Cr(III), Fe(III), and Co(II) Complexes of Tetraazamacrocycles Derived from 2,3-Butanedione or Benzil and 1,8-Diamino-3,6-diazaoctane

Template condensation of α-diketones such as 2,3-butanedione or benzil with 1,8-diamino-3,6-diazaoctane in the presence of Cr(III), Fe(III) and Co(II) results in the formation of macrocyclic complexes of the type [MLX2]X and [CoLX]X (where M=Cr(III), Fe(III), L=N4 macrocycle and X=NO 3 − or Cl−). The complexes have been characterized by elemental analyses, conductance and magnetic measurements, molecular weight determinations, infrared and diffuse reflectance spectral studies.