The Polarography of N,N′-Ethylenebis(acetylacetoniminato) and N,N′-Ethylene bis(salicylaldehydeiminato) Complexes of Cobalt(III), Nickel(II), and Copper(II) in an N,N′-Dimethylformamide Solution

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Abstract
The polarographic behavior of N,N′-ethylenebis(acetylacetoniminato) (baen) and N,N′-ethylenebis(salicylaldehydeiminato) (bisaen) complexes of cobalt(III), nickel(II), and copper(II) in DMF solutions was studied thoroughly. At the dropping mercury electrode, these metal complexes give well-defined cathodic waves corresponding to the reduction of metal(II) to metal(I). A careful and systematic study of the polarographic behavior of β-cis and trans cobalt(III)-baen and -bisaen complexes of the general formulae: CoZY1−a and CoZX21−2b, and that of nickel(II)- and copper(II)-baen complexes, revealed that the unusual stability of the metal(I)-baen and -bisaen complexes can be ascribed mainly to the stable square-planar nature of baen and bisaen. The effect of the replacement of the ligand by the halogen atom was also investigated.