Studies of Ni(II) and Cu(II) complexes with schiff base derived from salicylaldehyde and aniline

Abstract

The schiff base ligand and its complexes of divalent metal ions of Ni (II) and Cu (II) were synthesized. The ligand and the complexes were characterized by elemental analysis, potentiometry, molar conductance, melting point or decomposition temperatures and infrared analyses. The elemental analysis data show the formation of 1:2 metal-ligand ratio. The ligand and complexes were screened for antibacterial activity against Escherichia coli and Staphylococcus aureus, and antifungal activity against Aspergillums niger and Candida albican, using discs diffusion method. It has been found that the ligand and the complexes showed different activities against microorganisms. The complexes show higher activity than the free Schiff base ligand. The molar conductance of the complexes measured is low, indicating their non-electrolytic nature. The potentiometric studies of the complex compounds revealed 1:2 metal to ligand ratio.

Keywords: salicylaldehyde, aniline, ligand, potentiometry, antibacterial, antifungal