Collect. Czech. Chem. Commun. 1980, 45, 26-31

Kinetics and mechanism of redox reaction of U(III) ions with trichloroacetic acid

Ľubica Adamčíková and Ľudovít Treindl

Department of Physical Chemistry, Comenius University, 816 50 Bratislava


The kinetics and mechanism of redox reaction of U3+ ions with trichloroacetic acid in the medium of perchloric acid were studied. The form of the dependence of the rate constant on the concentration of H3O+ ions suggests that the U3+ion reacts in the first elementary step with the CCL3.COO- anion under formation of an intermediary radical which reacts rapidly in the second step.The results of kinetic measurements of all three chloro substituted acetic acids are compared. A detailed study of the influence of binary mixtures on kinetic parameters of the studied reaction (especially of water-tert-butanol mixtures) shows that the reduction of chloroacetic acids with U3+ ions proceeds by the outer sphere mechanism of the electron transfer.