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Preparation, thermogravimetric analysis and antibacterial study of CD (II) and Sn (II) adducts of mercaptopyridine, aminotriazole derivatives and mercaptothiazoline organic ligands

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Document pages: 10 pages

Abstract: SnCl2. (3amt), H2O, sncl2.2 (3amt), H2O, CdCl2. (3amt), cdcl2.2 (3amt), sncl2.2 (2mct), CdCl2. (2mct), cdcl2.2 (2mct), H2O, sncl2.2 (2mcp), 1.5H2O, > 2.2 (2mcp), 4H2O, cdcl2.2 (2mcp), sncl2.2 (4amt), 4H2O, sncl2.2 (4amt), sncl2.2 (4H2O), sncl2.2 (AMT), 1.5H2O, cdcl2.2 (AMT), cdcl2.4amt, and cdcl2.4amt (among them, 3amt, 4amt, 2mct and 2mcp represent simple organic chelates of 3-amino-1,2,4-triazole, 4-amino-1,2,4-triazole, 2-mercaptothiazoline and 2-mercaptopyridine respectively). In addition, we also studied their thermogravimetric characterization and antibacterial properties. It was confirmed that 3amt and 4amt adducts were coordinated by nitrogen atoms. 2mct adducts were coordinated by nitrogen atomss, the coordination occurs through nitrogen (Sn) or sulfur (Cd). For 2mcp adducts, both coordination sites nitrogen and sulfur are involved. By examination of TG curves, it is confirmed that for each hydrated compounds, the first mass loss step is linked with the release of water molecules followed by the release of ligand molecules and sublimation of the metal chloride. Furthermore, it is verified that, considering only the release of ligand molecules (3amp, 4amp, 2mct, or 2mcp), the cadmium adducts are always more stable than the correspondent tin adducts probably due to the formation of cross-linking bonds in these compounds. Finally, of these 16 adducts, 14 showed antimicrobial activities against different bacterial and fungal strains.

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