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Example of two novel thiocyanato bridged copper (II) complexes derived from substituted thiosemicarbazone ligand: Structural elucidation, DNA/albumin binding, biological profile analysis and molecular docking study.
Journal of Biomolecular Structure & Dynamics 2018 August 14
Two novel copper (II) substituted thiosemicarbazone Schiff base complexes [Cu(L1 )(µ-SCN)]n (NO3 )2 (1) and [Cu2 (µ-SCN)(SCN)(L2 )2 ](NO3 ) (2) have been synthesized by condensing substituted thiosemicarbazides like 4-methyl-3-thiosemicarbazide or 4-ethyl-3-thiosemicarbazide with 2-acetylpyridine. Both the metal complexes 1 and 2 are characterized by different spectroscopic techniques like IR, UV-Vis, ESR spectroscopy followed by elemental analysis, cyclic voltammetric measurement and single crystal X-ray structure analysis. X-ray crystal structures of complex 1 and 2 reveal that complex 1 is polymeric while complex 2 is dimeric in nature. The coordination geometry around Cu(II) are square pyramidal in which thiosemicarbazone Schiff base ligand coordinate to the central Cu(II) atom in tridentate fashion. The prominent interaction patterns of 1 and 2 with CT-DNA were examined by employing electronic absorption and emission spectral titrations, cyclic voltammetry and viscosity measurements. All the results show that CT-DNA binds with both copper (II) complexes 1 and 2. Further, protein binding ability in vitro of complexes 1 and 2 with both BSA and HSA were carried out by multispectroscopic techniques and a static quenching pattern was observed in both cases. Molecular docking study was employed to ascertain the exact mechanism of action of 1 and 2 with DNA and protein molecules (BSA and HSA). In vitro cytotoxicity activity of complexes 1 and 2 towards AGS and A549 was evaluated by MTT assay which demonstrates that both complexes 1 and 2 have superior prospectus to act as anticancer agents.
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