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The electrochemical behaviour of pentacarbonyl(pyrazine)metal(0) complexes of the group 6 elements was studied by cyclic voltammetry in dichloromethane-(n-Bu) 4 NBF 4  solventelectrolyte couple at -20°C vs. Ag/Ag +  or SCE reference electrode. Constant potential electrolyses of the complexes were carried out at their first oxidation peak potentials and monitored in situ by UV-Vis spectrometry. Electrolysis of W(CO) 5 pz produces [W(CO) 5 pz] +  and a similar electrochemical mechanism is expected both for Cr(CO) 5 pz and Mo(CO) 5 pz complexes. In situ low temperature constant current ESR electrolysis also confirmed the production of [W(CO) 5 pz] +  after the electron transfer.

Spectroelectrochemical Investigation of Pentacarbonyl(pyrazine)metal(0) (Metal = Cr, Mo, W) Complexes of Group 6 Elements