KINETIC STUDY OF RUTHENIUM(III) CATALYSED OXIDATION OF MALTOSE BY BROMATE IN ACIDIC MEDIUM

摘要

Kinetic investigation in ruthenium(III) catalysed oxidation of maltose by an acidified solution of KBrO_3 in the presence of mercuric acetate as a scavenger for Br ion has been carried out in temperature range 30-45 deg C.First order kinetics in the lower KBrO_3 concentration range tended to zero order at higher concentration.The order of reaction with respect to substrate is zero,but the order with respect to Ru(III) is one.Increase in [Cl~-] shows negligible effect while increase in [H~+] shows negative effect.Negligible effect of mercuric acetate and ionic strength of the medium was observed.D_2O has an insignificant effect on the reaction rate.A suitable mechanism in conformity with the kinetic observations has been proposed and the various activation parameters have been calculated.