Collect. Czech. Chem. Commun. 1981, 46, 1734-1739

Kinetics of oxidation of 2,4-pentanedione with Ce(IV) ions in relation to Belousov-Zhabotinskii reaction

Ľudovít Treindl and Peter Kaplán

Department of Physical Chemistry, Comenius University, 816 50 Bratislava


Oxidation of 2,4-pentanedione with Ce(IV) ions in a solution of sulphuric acid is an inner-sphere reaction which proceeds via an intermediary complex. The reaction is of the first order with respect to both reactants, it is catalysed with H3O+ ions, and its rate diminishes with increasing concentrations of HSO4- and Ce(III) ions. According to the proposed mechanism, the rate-determining reaction step is an intramolecular redox step of the intermediary complex. The modified Belousov-Zhabotinskii reaction with 2,4-pentanedione as substrate is interesting in that oscillations with an increasing amplitude are formed after an induction period even in the absence of stirring.