1977) Investigation of the Cu 2+ and VO 2+ states in synthetic ion-exchange resins of varying sorts by E.P.R.The interaction of Cu 2+ and VO ~+ ions with high-molecular ligands of the sulpho, carhoxyl, 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 Cu 2+ and VO 2+ complexes in a high polymeric matrix were compared with the corresponding monomeric systems having identical structures for the complex sites.
The processes of the electron paramagnetic relaxation, molecular motions and structural changes in aqueous solutions of manganese nitrate have been investigated by direct measurement of spin-lattice (T1) and spin-spin (T2) relaxation times for a wide range of concentrations, temperatures and viscosities. T1 and Tz were measured by a non-resonance absorption method.It was discovered that some structural regions exist at the different concentrations of Mn(II) ions in solution. So, the structure of highly concentrated solutions may be considered as one of the corresponding crystallohydrate. The structural microinhomogeneities were observed also in the intermediate concentration range at definite temperatures. It is shown that the relaxation mechanism proposed by Bloembergen and Morgan is not effective in the concentration range studied by us.The analysis of relaxation times and E.P.R. spectra has shown the formation of' liquid microphases ' at the freezing point of the solution. Such microphases can exist at temperatures a few tenths of a degree below the solvent freezing point, and its composition considerably differs from the initial solution.The correlation times for intramolecular and intermolecular electron relaxation mechanisms are evaluated and their nature is discussed.
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