Structural Characterization and Antibacterial, Antifungal, Antioxidant Activity of ONO Salicyl Based Schiff Base and its VO(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Pd(II) and Hg(II) Complexes

Dildora Pardaeva; Aydin Tavman; Erol Erçag; Mayram Hacioglu; Demet Gürbüz; Adem Çinarli; A. Seher Birteksöz Tan

doi:10.17721/fujcV12I1P92-110

Authors

Dildora Pardaeva
Aydin Tavman Istanbul University-Cerrahpasa
Erol Erçag
Mayram Hacioglu
Demet Gürbüz
Adem Çinarli
A. Seher Birteksöz Tan

DOI:

https://doi.org/10.17721/fujcV12I1P92-110

Keywords:

Schiff base, salicyl, metal complexes, antimicrobial, antioxidant

Abstract

An ONO tridentate Schiff base derived from 3,5-dichlorosalicylaldehyde and 2-amino-4-methylphenol (H₂L) and its complexes with VO(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Pd(II) and Hg(II) were synthesized and characterized. The structures of the complexes were confirmed by means of elemental analysis, molar conductivity, magnetic moment, UV-visible, fluorescence, FT-IR and NMR spectroscopy. The M:L ratio is 1:2 in Fe(III) and Co(II) complexes whereas 1:1 in the other complexes. It was observed that the Pd(II) complex is 1:1 ionic while the others are non-ionic according to molar conductivity measurements. H₂L showed weak fluorescence at different wavelengths in neutral, acidic and basic areas and in the form of some metal complexes. The VO(II) and Cu(II) complexes increased the fluorescence effect compared to the ligand, while the Fe(III) complex completely quenched it. Antibacterial and antifungal activity of the compounds was evaluated against six bacteria and three fungi. In general, all the compounds showed moderate antimicrobial activity. It was observed that some of the complexes exhibited higher activity towards S. epidermidis and S. aureus compared to the ligand. Antioxidant activity of the compounds was investigated in terms of 1,1-diphenyl-2-picrylhydrazyl radical (DPPH•) scavenging and Cupric Reducing Antioxidant Capacity (CUPRAC) methods. It was found that Zn(II) and Pd(II) complexes showed higher antioxidant activity than the ligand and the other complexes.

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