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ELECTROCHEMISTRY OF TRICARBONYL(ETA-6-1,3,5-CYCLOHEPTATRIENE)METAL(O) COMPLEXES OF THE GROUP-6B ELEMENTS IN APROTIC MEDIA

The electrochemistry of tricarbonyl(η6-1,3,5- cycloheptatriene)chromium(O), -molybdenum(O) and -tungsten(0) was studied at a Pt electrode in aprotic solvents. It was observed that the electrochemical behaviour of these complexes is different in acetonitrile and dichloromethane possibly due to different coordination abilities of the solvent molecules. For the determination of the number of electron transfers at their respective peak potentials, a coulometric method was used. It was found that only one electron transfer occurs at the first oxidation peak of each complex.