Anion exchange of metal complexes. IX. The effect of cross linking

Distribution coefficients for zinc, indium, iridium(III), and iodide tracers between sodium chloride solutions and 2, 4, 8, 10, 16, and 24% cross-linked Dowex-1 quaternary ammonium anion-exchange resins have been obtained. The data, corrected for resin invasion and complex formation in solution, yield parameters for the various resins, independent of the chloride concentration. The dependence of these parameters on the cross linking is much higher for the doubly charged zinc complex in the resin than for the singly charged resin species obtained with indium, iridium(III), and iodide. This dependence is explained on the basis of ion pair formation in the resin, using for the effective dielectric constant quantities calculated from the water contents of the various resins.