Ni(II) complexes of some polyfunctional n-Naphthylideneamino acids

A new series of amino acid Schiff base Ni(II) complexes of 2-hydroxy- 1 -naphthaldehyde with glycine,l-alanine,l-valine,l-leucine,dl-isoleucine,dl-norleucine,l-serine andl-aspartic acid has been prepared by constituent combination. The structure of the complexes is investigated by microanalysts, conductance, electronic and IR spectral measurements. It is concluded that the bivalent anions of the Schiff bases coordinated to Ni(II) as a tetradentate ligand (ONOO), in the case of the aspartic acid moiety, or as a tridentate ligand (ONO) in the case of the other amino acid moieties. The structure of the Ni(II) complexes is suggested to be square planar.