The transfer of Ni2+, Cd2+ and Fe2+ facilitated by 2,2'bipyridinernand Ni(bipY)32+ complex ion transfer across the membranernstabilized interface between two immiscible electrolyte solutionsrn(water/nitrobenzene) was studied using the floW .. c).nj.e9tionrntechnique, and dc 'i:~d . acc:iycHc vol tanuh~t:ry .t'7J~qff?howrninjection analysis the dependence of peak current height on thernapplied potential all, with the exception of Ni2+, showed an sshapedrnpolarographic wave with fairly sharp i-t curves,rnindicating the reversible or diffusion controlled transfer ofrnthese ions. Ni2+ showed poor current-potential dependence with arnhardly discernible half-wave potential. The i-t curve was veryrnbroad which shows that the transfer of Ni2+ is kineticallyrncontrolled. Similarly the ac cyclic voltammogram of Cd2+, Fe2+ andrnNi (bipy) 3rn2+ shoHed reversible behaviour with overlappingrnand reverse peak potentials and half-peak width of ~45rnforwardrnmv. Inrnthe ac cyclic voltammogram for the transfer of Ni2+ the peakrnpotential for the forward and reverse scans did not overlap,rnindicating kinetically controlled transfer. The reversiblerntransfer of the Ni (bipy) /+ complex was studied by single sweeprnvoltammetry and the diffusion coefficient of the ion in water wasrnevaluated. In the ac voltammetric experiment only the transferrnof the bis and tris complex was within the range of the potentialrnwindow. The transfer of Ni2+ and Fe2+ are presumed to be a complexrnion transfer while that of Cd2+ appears to be a facilitated ionrntransfer of Cd2+ may occur in the bulk phase. The change inrnstandard Gibbs energy of transfer between the successiverncomplexes of Ni 2+ and Fe2+ was about 38.6 KJ/mol while that of Cd2+rnwas very large (53 KJ/mol).