Spectral characterization and antimicrobial activity studies of 5,6-dichloro-1H-benzimidazol-2-yl-(4'/5'/6'-substituted)-phenols (HL1 – HL20) and Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) complexes of HL1
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Abstract
5,6-Dichloro-1H-benzimidazol-2-yl-(4'/5'/6'-substituted)-phenols (HL1 – HL20) and MCl2 complexes (M: Co, Ni, Cu, Zn, Pd) of HL1 were synthesized and characterized by various physico-chemical and spectroscopic methods such as elemental analysis, thermogravimetric analysis, FTIR, NMR and fluorescence spectroscopy. The structures of the complexes were also confirmed by performing molar conductivity and magnetic moment measurements. HL1 acted as a bidentate, monobasic chelating ligand with NO donor sites in all the complexes. It was found that all complexes have non-electrolytic properties and the M:L ratios are 1:1 in the Zn(II) complex and 1:2 in the other complexes. Crystal structure of HL18 was also investigated. The presence of both intra- and inter-molecular hydrogen bonding was observed in both molecules. According to the fluorescence spectral data, the substituents at the 4-position made the fluorescence emission shifted to the lower wavelengths (redshift) compared to HL1, while the substituents at the 3- and 5-positions caused a blueshift effect. The Zn(II) complex showed a greater redshift effect compared to the other complexes. In addition, antimicrobial activity of the compounds was evaluated against six bacteria and three fungi. It was observed that HL1 and its mono substituted derivatives (HL1 – HL11) show selective activity especially against Gram positive bacteria, S. aureus and S. epidermidis. Zn(II) complex showed relatively higher activity against Gram positive bacteria differently from the other complexes.
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Istanbul Üniversitesi-Cerrahpasa
Grant numbers 24777
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