Synthesis and characterization of macrocyclic quadridentate schiff base ligands and their copper(II), nickel (II) and zinc (II) complexes

Abstract

Macrocyclic quadridentate organic schiff base ligands (22-membered) have been synthesized and their macrocyclic complexes of Cu(II), Ni(II) and Zn(II) are isolated. The complexes have been characterized by elemental analysis, magnetic measurements, X-ray diffraction, reflectance and IR spectral studies. The X-ray diffraction studies show the number of molecules per unit cell n =6, which is same for both macrocyclic ligands and their complexes indicating that metal atom is inside the macrocyclic structure and coordinated by N₂N₂ sites which is supported by IR spectral data. The magnetic measurements show tetrahedral structure of the complexes.