Electron-Transfer Kinetic Reactions of Binary & Ternary Complexes

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The present work comprises a study of the kinetics and mechanism of oxidation of binary and ternary cobalt (II) complexes involving CoII ADA and malonic , succinic , or maleic acids by periodateThe kinetics of oxidation of [CoII(ADA)(H2O)3], [CoII(ADA)(M)(H2O)]2- , [CoII(ADA)(Su)(H2O)]2-and [CoII(ADA)(Ma)(H2O)]2- by periodate in aqueous solutions have been studied. Oxidation of CoII complexes show the formation of an initial CoIII product. This may be due to the oxidation process being inner sphere. This is consistent with inner sphere oxidation which are generally proposed for IO4- reactions. Through transformation of initial to final CoIII product an IVI in the initial product is probably substituted by a water molecule with a slow rate due to inertness of CoIII Comprises the layout of the results obtained and their discussions. The effect of various parameters on the rate of reaction has been discussed. An inner- sphere process may be still accommodating through replacement of coordinate H2O by periodate species. The enthalpy of activation ¿H* and entropy of activation ¿S* also were calculated.