SYNTHESIS AND STUDY OF THE COMPOSITION OF A POLYMERMETALLIC COMPLEX BASED ON COPPER(II) CHLORIDE AND POLYETHYLENE GLYCOL

Вased on copper(II) chloride and polyethylene glycol a polymer-metal complex was synthesized, and its composition was established by potentiometric and conductometric methods. The values of the Bierrum’s formation functions were calculated. Titration curves were constructed. The optimal molar ratios of the reacting components were found. The data obtained indicate the formation of polymer complexes of copper, in which two complex mono units of polyethylene glycol account for one metal complexing ion. The coordination saturation of the metal-complexing agent in this complex is due to solvent molecules or the anion of metal salts. The thermodynamic characteristics of the complexation process were calculated: ΔrG0, ΔrН⁰, ΔrS⁰. Negative values of the Gibbs’ energy change indicate the potential possibility for the process under study in the direction of the formation of the polymer-metal complex. A positive value of the change in enthalpy (ΔrН⁰) in the temperature range 298-318K indicates the endothermic nature of the formation of the polycomplex in the indicated range. Changes in entropy values are associated with the destruction of the solvate shells of the PEG’s ligand groups and copper ions, the displacement of solvent molecules and the formation of chelate structures. Using IR spectroscopy, it was confirmed that the oxygen atoms of the polymer ligand are involved in the formation of coordination bonds with the metal complexing ion.

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