Template synthesis and characterization of N6 12-membered macrocyclic complexes derived from isatin and ethylenediamine

Novel series of complexes of the type [M(TML)X2], where TML is a tetradentate macrocyclic ligand; M = Co(II), Ni(II), Cu(II), Zn(II); X = Cl−, NO 3 − , CH3COO−, have been synthesized by template condensation of isatin and ethylenediamine in the presence of divalent metal salts in a methanolic medium. The complexes have been characterized with the help of elemental analyses, conductance measurements, molecular weight determination, magnetic measurements, NMR, infrared and far infrared spectral studies. The low value of molar conductance indicates them to be nonelectrolytes. All the complexes are supposed to have distorted octahedral geometry.