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Titolo:
Cesium complex of an unsymmetrical calix[4]crown-dibenzocrown-6
Autore:
Kim, JS; Lee, WK; Lee, SH; Kim, JG; Suh, IH; Kim, JY; Kim, JW;
Indirizzi:
Konyang Univ, Dept Chem, Nonsan 320711, South Korea Konyang Univ Nonsan South Korea 320711 Chem, Nonsan 320711, South Korea Chungnam Natl Univ, Dept Phys, Taejon 305764, South Korea Chungnam Natl Univ Taejon South Korea 305764 Taejon 305764, South Korea Korea Ginseng & Tobacco Res Inst, Taejon 305345, South Korea Korea Ginseng& Tobacco Res Inst Taejon South Korea 305345 , South Korea Dankook Univ, Dept Clin Pathol, Coll Med, Cheonan 330714, South Korea Dankook Univ Cheonan South Korea 330714 Med, Cheonan 330714, South Korea
Titolo Testata:
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
fascicolo: 3, volume: 40, anno: 2001,
pagine: 183 - 187
SICI:
1388-3127(200107)40:3<183:CCOAUC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
CALIX<4>ARENE DIBENZOCROWN ETHERS; CROWN-ETHERS; LOOPS; RINGS; NA+;
Keywords:
calixarene; calix[4]-bis-crown; complexation; crown ether; crystal structure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, JS Konyang Univ, Dept Chem, Nonsan 320711, South Korea Konyang Univ Nonsan South Korea 320711 onsan 320711, South Korea
Citazione:
J.S. Kim et al., "Cesium complex of an unsymmetrical calix[4]crown-dibenzocrown-6", J INCL P MA, 40(3), 2001, pp. 183-187

Abstract

An unsymmetrical calix[4]-bis-crown ether having both conventional crown-6and dibenzocrown-6 rings in a fixed 1,3-alternate conformation was synthesized with good yield by the reaction of a monocyclic calix[4]crown-6 with dibenzodimesylate in the presence of cesium carbonate. The cesium ion selectivity among alkali metal ions increased compared to symmetrical calix[4]-bis-crown-6. The solid state structure of the ligand-cesium complex illustrates a 1:2 complex ratio. On the contrary, in solution, e.g., extraction equilibrium and H-1 NMR experiment gave a 1:1 complex ratio. From the result ofthe chemical shift change upon metal ion complex, the cesium ion seems to prefer the dibenzocrown loop to the conventional crown-6 ring.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 16:19:55