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Synthesis, Structure and Biological Activity of Indole-Imidazole Complexes with ZnCl 2 : Can Coordination Enhance the Functionality of Bioactive Ligands?
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Synthesis, Structure and Biological Activity of Indole-Imidazole Complexes with ZnCl 2 : Can Coordination Enhance the Functionality of Bioactive Ligands?
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Journal Article
Synthesis, Structure and Biological Activity of Indole-Imidazole Complexes with ZnCl 2 : Can Coordination Enhance the Functionality of Bioactive Ligands?
2023
Overview
The ability of the indole-imidazole hybrid ligands to coordinate with the Zn(II) ion and the resulting structures of this new class of coordination compounds were analyzed in order to determine their structural properties and biological functionalities. For this purpose, six novel Zn(II) complexes, [Zn(InIm)
Cl
] (
), [Zn(InMeIm)
Cl
] (
), [Zn(IniPrIm)
Cl
] (
), [Zn(InEtMeIm)
Cl
] (
), [Zn(InPhIm)
Cl
] (
) and [Zn
(InBzIm)
Cl
] (
) (where InIm is 3-((1H-imidazol-1-yl)methyl)-1H-indole), were synthesized by the reactions of ZnCl
and the corresponding ligand in a 1:2 molar ratio in methanol solvent at an ambient temperature. The structural and spectral characterization of these complexes was performed using NMR, FT-IR and ESI-MS spectrometry and elemental analysis, and the crystal structures of
-
were determined using single-crystal X-ray diffraction. Complexes
-
form polar supramolecular aggregates by utilizing, for this purpose, the N-H(indole)∙∙∙Cl(chloride) intermolecular hydrogen bonds. The assemblies thus formed differ depending on the distinctive molecular shape, which can be either compact or extended. All complexes were screened for their hemolytic, cytoprotective, antifungal, and antibacterial activities. The results show that the cytoprotective activity of the indole/imidazole ligand significantly increases upon its complexation with ZnCl
up to a value comparable with the standard antioxidant Trolox, while the response of its substituted analogues is diverse and less pronounced.
