Syntheses, crystal structures, and antimicrobial activities of tetranuclear Ni4 and Ni2Zn2 complexes derived from tetradentate Schiff bases

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Two new homo-tetranuclear nickel(II) complexes, [Ni4(L1)4(CH3OH)4] (1) and [Ni4(L2)4(CH3OH)4] (2), and two new hetero-tetranuclear nickel(II)-zinc(II) complexes, [Ni2Zn2I2(L1)2(μ1,1-N3)2]CH3OH (3) and [Ni2Zn2Cl2(L2)2(μ1,1-N3)2]H2O (4), where L1is the deprotonated form of 4-tert-butyl-2-(3-ethoxy-2-hydroxybenzylideneamino)phenol (HL1) and L2 is the deprotonated form of 4-tert-butyl-2-(2-hydroxy-3-methoxybenzylideneamino)phenol (HL2), have been synthesized. Structures of the complexes were characterized by elemental analysis, IR and UV-Vis spectroscopy, and single crystal X-ray diffraction. The Ni ions in the complexes are in octahedral coordination, and the Zn ions are in distorted square pyramidal coordination. The compounds were evaluated for their antibacterial (Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas fluorescens) and antifungal (Candida albicans and Aspergillus niger) activities by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method.

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