Theoretical and Spectroscopic Studies of SN Donor Thiosemicarbazone Ligand and Its Pt(II) Complex
Abstract
Sulphur-nitrogen (SN) donor thiosemicarbazone ligand [(Z)-N-ethyl-2-(5-methyl-2-oxoindolin-3-ylidene)hydrazinecarbothioamide] and its Pt(II) complex were synthesized by the condensation method. The compounds were structurally characterized by elemental analysis (CHNS), FT-IR, and NMR analysis. The elemental analysis data for the compounds were in good agreement with the theoretical values. The melting point of the complex was higher than the ligand, as expected. The FT-IR spectral data reflect a bidentate bonding of the thiosemicarbazone ligand to the Pt(II) ion through thioketo sulfur and azomethine nitrogen. The docking results (theoretical results) of these compounds show that the binding energy between DNA and the Pt(II) complex was found to be less than that of the Schiff base ligand (L) in the sense that it has higher stability at various stages and angles. The strength of docking between DNA and the Pt(II) complex was also found to be stronger than that of the Schiff base ligand (L).
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References
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