The kinetics of oxidation of [CoI~(EDTA)] 2 (EDTA = ethylenediaminetetraacetate) by N-bromosuccinimide (NBS) in aqueous solution obey the equation:where k2 is the rate constant for the electron-transfer process, K 2 the equilibrium constant for the dissociation of [Con(EDTAH)(H20)] -to [CoJ'(EDTA)(OH)] 3-and K 3 the pre-equilibrium formation constant. The activation parameters are reported. It is proposed that electron transfer proceeds via an inner-sphere mechanism with the formation of an intermediate which slowly generates hexadentate [Com(EDTA)]-.
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