Synthesis and characterization of manganese (II), cobalt (II), nickel (II)copper (II) and zinc (II) complexes of new polydentate, ligands containing1,8-naphthyridine moiety

The substituted 1, 8-naphthyridines, 2-(2-hydroxy-5-methylphenyl)-1, 8-naph thyridine [HMPN] and o-hydroxybenzaldehyde 3-phenyl-1, 8-naphthyridine-2-hy drazone [HBPNh] react with acetates of Mn(II), Co(II), Ni(II), Cu(II) and Z n(II) metal ions to yield complexes of definite composition. The complexes have been characterized by elemental analyses, thermal, conductance, magnet ic studies and IR, electronic, NMR and ESR spectral data. The HMPN and HBPN h form the complexes of formula [M(HMPN)(2)(H2O)(2)] and [M(HBPNh)(2)] resp ectively.