Mechanistic aspects of oxidation of alanine by Os VIII in aqueous alkaline medium. A kinetic model

P.G. Department of Chemistry, Govt. College Kota, Kota-324 001, Rajasthan, India

P.G. Department of Chemistry, Govt. J.D. B. Girls' College, Kota-324 001, Rajasthan, India

Department of Pure and Applied Chemistry, Kota University, Kota-324 005, Rajasthan, India

E-mail: ashu.uok@gmail.com

Manuscript received 20 July 2009, revised 17 May 2010, accepted 17 May 2010

Kinetics of oxidation of alanine by osmium(VIII) was studied In alkaline medium at 25 ºC. The reaction was found to have first order dependence each In [Os^VIII] and [alanine] and second order In [OH^-], which changed to zero order at higher concentration of [OH^-]. The main product of the oxidation Is the corresponding aldehyde. Temperature variation has also been studied for calculating different activation parameters. Spectroscopic: evidence for the complex formation between Os^VIII and substrate was obtained from a UV-Visible spectra of Os^VIII, alanine and mixture or both. A plausible mechanism has been proposed to account for the experimental results.