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Optically active cation-exchangers were newly prepared as Sephadex derivatives derived from L-alanine, L-valine, L-aspartic acid, and L-threonine. They were applied to the column-chromatographic resolution of some cobalt(III) complexes, partial resolution being attained.

In a hexadecyltrimethylammonium bromide solution containing the stable micelle, a solubilized di-t-butyl nitroxide facilitated the partial resolution of the high-field line of the ESR spectrum, which can be associated with the radical in aqueous and micellar phases. Further analysis of the lineshape was made as a function of the surfactant concentration or the temperature.

Partial resolution of neutral [Co(acac)3] was performed by extracting into 1,2-dichloroethane the complex formed when racemic Li[Co(acac)3] was mixed with Δ- or Λ-[Co(phen)3]Cl3 in water. This system is the first Pfeiffer-active system in which a dissymmetric metal complex serves as a chiral environment compound.