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Titolo:
Effect of structural variation within lipophilic lariat ether phosphonic acid monoesters on the selectivity and efficiency of competitive alkali metal cation extraction into chloroform
Autore:
Walkowiak, W; Ndip, G; Bartsch, RA;
Indirizzi:
Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA Texas Tech Univ Lubbock TX USA 79409 hem & Biochem, Lubbock, TX 79409 USA
Titolo Testata:
ANALYTICAL CHEMISTRY
fascicolo: 5, volume: 71, anno: 1999,
pagine: 1021 - 1026
SICI:
0003-2700(19990301)71:5<1021:EOSVWL>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ARMED CROWN-ETHERS; SOLVENT-EXTRACTION; AQUEOUS-SOLUTIONS; CARBOXYLIC-ACIDS; MONOALKYL ESTERS; FUNCTIONAL-GROUP; TRANSPORT; PENDANT; COMPLEX; DIBENZO-14-CROWN-4;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Bartsch, RA Texas Tech Univ, Dept Chem & Biochem, Lubbock, TX 79409 USA Texas Tech Univ Lubbock TX USA 79409 m, Lubbock, TX 79409 USA
Citazione:
W. Walkowiak et al., "Effect of structural variation within lipophilic lariat ether phosphonic acid monoesters on the selectivity and efficiency of competitive alkali metal cation extraction into chloroform", ANALYT CHEM, 71(5), 1999, pp. 1021-1026

Abstract

Lipophilic lariat ether phosphonic acid monoethyl esters with systematic crown ether ring size variation from 12-crown-4 to 24-crown-8 are utilized for competitive alkali metal cation extractions from aqueous solutions into chloroform, Effective alkali metal cation extraction from weakly acidic, neutral, and basic aqueous solutions is achieved, With 4, 5, and 6 oxygens inthe crown ether rings, selectivities for Li+, Na+, and K+, respectively, are observed. An 18-crown-6 phosphonic acid monoester exhibits excellent extraction selectivity for K+ with K+/Li+ and K+/Na+ > 100. The lipophilic group attachment site, as well as the crown ether ring size, is shown to influence the extraction selectivity for the lariat ether phosphonic monoesters.

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Documento generato il 25/11/20 alle ore 04:41:59