Synthesis and characterization of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) complexes of quinoline-8- sulphinic acid

Abstract

Quinoline-8-sulphinic acid (QNSOOH) acts as an ambidentate ligand coordinating through different modes with various transition metal(II) ions. Copper(II) forms a dimer, CU₂(QNSOO)₂CI₂.4H₂O,with sulphinato-N, S at <i>p</i>H1 and a monomer, Cu(QNSOO)₂.2H₂O, with sulphinato-N, O at <i>p</i>H 3. NickeI(II) forms a high spin octahedral sulphinato-N, S complex, while cobaIt(II) forms a low spin octahedral sulphinato-N, S complex. Zinc(II) forms sulphinato-N, O complex and cadmium(II) due to the ‘proximity effect’ forms only sulphinato-O, O complex. All these sulphinato complexes are characterisea with the help of elemental analysis, magnetic moment, conductivity measurement, molecular weight determination, IR and electronic spectra.