METAL COMPLEXATION OF POLYMERIC AMINO LIGANDS DERIVED FROM N,N'-METHYLENEBIS(ACRYLAMIDE)-CROSS-LINKED POLYACRYLAMIDES

The N,N'-methylenebis(acrylamide) (NNMBA)-crosslinked polyacrylamide s upported amino ligands undergo complexation with Cr(III), Mn(II), Fe(I II), Pb(II) and Cd(II) ions. Complexation is maximum for Cr(III) ion. The metal intake decreases as the crosslinking increases. The NNMBA re sin can be reused after complexation and desorption without appreciabl e reduction in amino capacity. The IR spectrum of the Cr(III) complex gives an additional peak for sulfate complexation and the amino peak u ndergoes a negative shift, which is a dear evidence of metal coordinat ion through the amino nitrogen. EPR, electronic spectra and magnetic m oment are indicative of a distorted geometry for Cu(II), Cr(III), Fe(I II) and Mn(II) complexes. Cd(II), Pb(II) complexes are diamagnetic. Co mplexation brings about vivid changes in the surface morphology of pol ymeric ligand. The thermal stability of Cr(III) complex increases as t he metal content increases.