Kinetics of the dimerisation reaction of the iron(III)-ethylenediaminetetra-acetate complex

Abstract

The dimerisation reaction of the iron(III)-ethylenediaminetetra-acetate complex (FeEDTA−), has been studied at an ionic strength of 0.2 M in sodium perchlorate at 25° using a temperature jump relaxation technique. One relaxation is observed at high complex ion concentrations and the data are consistent with a two-step mechanism. Rate constants for the reaction: ▪ are k34 = 1.1 ± 0.3 × 104M−1 sec−1 and k43 = 1.7 ± 0.3 × 109M−1 sec−1 respectively. The forward rate constant is consistent with an SN 1 mechanism.