Effect of structural variations within lipophilic deibenzocrown ether carboxylic acids on the selectivity and efficiency of competitive alkali-metal cation solvent extraction into chloroform

Journal Article · Sat Sep 15 04:00:00 EDT 1990 · Analytical Chemistry (Washington); (United States)

DOI:https://doi.org/10.1021/ac00217a022· OSTI ID:5467901

Walkowiak, W; Charewicz, W A; Kang, Sang Ihn; Yang, Ilwoo; Pugia, M J; Bartsch, R A ^[1]

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1. Texas Tech Univ., Lubbock (USA)

Competitive solvent extraction of alkali-metal cations from aqueous solutions into chloroform by a series of lipophilic dibenzocrown ethers with pendant carboxylic acid groups has been investigated. Both the extraction selectivity and efficiency are influenced by variations of the crown ether ring size and the attachment site of the lipophilic group. Preorganization of the binding site by proper positioning of the lipophilic group enhances extraction selectivity. Very high Na{sup +} extraction selectivity (Na{sup +}/K{sup +} = 32, Na{sup +}/Li{sup +} = 66 and no detectable extraction of Rb{sup +} or Cs{sup +}) was obtained with sym-decyldibenzo-16-crown-5-oxyacetic acid.

• OSTI ID: 5467901
• Journal Information: Analytical Chemistry (Washington); (United States), Journal Name: Analytical Chemistry (Washington); (United States) Vol. 62:18; ISSN 0003-2700; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
DISPERSIONS
EFFICIENCY
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
MIXTURES
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION