Synthesis, characterization, electrochemical behavior and antibacterial/antifungal activities of [Cd(L)X2] complexes with a new Schiff base ligand

A new symmetrical bidentate Schiff base ligand (L) was applied for the synthesis of some new cadmium coordination compounds having the general formula [Cd(L)X-2], in which X is a halide or a pseudo-halide. The ligand and all the cadmium complexes were characterized by elemental analysis, FT-IR, H-1-NMR, C-13-NMR and UV-Vis spectroscopy and by molar conductance measurements. Electrochemical behavior of ligand and Cd(II) complexes were investigated by the cyclic voltammetry method. The morphology and shape of the [Cd(L)Cl-2] particles were depicted by SEM. Antimicrobial properties, such as antibacterial and antifungal activities, of the complexes as compared with ligand were checked against three Gram-negative bacteria: Escherichia coli (ATCC 25922), Pseudomunase aeroginosa (ATCC 9027) and Salmonella Spp. two Gram-positive bacteria: Staphylococcus aureus (ATCC 6538) and Corynebacterium renale and three fungal strains, including Aspergillus niger, Penicillium chrysogenum and Candida albicans. The results revealed appropriate antibacterial and antifungal activities for all compounds, and it was found that coordination of the ligand to Cd(II) lead to an increase in the antimicrobial activities in most of cases.