Synthesis and characterization of transition metal complexes containing oxime, amido and thioamido groups

New transition metal complexes of alpha-oximinoaceto-o-anisidide-4-phenylthiosemicarbazone (H(3)OAAT) have been prepared and their geometries are assigned. All the investigated complexes are mononuclear except the Cu(II) ions which form binuclear complexes with the chloride and acetate salts. The ligand acts as binegative tridentate in the Co(II), Ni(II), Zn(II) and Pd(II) complexes, trinegative tridentate in the Fe(III) and Co(III) complexes and trinegative pentadentate manner in the Cu(II) complexes. The Cu(II) and Pd(II) complexes possess a square-planar stereochemistry while Ni(II) complex has an octahedral structure. Co(II) salts form diamagnetic and paramagnetic complexes. The protonation constants of the ligand and the stability constants of its Co(II), Ni(II) and Cu(II) complexes are calculated pH-metrically. Moreover, H(3)OAAT has been applied for the determination of Ni(II), Co(II), Cu(II) and Pd(II) ions in the 0.1-3.5 ppm range.