Cs+ and Ba2+ selective transport by a novel self-assembled isoguanosine ionophore through polymer inclusion and bulk liquid membranes
Cs+ and Ba2+ selective transport by a novel self-assembled isoguanosine ionophore through polymer inclusion and bulk liquid membranes
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DOI：
10.1023/a:1011120723100
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发表时间：
2001-06-01
影响因子：
2.3
通讯作者：
Davis, JT
中科院分区：
文献类型：
--
作者：
Lee, SC;Lamb, JD;Davis, JT
5'-(Tert-butyldimethylsilyl)-2',3'-O-isopropylidene isoguanosine (isoG 1) serves as a selective Cs+ carrier in liquid membrane transport. IsoG 1 is a lipophilic nucleoside that self-assembles via hydrogen bonds and cation-dipole interactions to form a stable decamer sandwich complex with Cs+. Using an acidic receiving phase, Cs+ transport through polymer inclusion membranes (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 observed above 21 mM carrier. The Cs+ flux increased with increasing carrier concentration of the precomplexed (isoG 1)(1)0-Cs+ decamer. The Cs+ transport selectivity by isoG 1 was investigated in the presence of sodium salt solutions 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.
