Synthesis and Characterization of Mn(II), Co(II), Ni(II),Cu(II) and Zn(II) Complexes with Acetylhydrazones

Complexes of Mn(II), Co(II), Ni(II),Cu(II) and Zn(II) with p-tolualdehyde acetyl hydrazone (TAH), p- anisaldehyde acetyl hydrazone (AAH) and 2- furylaldehyde acetyl hydrazone (FAH) of the types [ML2Cl2] where L=TAH and AAH and [M(FAH)2]Cl2 were synthesized. The complexes were characterized on the basis of analytical molar conductance, molecular weight, magnetic moment, infrared and electronic spectra. From the elemental analysis and molecular weight data 1:2 (metal : ligand) was proposed. The molar conductance measurements showed that TAH and AAH complexes were non-electrolytes and FAH complexes were 1:2 electrolytes in DMF and DMSO. The magnetic moment coupled with the electronic spectra suggested an octahedral geometry for all the complexes .
IR spectral studies indicated that TAH and AAH functions as neutral bidentate ligands via carbonyl oxygen and azomethine nitrogen atoms while FAH act as neutral tridentate ligand coordinated through furan ring oxygen atom in addition to carbonyl oxygen and azomethine nitrogen atoms.