Coordination chemistry of two new tetraaza Ni(II) and Cu(II) macrocyclic and two new Co(II) and Zn(II) macroacyclic Schiff base complexes containing piperazine moiety: X-ray crystal structures of Ni(II) and Zn(II) complexes

► Synthesis an characterisation of a new tetraaza macrocyclic schiff base ligand containing piperazine moiety. ► Four new macrocyclic and macroacyclic schiff base complexes have been prepared. ► The mechanism of complexes formation have been explained. ► The various spectroscopic methods have been used in order to characterize the products.