ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Kinetic study of oxidation of glyceraldehyde by the cerium(IV) ions

M. Melicherčík and Ľ. Treindl

Department of Chemistry, Faculty of Pedagogy, CS-97549 Banská Bystrica

Abstract:

The kinetics and mechanism of oxidation of glyceraldehyde by cerium(IV) sulfate in a solution of sulfuric acid were studied. The reaction is a first-order reaction with respect to concentration of the Ce(IV) ions as well as with respect to concentration of the substrate. The value of experi­mental rate constant nonlinearly decreases with increasing concentration of the HS0₄^- ions. It also decreases after addition of the Ce(III) ions. The activation enthalpy (ΔH^≠ = 78.1 kJ mol^-1 ) and the activation entropy (ΔS^≠ = - ЗЗ J К^-1mol^-1 ) were evaluated from the temperature depen­dence of the rate constant by using the Eyring equation. The probable reaction mechanism is discussed. It is assumed that the reaction proceeds through an intermediary complex the intramolecular decay of which is the rate-determining step. In the subsequent step the intermediary radical is attached by another Ce(IV) ion.

Full paper in Portable Document Format: 424a433.pdf

Chemical Papers 42 (4) 433–438 (1988)