A series of lipophilic acyclic polyether carboxyllc acids and a corresponding polyether phosphonlc acid monoethyl ester were synthesized In which the unit that contains the lipophilic and the proton-lonlzable groups Is held constant, but the polyether chain and Its terminal group are systematically varied. Competitive solvent extraction of alkali metal cations from aqueous solutions Into chloroform was performed to assess the Influence of structural variation within the extractant molecule upon the extraction selectivity and efficiency. Many of the lonophores exhibited extraction selectivity for Ll+. One of the simplest chelating agents gave an extraction selectivity order of Ll+» Na+K+, Rb+Cs+and a Ll+/Na+selectivity ratio of 4.9, while the selectivity ratios for Ll+over K+, Rb+, and Cs+were 12 or higher.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry