Synthesis and characterization of a new macrocyclic ligand and its cobalt(II), copper(II) and zinc(II) complexes

The synthesis of a new ligand, N4 Tetra (Methyl Azomethine)-Diethylene Hydrazide (TMADEH), was carried out through the condensation of 1,2-diacetylhydrazine with ethylenediamine. The metal complexes of TMADEH were prepared by reacting ligand with Co²⁺, Cu²⁺ and Zn²⁺. The structures of the ligand and its complexes were confirmed using various techniques including FT-IR, UV-VIS, ¹H-NMR, ¹³C-NMR, elemental analysis, electrical conductivity and atomic absorption spectroscopy. It was found the ligand acts as a tetra-aza ligand and the metal complexes have the formulas [Co (TMADEH)Cl2], [Cu (TMADEH)(H2O)2]Cl2 , [Cu (TMADEH)(H2O)2]Cl2 with metal ratio (1:1) and octahedral structures.