Synthesis and Study of an Azo-azomethine Dyes with N,O Donor Set of Atoms and Their Cu (II), Co (II) and Ni(II) Complexes

Abstract

The Synthesis of azo-azomethine ligand H₂L, 2,2'(1,2-phenylenebis(azanylidene)bis (methanylyidene) bis(4-phenyldiazenyl) phenol were carried out by the condensation of phenyl -1,2-diamine with 2-Hydroxy -5-(phenyldiazenyl)benzaldehyde. Reaction of this ligand with Nickel (II), Cobalt (II) and Cooper (II) ions were carried out by using metal chloride salts by the 1:1 molar ratio. Three new organometallic complexes were obtained, the Cu (II), and Ni (II) are tetracoordinate binding to two phenolic oxygens and two imine nitrogen in approximate square planar geometry. Co (II) also coordinates using the same sites like other metals but gave octahedral configuration.The structure of the ligand and its metal complexes were elucidated by elemental analyses, IR, ¹H ¹³C NMR, electronic spectra.

Keywords: Azo-azomethine, tetracoordinate, phenolic, imine.