Synthesis, characterization and thermogravimetric study of Cu(II) adducts with 3- and 4-amino-1,2,4-triazole, 2-mercaptothiazoline and 2-mercaptopyridine

The adducts CuCl 2 ·(3amt), CuCl 2 ·2(3amt)·2H 2 O, CuCl 2 ·3(3amt), CuCl 2 ·(4amt), CuCl 2 ·2(4amt), CuCl 2 ·3(4amt)·2H 2 O, CuCl 2 ·(2mct)·H 2 O, CuCl 2 ·2(2mct)·2.5H 2 O, CuCl 2 ·3(2mct)·2H 2 O, CuCl 2 ·(2mcp) and CuCl 2 ·2(2mcp)·H 2 O, where 3-amino-1,2,4-triazole = 3amt, 4-amino-l,2,4-triazole = 4amt, 2-mercaptothiazoline = 2mct and 2-mercaptopyridine = 2mcp, were synthesized by a solid state route and characterized by CHN elemental analysis and infrared spectroscopy. A thermogravimetric study was also performed. It was verified that 4amp is a molecule with a higher ability to act as a bridging ligand in comparison with 3amp. It was also found that, for all compounds, the mono adducts were the most thermally stable ones. Such a fact is in agreement with a higher ionic and covalent character of the metal-ligand bond in surch compounds.