Synthesis and characterization of Co(ii)‎, Ni(ii)‎, Cu(ii)‎, Zn(ii)‎ and Cd(ii)‎ complexes with polydentate 14-membered macrocyclic ligand

Abstract EN

The condensation reaction of [2 + 2] semicarbazide with benzoylacetone in a 1:1 molar ratio in aqueous solution at room temperature resulted in the formation of a novel Schiff base tetraimine macrocyclic ligand (L) : 5, 12-dimethyl-7, 14-diphenyl-1, 3, 4, 8, 10, 11-hexaazacyclotetradecane-2, 9-dione.

Macrocyclic complexes of the type, [ML] Cl2 [M = Co (II), Ni (II), Cu (II), Zn (II) or Cd (II)] have been prepared by reacting metal(II) chlorides with the ligand (L) in 1:1 molar ratio in ethanol.

The prepared complexes were characterized by metal content analyses, IR, electronic spectra, magnetic susceptibility and conductivity measurements.

IR spectra confirm coordination of imine nitrogens to the central metal ion.

A square planar geometry has been suggested for all the complexes.

The molar conductance values of the complexes show that they are 1:2 electrolytes.