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Titolo:
Metal ion extraction by lariat ethers with 'tunable' proton-ionizable groups
Autore:
Bartsch, RA; Ivy, SN; Lu, JP; Huber, VJ; Talanov, VS; Walkowiak, W; Park, C; Amiri-Eliasi, B;
Indirizzi:
Texas Tech Univ, Dept Biochem & Chem, Lubbock, TX 79409 USA Texas Tech Univ Lubbock TX USA 79409 iochem & Chem, Lubbock, TX 79409 USA Wroclaw Tech Univ, Inst Inorgan Chem & Met Rare Elements, PL-50730 Wroclaw, Wroclaw Tech Univ Wroclaw Poland PL-50730 re Elements, PL-50730 Wroclaw,
Titolo Testata:
PURE AND APPLIED CHEMISTRY
fascicolo: 12, volume: 70, anno: 1998,
pagine: 2393 - 2400
SICI:
0033-4545(199812)70:12<2393:MIEBLE>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
MACROCYCLIC POLYETHERS; DONOR GROUPS; CALIX<4>ARENES; COMPLEXATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Bartsch, RA Texas Tech Univ, Dept Biochem & Chem, Lubbock, TX 79409 USA Texas Tech Univ Lubbock TX USA 79409 m, Lubbock, TX 79409 USA
Citazione:
R.A. Bartsch et al., "Metal ion extraction by lariat ethers with 'tunable' proton-ionizable groups", PUR A CHEM, 70(12), 1998, pp. 2393-2400

Abstract

Compared with crown ethers and lariat ethers with neutral side arms, proton-ionizable lariat ethers have an important advantage for metal ion separations. Due to ion-exchange of the metal ion and a proton from the pendent acidic function, transfer of an aqueous phase anion into the organic medium is avoided. A new type of proton-ionizable group, the N-(X)sulfonyl carbamoyl function, has now been incorporated into lariat ethers. For competitive solvent extraction of alkali metal cations from aqueous solutions into chloroform, variation of the X group is found to change the acidity without concomitant steric effects. A series of N-(X)sulfonyl sym-(decyl)dibenzo-16-crown-5-oxyacetamides exhibits very high Na+ selectivity. The effect of varying the crown ether ring size on alkali metal cation extraction is explored with dibenzo-14-crown-4 and dibenzo-19-crown-6 analogs.

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Documento generato il 25/11/20 alle ore 04:46:00