). pp. 974-980. ISSN 0975-0975

Text Manganese III oxidation of some neutral amino acids in pyrophosphate medium - A kinetic and mechanistic study.pdf Restricted to Registered users only Download (647kB) | Request a copy

Abstract

Kinetics of oxidation of L-serine, L-phenylalanine, DL-alanine, DL-valine and DL-threonine (AA) by manganese (III) ions have been studied as a function of pH (0.91-1.45) at 328K. The reaction shows a first order dependence each in Mn-III]o and AA]o, inverse fractional order each in the added Na4P2O7] and Mn-II] and a fractional order in H+]. Effect of the added anions and varying solvent composition have also been studied. Solvent isotope studies have been made in D2O medium. Activation parameters are computed from Arrhenius-Eyring plots. An isokinetic relationship is noted and the isokinetic temperature beta = 340K, indicating enthalpy control on the reactions. Taft linear free energy relationship is observed with rho* = -0.43 indicating an electron deficiency transition state. A mechanism consistent with the observed results is proposed and discussed.

Item Type:	Article
Subjects:	C Chemical Science > Chemistry
Divisions:	Department of > Chemistry
Depositing User:	Users 23 not found.
Date Deposited:	05 Jun 2021 05:34
Last Modified:	04 Jul 2022 09:24
URI:	http://eprints.uni-mysore.ac.in/id/eprint/16591

Actions (login required)

View Item