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<p>Copper (II) interaction and ion-exchange kinetics with dimethylamine (PA-1), trimethylamine (PA-2), pyridine (PA-3), phosphonoamine (PA-4), ethylene diamine phosphonic (PA-5, PA-6, PA-7), diethylamine (PA-8) ampholytes and phosphonic acid cationite CMF were investigated. In PA-1, PA-2, PA-3, PA-4, and PA-8, ethylene diamine phosphonic ampholytes (PA-5, PA-6, PA-7) and phosphonic acid cationite CMF Cu(R-HPO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub> (A) and aqua complexes [Cu (H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup>are forming. The ampholyte polymer matrix structure consists of two packaging density segments. In the first place copper, (II) occupy high density region with a low water content where complex structure is Cu(R-HPO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>. The self-diffusion coefficient of Cu<sup>2+</sup> calculated on the basis of EPR spectra analysis is in agreement with self-diffusion coefficient measured by radioactive-tracer technique. In ethylene diamine phosphonic polyampholytes PA-5, PA-6, PA-7 copper (II) forms stable complexes with amino group nitrogen atoms containing 4 (D) or 2 nitrogen atoms (E). In PA-5, PA-7 complexes with 2 and 4 nitrogen atoms and Cu(R-HPO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub> are formed. In PA-6, isotropic line F appeared, which belongs to E complexes where Cu<sup>2+</sup> is exchange coupled to each other. In PA-7, EPR spectra consist of line A, line E and isotropic line G of copper (II) aqua complexes. Such multiversity of copper (II) complexes is due to these polyampholytes’ chemical inhomogeneity. Copper (II) sorption and desorption kinetics depending on outer aqueous solution concentration (CuSO<sub>4</sub> or HCl) and ampholyte grain diameters were investigated. Desorption kinetic curves are approximated by external diffusion and diffusion with moving boundary mechanisms.</p>

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Copper (II) EPR in Amino Phosphonic Polyampholytes

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Vitaly I. Volkov,
  • Irina A. Avilova

摘要

Copper (II) interaction and ion-exchange kinetics with dimethylamine (PA-1), trimethylamine (PA-2), pyridine (PA-3), phosphonoamine (PA-4), ethylene diamine phosphonic (PA-5, PA-6, PA-7), diethylamine (PA-8) ampholytes and phosphonic acid cationite CMF were investigated. In PA-1, PA-2, PA-3, PA-4, and PA-8, ethylene diamine phosphonic ampholytes (PA-5, PA-6, PA-7) and phosphonic acid cationite CMF Cu(R-HPO3)2(H2O)4 (A) and aqua complexes [Cu (H2O)6]2+are forming. The ampholyte polymer matrix structure consists of two packaging density segments. In the first place copper, (II) occupy high density region with a low water content where complex structure is Cu(R-HPO3)2(H2O)4. The self-diffusion coefficient of Cu2+ calculated on the basis of EPR spectra analysis is in agreement with self-diffusion coefficient measured by radioactive-tracer technique. In ethylene diamine phosphonic polyampholytes PA-5, PA-6, PA-7 copper (II) forms stable complexes with amino group nitrogen atoms containing 4 (D) or 2 nitrogen atoms (E). In PA-5, PA-7 complexes with 2 and 4 nitrogen atoms and Cu(R-HPO3)2(H2O)4 are formed. In PA-6, isotropic line F appeared, which belongs to E complexes where Cu2+ is exchange coupled to each other. In PA-7, EPR spectra consist of line A, line E and isotropic line G of copper (II) aqua complexes. Such multiversity of copper (II) complexes is due to these polyampholytes’ chemical inhomogeneity. Copper (II) sorption and desorption kinetics depending on outer aqueous solution concentration (CuSO4 or HCl) and ampholyte grain diameters were investigated. Desorption kinetic curves are approximated by external diffusion and diffusion with moving boundary mechanisms.