Structure of test complexes with Schiff base derived ligands: A, NM-3 Tetrakis(2-{(E)-[(2-{[(Z)-(2-hydroxynapthyl)methylidene]amino}phenyl)imino]methyl}phenol)Copper(II). Formula: C28H18CuN2O2, Mol. Wt: 478gms. B, NM-4 Tetrakis (2-{(E)-[(2-{[(Z)-(2-hydroxynapthyl)methylidene]amino}phenyl)imino]methyl}phenol)zinc(II). Formula: C28H18N2O2Zn; Mol. Wt: 480gms.