Co(II), Ni(II) and Cu(II) Complexes of Asymmetric Aldazines: Synthesis, Characterization and Antimicrobial Studies

Co(II), Ni(II) and Cu(II) complexes have been synthesized with asymmetric aldazines (LI and LII) derived from benzophenone hydrazone and substituted salicylaldehyde. The structure of the complexes has been proposed in the light of elemental analyses, IR, UV-Vis., and magnetic studies. These complexes are soluble in DMF and DMSO. The measured low molar conductance values in nitrobenzene indicate that, the complexes are non-electrolytes. The elemental analyses of the complexes confine to the stoichiometry of the type ML2.2H2O [M=Co(II), Ni(II) and Cu(II)]. From spectroscopic studies it has been concluded that the coordination occurs through aldazene nitrogen, phenolic oxygen of salicylaldehyde via deprotonation. The aldazines and their complexes have been screened for their antibacterial (Pseudomonas aeruginosa and Klebsiella) and antifungal (Aspergillus niger and Aspergillus flavus) activities.