Competitive Solvent Extraction of Alkali Metal Cations into Chloroform by Lipophilic Acyclic Proton-Ionizable Polyethers

Wladyslaw Walkowiak; Grace M. Ndip; Dhimant Desai; Han Koo Lee; Richard A. Bartsch

doi:10.1021/ac00039a011

Competitive Solvent Extraction of Alkali Metal Cations into Chloroform by Lipophilic Acyclic Proton-Ionizable Polyethers

Wladyslaw Walkowiak, Grace M. Ndip, Dhimant Desai, Han Koo Lee, Richard A. Bartsch

Research output: Contribution to journal › Article

23 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1685-1690
Number of pages	6
Journal	Analytical Chemistry
Volume	64
Issue number	15
DOIs	https://doi.org/10.1021/ac00039a011
State	Published - Jan 1 1992

All Science Journal Classification (ASJC) codes

Analytical Chemistry

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Walkowiak, W., Ndip, G. M., Desai, D., Lee, H. K., & Bartsch, R. A. (1992). Competitive Solvent Extraction of Alkali Metal Cations into Chloroform by Lipophilic Acyclic Proton-Ionizable Polyethers. Analytical Chemistry, 64(15), 1685-1690. https://doi.org/10.1021/ac00039a011

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abstract = "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.",

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AU - Bartsch, Richard A.

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AB - 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.

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