Template synthesis and characterization of Cr(III), Fe(III), Mn(II), Co(II), Ni(II), and Cu(II) complexes with polydentate 18-membered macrocyclic ligand

Transition metal complexes of general composition MLCl2 where (M = Mn, Co, Ni, and Cu) and MLCl3 where (M' = Cr and Fe) and L is the ligand formed by the condensation of 2,6-diacetylpyridine and o-phenylenediammine. The compl exes have been characterized on the basis of elemental analyses, molar cond uctance measurements, magnetic susceptibility measurements, IR, electronic and EPR spectral studies. Infrared spectra of the ligand and complexes indi cate that the ligand is hexadentate. All of the complexes are of the high-s pin type. The geometry of the complexes has been deduced by using electroni c and EPR spectral studies and found to have octahedral or tetragonal geome try.