Abstract
The title reaction was studied spectrophotometrically. The reaction was found to be first order in [HCF] and fractional order each in [dl-methionine] and [OH−]. Initially added products did not alter the rate of reaction. The variation of ionic strength had unaltered the rate of reaction whereas dielectric constant of the medium had an influence on k obs values. A suitable mechanism was proposed in which oxidant was involved in the formation of adduct (K 2) which is formed by reacting with dl-methionine in a prior equilibrium step. It decomposes in a slow step (k) to form a free radical generated on dl-methionine. This free radical leads to methionine sulfoxide in the fast step by reacting with another molecule of hexacyanoferrate(III). The effect of temperature on rate of reaction was also studied. Activation parameters were evaluated. The rate law was derived as: The reaction constants are calculated.
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