Investigation of the Cu2+ and VO2+states in synthetic ion-exchange resins of varying sorts by E.P.R. method

The interaction of Cu²⁺ and VO²⁺ ions with high-molecular ligands of the sulpho, carboxyl, phosphor, amino and aminophosphorus resins were studied by E.P.R. The influence of an active resin group on the formation of the intra complex compounds with metal ions and, hence, on the sorption selectivity has been investigated; the influence of moisture content and temperature on the state of the paramagnetic ions in the resin has been studied. Inhomogeneous distribution of metal ions in the resin matrix which leads to the formation of both individual and exchange-coupled systems has been established. The influence of changes in polymer conformation on the stability of ion-exchange complexes is shown.

The data obtained from the E.P.R. spectra of Cu²⁺ and VO²⁺ complexes in a high polymeric matrix were compared with the corresponding monomeric systems having identical structures for the complex sites.