Chromium(III), manganese(II), cobalt(II), nickel(II), copper(II) and palladium(II) complexes of a 12-membered tetraaza [N4] macrocyclic ligand

Cr-III, Mn-II, Co-II, Ni-II, Cu-II and Pd-II complexes of the macrocyclic ligand, 2,3,5,8, 9,11 hexamethyl-1,4,7,10 tetraazacyclododeca-1,3,7, 9 tetraene (DADAP), have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, i.r., electronic and e.p.r. spectral studies. These spectral studies suggest an octahedral geometry for the Cr-III, Mn-II and Co-II, square planar geometry for Ni-II and Pd-II and tetragonal geometry for Cu-II complexes.