Cs+ and Ba2+ selective transport by a novel self-assembled isoguanosine ionophore through polymer inclusion and bulk liquid membranes

Citation
Sc. Lee et al., Cs+ and Ba2+ selective transport by a novel self-assembled isoguanosine ionophore through polymer inclusion and bulk liquid membranes, J INCL P MA, 40(1-2), 2001, pp. 51-57
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
ISSN journal
1388-3127 → ACNP
Volume
40
Issue
1-2
Year of publication
2001
Pages
51 - 57
Database
ISI
SICI code
1388-3127(200106)40:1-2<51:CABSTB>2.0.ZU;2-1
Abstract
5'-(Tert-butyldimethylsilyl)-2',3'-O-isopropylidene isoguanosine (isoG 1) s erves as a selective Cs+ carrier in liquid membrane transport. IsoG 1 is a lipophilic nucleoside that self-assembles via hydrogen bonds and cation-dip ole interactions to form a stable decamer sandwich complex with Cs+. Using an acidic receiving phase, Cs+ transport through polymer inclusion membrane s (PIMs) was observed at concentrations of isoG 1 below 21 mM. When isoG 1 was precomplexed with Cs+ to give the (isoG 1)(10)-Cs+ decamer, flux was ob served above 21 mM carrier. The Cs+ flux increased with increasing carrier concentration of the precomplexed (isoG 1)(1)0-Cs+ decamer. The Cs+ transpo rt selectivity by isoG 1 was investigated in the presence of sodium salt so lutions of high concentration. Excellent Cs+ flux and selectivity over the other alkali metal cations was observed in PIMs and bulk liquid membranes ( BLMs). In the absence of Cs+, this ionophore exhibits good Ba2+ selectivity in BLMs.