Preparation and structural characterization of 14-16-membered pendent arm macrocyclic complexes of transition metal ions

Article abstract of DOI:10.1016/0277-5387(94)00406-5

Template condensation reaction of ethylenediamine or propylenediamine, formaldehyde and benzidine in 1:2:1 molar ratio in methanol medium resulted in the formation of a new series of pendent arm hexaazamacrocyclic complexes of the type [ML1Cl2] or [ML2Cl2] (M(II)=Fe(II), Co(II), Ni(II), Cu(II) and Zn(II)). These polycrystalline compounds are soluble in DMSO and have been characterized by IR, (1)H NMR, EPR and electronic spectralstudies, and conductivity and magnetic susceptibility measurements. An octahedral geometry is suggested for all the complexes, where two coordi nation sites are occupied by chloride ions and the other four by secondary amines.