Abstract
Kinetic studies of the oxidation of [CrIIIZ(H2O)](Z=N-phenylethylethylenediaminetriacetate) by periodate ion, to produce chromium(VI), were carried out in aqueous solutions. The reaction is first order with respect to both total chromium(III) and total periodate, and the rate is inversely dependent upon H+ in the 5.43–7.02 pH range. The reaction may follow a two-step inner-sphere electron transfer mechanism. The activated parameters are reported. Steric effects of the phenyl ring account for the smaller electron-transfer rate constants for [CrIIIZ(H2O)] compared to [CrIII(TOH)(H2O)], (TOH=N-(2-hydroxyethyl)ethylenediaminetriacetate).
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