Several Hg(II) mixed ligand complexes of thiosemicarbazones (2-acetylpyridine-, 4aminoacetophenone-and 2-furaldehyde thiosemicarbazones) with 2-aminothiazole have been prepared. Structural investigations of the complexes have been made based on elemental analyses, spectral (UV-Vis, IR) studies and conductivity measurements. The I.R. spectra indicated the bidentate (neutral) behaviour of the ligands. The thermogravimetry (TG), derivative thermogravimetry (DTG) and differential thermal analyses (DTA) have been used to study the thermal decomposition and kinetic parameters of the complexes using the Coasts-Redfern and Horowitz-Metzger equations.

OH.Complexes from of 5-methyl-3-furaldehydethiosemicarbazone (5M3HFTSC) and Hg(II) salts derived from inorganic (HCl) and organic hallo acids (CHCl 2 COOH or CF 3 COOH) have been prepared. There chemical structures were characterized using elemental analyses, conductivity spectral measurements, thermogravimetric methods and photochemical behaviours. The thermal studies of such complexes using thermogravimetric analysis (TGA), derivatives thermogravimetry (DrTG) from ambient temperature to 750°C showed three decomposition steps. These studies indicated that the thermal decompositions are not simples. The photolysis of the studied compounds has been carried out in the presence of H 2 O 2 . It was found that, the photolysis was enhanced in the presence of H 2 O 2 due to the generation of . OH radicals which are very strong oxidizing agent. Biological activity of theses compounds was tested and screened for their in-vitro antibacterial and antifungal activity. The mixed ligand complexes generally are more active than the binary and free thiosemicarbazne ligand.

Complexes from of 5-methyl-3-furaldehydethiosemicarbazone (5M3HFTSC) and Hg(II) salts derived from inorganic (HCl) and organic hallo acids (CHCl 2 COOH or CF 3 COOH) have been prepared. There chemical structures were characterized using elemental analyses, conductivity spectral measurements, thermogravimetric methods and photochemical behaviours. The thermal studies of such complexes using thermogravimetric analysis (TGA), derivatives thermogravimetry (DrTG) from ambient temperature to 750°C showed three decomposition steps. These studies indicated that the thermal decompositions are not simples. The photolysis of the studied compounds has been carried out in the presence of H 2 O 2. It was found that, the photolysis was enhanced in the presence of H 2 O 2 due to the generation of. OH radicals which are very strong oxidizing agent. Biological activity of theses compounds was tested and screened for their in-vitro antibacterial and antifungal activity. The mixed ligand complexes generally are more active than the binary and free thiosemicarbazne ligand.