Synthesis and spectroscopic studies of novel Cu(II), Co(II), Ni(II) and Zn(II) mixed ligand complexes with saccharin and nicotinamide

Four novel mixed ligand complexes of Cu(II), Co(II), Ni(II) and Zn(ll) with saccharin and nicotinamide were synthesised and characterised on the basis of elemental analysis, FT-IR spectroscopic study, W-Vis spectrometric and magnetic susceptibility data. The structure of the Cu (II) complex is compl etely different from those of the Co(II), Ni(ZI) and Zn(II) complexes. From the frequencies of the saccharinato CO and SO2 modes, it has been proven t hat the saccharinato ligands in the structure of the Cu complex are coordin ated to the metal ion ([Cu(NA)(2)(Sac)(2)(H2O)], where NA - nicotinamide, S ac - saccharinato ligand or ion), whilst in the Co(II), Ni(II) and Zn(II) c omplexes are uncoordinated and exist as ions ([M(NA)(2)(H2O)(4)](Sac)(2)). (C) 2001 Elsevier Science B.V. All rights reserved.