Studies on electron transfer reactions of Keggin-type mixed addenda heteropolytungstovanadophosphates with NADH
作者： Ponnusamy Sami , Kasi Rajasekaran
DOI: 10.1007/S12039-009-0017-8
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摘要: The coenzyme nicotinamide adenine dinucleotide (NADH) undergoes facile electron transfer reaction with vanadium (V) substituted Keggin-type heteropolyanions (HPA) [PVVW11O40]4− (PV1) and [PVV2W10O40]5− (PV2) in aqueous phosphate buffer of pH 6 at ambient temperature. Electrochemical optical studies show that the stoichiometry is 1: 2 (NADH: HPA). EPR HPA act as one acceptor products reactions are reduced heteropoly blues (HPB), viz. [PVIVW11O40]5− [PVIVVVW10O40]6−. Oxygraph measurements there no uptake molecular oxygen during course reaction. proceeds through multi-step electron-proton-electron mechanism, rate limiting initial from NADH to by outer sphere process. Bimolecular constant for between PV2 = has been determined spectrophotometrically.
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