1123-1125A new series of 13-membered tetraaza macrocyclic complexes has been prepared by the template condensation of triethylenetetraamine with ethyl acetoacetate or methyl acetoacetate in a 1:1 molar ratio. All the complexes are stable in atmosphere and soluble in DMSO and DMF. The complexes have been characterized on the basis of analytical, JR, 1H NMR, EPR, UV-vis, spectra, magnetic susceptibility and conductivity data. An octahedral geometry around the metal ion is suggested for manganese, cobalt, and zinc complexes, while a square-planar geometry is proposed for copper and nickel complexes
