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Kinetic studies and mechanism on the permanganic oxidation of L‐Glutamine in strong acid medium in the presence and absence of Silver (I)
Author(s) -
Iloukhani Hossein,
Bahrami Homayoon
Publication year - 1999
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1999)31:2<95::aid-kin3>3.0.co;2-u
Subject(s) - chemistry , arrhenius equation , kinetic energy , sulfuric acid , mechanism (biology) , glutamine , proton , reaction mechanism , kinetics , reaction rate , catalysis , computational chemistry , inorganic chemistry , organic chemistry , activation energy , amino acid , biochemistry , philosophy , physics , epistemology , quantum mechanics
The kinetic study and mechanism of the permanganic oxidation of L‐glutamine in sulfuric acid has been carried out both in the absence and presence of silver (I) using a spectrophotometric technique. Activation parameters have been evaluated using the Arrhenius and Eyring plots. Mechanisms consistent with the observed kinetic data have been proposed and discussed. The overall rate expression for the oxidation may be written as$${- d\ \hbox{\rm [Mn(VII)]}\over d\ t}= k_{0}\ \hbox{\rm [L-Glutamine]\ [Mn(VII)]}$$ In the presence of silver (I) the rate law is$${- d\ \hbox{\rm [Mn(VII)]}\over d\ t}={{\rm K} k_{c}\ \!\!''\ \hbox{\rm [L-Glutamine]}_{0}\ \hbox{\rm [Ag}^{+}]\over \rm 1+\hbox{\rm K [Ag}^{+}]\ +\hbox{\rm K [L-Glutamine]}}\cdot \hbox{{\rm [Mn(VII)]}}$$ The reaction appears to involve an acid catalyzed and data showed role of water molecules in the rate‐determining step is proton transfer which satisfies Bunnett's theory. A mechanism satisfying the various kinetic parameters has been proposed. ©1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 95–102, 1999