Collect. Czech. Chem. Commun. 1988, 53, 976-986

Kinetics and mechanism of the reaction of iron(III) and 2,2,6,6-tetramethyl-3,5-heptanedione in aqueous solution

José M. Hernando, Carlos Blanco and Manuel Mateo

Departamentode Quimica Fisica, Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid, Spain


In this work the kinetic of formation of (2,2,6,6-tetramethyl-3,5-heptanedione)iron(III) complex (stoichiometry 1 : 1) has been studied in aqueous solution. It was found that the reaction is of first order with respect to diketone. The influence of several factors such as reagent concentrations, pH, ionic strength and temperature was systematically examined. A mechanism SN1 is proposed for the complexation process that accounts successfully for the experimental results.