17455-21-9Relevant articles and documents
Extraction selectivities of crown ethers for alkali metal cations: Differences between single-species and competitive solvent extractions
Talanova, Galina G.,Elkarim, Nazar S. A.,Hanes Jr., Robert E.,Hwang, Hong-Sik,Rogers, Robin D.,Bartsch, Richard A.
, p. 672 - 677 (1999)
Separation factor values for pairs of alkali metal cations determined in competitive solvent extractions of alkali metal picrates from aqueous solutions into chloroform by a variety of benzo- and cyclohexano-group-containing crown ethers vary significantly from extrapolations based upon the results of single-species extraction experiments. For almost all of the crown ether-alkali metal cation combinations examined, the separation factor values are greater for competitive solvent extraction. In view of the unexpected results for sodium picrate extraction by dibenzo-24-crown-8, the solid-state structure of the isolated complex was determined.