TRANSITION-METAL COMPLEXES OF 20-22-MEMBERED OCTAAZAMACROCYCLES - SYNTHESIS AND CHARACTERIZATION

A series of binuclear octaazamacrocyclic complexes [M(2)L(1)X(4)]-[M(2)L(2)X(4)] (M = Ni-II, Co-II and Zn-II;X = Cl or NO3) and [Cu(2)L(1)]X(4)-[Cu(2)L(2)]X(4) (X = Cl or NO3) have been synthesized by template condensation reaction of aliphatic primary diamines with 3,6-dimethyl-4,5-diazaocta-3,5-diene-2,7-dione in methanol. The overall geometry and stereochemistry of these complexes have been elucidated by IR, H-1 NMR, EPR and electronic spectral studies, and magnetic susceptibility and conductance values. An octahedral geometry around the metal ion is suggested for nickel, cobalt and zinc complexes, whilst a square planar geometry is proposed for copper complexes.