Sorption and Desorption of Copper(II) Cations on Ethylenediamine Phosphonic Polyampholytes, According to EPR Data

EPR is used to determine the composition of polymer complexes of divalent copper in macroporous polyampholytes based on styrene-divinylbenzene copolymers containing phosphonic groups −CH2PO(OH)2 and ethylenediamine −CH2NH(CH2)2NH2 (en) groups. It was shown that polymer complexes [Cu(en)2(H2O)2]2+ containing 4 nitrogen atoms (complexes A) form at low degrees of filling. Complexes containing 2 nitrogen atoms [Cu(en)(H2O)4]2+ (complexes B), complexes with phosphonic groups Cu(R-HPO3)2(H2O)4 (complexes C) and aqua complexes $${\text{Cu(}}{{{\text{H}}}_{{\text{2}}}}{\text{O}})_{6}^{{2 + }}$$ (complexes D) are also observed upon further filling. The desorption of copper(II) ions by hydrochloric acid is accompanied by the rapid destruction of copper(II) complexes with ethylenediamine groups and the formation of copper(II) complexes with phosphonic groups and aqua complexes.