PREPARATION AND STRUCTURAL CHARACTERIZATION OF 14-16-MEMBERED PENDENTARM MACROCYCLIC COMPLEXES OF TRANSITION-METAL IONS

Template condensation reaction of ethylenediamine or propylenediamine, formaldehyde and benzidine in 1:2:1 molar ratio in methanol medium re sulted in the formation of a new series of pendent arm hexaazamacrocyc lic complexes of the type [ML(1)Cl(2)] or [ML(2)Cl(2)] (M(II) = Fe-II, Co-II, Ni-II, Cu-II and Zn-II). These polycrystalline compounds are s oluble in DMSO and have been characterized by IR,H-1 NMR, EPR and elec tronic spectral studies, and conductivity and magnetic susceptibility measurements. An octahedral geometry is suggested for all the complexe s, where two coordination sites are occupied by chloride ions and the other four by secondary amines.