Synthesis and charecterisation of Co(II), Ni(II) and Cu(II) complexes of 12-membered macrocyclic ligands.

Complexes of Co(II), Ni(II) and Cu (II) with two 12-membered tetradentate macrocyclic ligands derived from the condensation of diketones with diamines have been prepared. All the complexes have been characterized by elemental analyses, conductance measurements, magnetic moment, infrared, ESR and electronic spectral studies. The complexes were found to have composition MLCl2. On the basis of spectral and magnetic studies octahedral geometry have been assigned for these complexes. These complexes have been screened in vitro for their possible antimicrobial activity.