COMPLEXING ABILITY OF SOME 2-SPIROTHIAZOLID-4-ONE DERIVATIVES

The complexes of some 2-spirothiazolid-4-one derivatives have been pre pared with Cu(II), Ni(lI), Co(II) and Cd(II) salts. The complexes all have a metal to ligand ratios of 1:1 or 1:2 and are all believed to ha ve tetrahedral structures with chelating ligands. Their structures are suggested on the basis of analysis, X-ray diffraction techniques, spe ctral (UV-VIS, IR, H-1 NMR), and thermal decomposition as well as cond uctivity measurements. The ligands are coordinated to the metal ions a s monovalent bidentate Ligands through the OCO groups. Electrical cond uctivity studies indicated that these complexes have activation energi es in the range of semi-conducting materials. It is observed that some of the complexes are more potent as bacteriostatic agents than the fr ee ligands.