Abstract
Abstract The oxidation of NADH is readily obtained in the presence of Dawson-type heteropolyanions (HPA). A stoichiometry of 2:1 is established for the oxometalate/NADH couple. The starring system for electrochemistry studies consists of the one-electron reduction product of the heteropolyanions in the presence of various amounts of NADH. The quantitative study by cyclic voltammetry confirms that the oxidized form of the selected HPAs are capable of catalyzing the oxidation of NADH. The kinetics were studied quantitatively by double-step chronocoulometry. The logarithm of the second-order rate constant varies linearly with the E o of the first redox system of the HPAs with a slope of 16.4 V −1 , indicating that the oxidation of NADH proceeds by a multistep mechanism involving an initial rate-limiting one-electron transfer. The E o value for the NADH/ NADH ·+ redox couple has been estimated.
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