Rhodium(iii)‎ catalyzed oxidation of some amino-acids by acid potassium bromate a kinetic study

الملخص EN

Kinetic investigation in Rh (III) catalyzed oxidation of Asparagine and Alanine in an acidified solution of potassium bromate in the presence of Hg (OAc)2 as a scavenger, have been studied in the temperature range of 30- 45 °C.

Increase in concentration of oxidant and H + ion showed fractional positive order and fractional inverse order respectively.

The influence of Hg (OAc) 2, ionic strength and Cl- ion on the rate was found to be insignificant.

First order kinetics was observed in case of catalyst Rh (III), Rh3+ being its reactive species.

The order of reaction w.

r.

t.

substrate is zero.

The various thermodynamic parameters were calculated from rate measurements at 30, 35, 40 and 45 °C respectively.

A suitable mechanism in conformity with the kinetic observations has been proposed and the rate law is derived on the basis of obtained data.

A transient complex formed between Rh (III) and oxidant, dissociate in a slow and rate determining step, which further reacts with amino-acids to give the products in a series of fast steps.