The tetrameric complexes of Co(II),Ni(II),cu(II),Zn(II),Cd(II) and Hg(II) with two new symmetrical OON-NOO donor hexadentate azodye ligands, 1,3-bis(2’-hydroxy-3’-formyl-5’-bromophenylazo)benzene and 4,4’-bis(2’- hydroxy-3’-formyl-5’-lazo)diphenylsulphone have been synthesized and characterized by elemental analysis, conductance measurement, magnetic, IR, electronic spectra, ESR, NMR, Thermo gravimetric, XRD(powdered pattern) and molecular modeling studies. The antibacterial study of the ligands and some of the complexes has been made against gram positive bacteria S.aureus and gram negative bacteria E.coli, and this study indicates that some complexes are more potent bactericides than the ligands. The Co(II), Ni(II) complexes are found to be octahedral, Cu(II) complexes distorted octahedral and a tetrahedral stereochemistry has been assigned to Zn(II), Cd(II) and Hg(II) complexes. All the complexes are found to be thermally stable. A triclinic crystal system for Cu(II)complex with the former ligand and orthorhombic crystal system is suggested for the Co(II) complex with the latter ligand. Crystallite size of the complexes were found to be 0.305 nm for Cu(II) complex with LH2 and 0.862 nm for Co(II) complex with L’H2.