THE REDUCTION OF NICKEL DIMETHYLGLYOXIME COMPLEX PREADSORBED ON MERCURY

The voltammetric reduction of Ni-II(DMGH)(2) complex preadsorbed on me rcury both in 1 M NH4Cl + NH3 buffer and in 0.1 M borate buffer soluti ons was studied. In this work experimental evidence points to Ni-II(DM GH)(2) reduction with simultaneous decomposition of the ligand DMGH(-) and reduction of Ni(II) to Ni(O). The experimental sweep rate depende nce of peak current and potential is explained in terms of a ErCi surf ace reaction scheme and a rate expression that takes into account attr active forces between the adsorbed reactant complex. (C) 1997 Elsevier Science S.A.