ABSTRACT
Coordination compounds with macromolecular ligands, or polymer-metal complexes (PMC) have found increasing application in catalysis, analytical chemistry, and hydrometallurgy. A study of the structure of PMC has two essential levels. The first involves an analysis of the composition and geometry of the coordination sphere of individual metal complexes. The second which, metal ions are coordinated by the repeating units of a polymer chain. The method of spin exchange titration is based on observation of differences in broadening of the EPR lines of stable radical probes with free and coordinated by a polymer coil paramagnetic metal ions in solutions. The goal of spin exchange titration” (SET) is the quantitative measurement of the complex-forming ability of a macromolecule relative to these ions, and the effects of the PMC structure. Spin exchange between the radical probe and paramagnetic metal ions in the presence of the macromolecular ligand is determined by the chemical nature and composition of the polymer.
