Synthesis and characterization of four new azo-Schiff base and their nickel(II) complexes

Abstract

Four new azo-Schiff base ligands were prepared (H2La-H2Ld) via condensation of Methyl-2-{N-(2′-aminoethane)}-amino-1-cyclopentenedithiocarboxylate (Hcden) with derivatives of (E)-2-hydroxy-5-(phenyldiazenyl)benzaldehyde. The corresponding nickel(II) complexes were also synthesized. The structures of the azo-Schiff base ligands and the complexes were characterized by elemental analyses, UV–Vis, IR and 1HNMR spectroscopies. The structures of [NiLa] and [NiLc] complexes have been determined by X-ray crystallography. The Ni(II) metal complexes are formed by the coordination of the N, S and O atoms of the ligands. The X-ray results confirm that the geometry of the Ni(II) metal complexes are slightly distorted square-planar structures. © 2021