Abstract
A new chelating copolymer (8HQ-pvc) was prepared through condensation reaction of 8-hydroxyquinoline -5-sulphonic acid with poly (vinyl chloride) in the presence of pyridine as catalyst. This newly developed resin (8-HQ-pvc) has been used to prepare a series of six polymeric chelates by using Cr(III), Co(II), Ni(II),Cu(II), Cd (II) , Hg(II) and Pb(II) ions. Both the parent chelating resin and its metal chelates have been systematically investigated in detail to elucidate the chemical structure by micro elemental analysis and spectral methods(IR, 1H -13C NMR, and Uv-Vis) spectra, as well as the isometric studies to deduce the average molecular weights of repeated unit in polymeric metal complexes.. In addition to these magnetic susceptibility measurements of the solid metal complexes of PVC-8HQ and the molar conductance of thier solutions in DMSO solutions have been measured to investigate the stereo chemical structures. The chemical structure of metal chelates on the basis of elemental and IR data suggests that the bi dentate (8HQ-pvc) resin coordinate to metal ions through oxygen atom of SO3-H group by replacing H atom and nitrogen of the quinolone ring. Ion exchange properties of the newly resin were studied for Cr3+, Co2+, Ni2+, Cu2+, Pb2+ and Hg2+ ions in aqueous solutions. Batch equilibrium method was employed over wide PH range and interval times and showed that PVC-8HQ resin showed a higher selectivity toward Cr3+, Cu2+ and Cd2+ ions.
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