Qualitative composition determination of macromolecular complexes of Cu(II), Zn(II), Co(II), Mn(II) ions with copolymer of acrylamide and sodium acrylate

Abstract

The composition of macromolecular complexes formed at a room temperature by mixing aqueous solutions of acrylamide and sodium acrylate copolymer, which was obtained by alkaline hydrolysis of polyacrylonitrile fiber, with Cu(II), Zn(II), Co(II), and Mn(II) sulfates have been shown to depend upon the molar ratio of the copolymer carboxylate group and the metal ion in the solution. The type of the complexes formed between the metal ions studied with the copolymer carboxylate group has been identified by the Fourier-IR spectroscopy. Сonditions have been found of preferable formation of bidentate and/or monodentate complexes as well as bridging (or pseudo-bridging) bonds. The possibility of nitrogen atoms of the amide group participation in the formation of a coordination bond with Cu(II) ions has been shown. Changing hydration degree of the amide group of the copolymer has been suggested to take place during the formation of bidentate insoluble hydrophobic complexes between metal ion and the copolymer carboxylate group (at molar ratios of COO– – Me(II) of 1 : 1 and 2 : 1).

Keywords

• macromolecular metal complexes
• copolymer of acrylamide with sodium acrylate
• cu(ii); zn(ii); mn(ii); co(ii) ions