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Metal complexation of polymeric amino ligands derived from N , N ′‐methylenebis(acrylamide)‐crosslinked polyacrylamides
Author(s) -
Jose Lissy,
Pillai V. N. Rajasekharan
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970702
Subject(s) - chemistry , acrylamide , metal , polymer chemistry , ligand (biochemistry) , electron paramagnetic resonance , metal ions in aqueous solution , polyacrylamide , thermal stability , inorganic chemistry , polymer , copolymer , organic chemistry , biochemistry , physics , receptor , nuclear magnetic resonance
The N,N ′‐methylenebis(acrylamide) (NNMBA)‐crosslinked polyacrylamide supported amino ligands undergo complexation with Cr(III), Mn(II), Fe(III), Pb(II) and Cd(II) ions. Complexation is maximum for Cr(III) ion. The metal intake decreases as the crosslinking increases. The NNMBA resin can be reused after complexation and desorption without appreciable reduction in amino capacity. The IR spectrum of the Cr(III) complex gives an additional peak for sulfate complexation and the amino peak undergoes a negative shift, which is a clear evidence of metal coordination through the amino nitrogen. EPR, electronic spectra and magnetic moment are indicative of a distorted geometry for Cu(II), Cr(III), Fe(III) and Mn(II) complexes. Cd(II), Pb(II) complexes are diamagnetic. Complexation brings about vivid changes in the surface morphology of polymeric ligand. The thermal stability of Cr(III) complex increases as the metal content increases.