Microwave-Assisted Synthesis, Characterization, Crystal Structures and Antibacterial Activities of Zinc Complexes Derived from 5–Bromo-2-((cyclohexylimino)methyl)phenol

A dinuclear zinc complex [Zn2L2] (1), and four mononuclear zinc complexes [ZnBr2(LH)2] (2), [ZnCl2(LH)2] (3), [Zn(LH)2(NCS)2] (4) and [ZnI(CH3OH)L] (5), have been prepared from the Schiff base 5-bromo-2-((cyclohexylimino) methyl)phenol (HL) by microwave irradiation method. All the zinc complexes were characterized by CHN elemental analyses, infrared and electronic spectra. Structures of the complexes were further studied by single crystal X-ray determination, which reveals that all the zinc atoms in the complexes are in tetrahedral geometry. The halide and pseudohalide anions are preferred co-ligands in the preparation of such complexes with binary ligands. The biological activity of the complexes on the bacterial strains Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli was evaluated. The complexes bearing halide and pseudohalide ligands show effective activities on the bacteria strains.