CATION-TRANSPORT FROM MULTIPLE ALKALI CATION MIXTURES USING A LIQUID MEMBRANE SYSTEM CONTAINING A SERIES OF CALIXARENE CARRIERS
CATION-TRANSPORT FROM MULTIPLE ALKALI CATION MIXTURES USING A LIQUID MEMBRANE SYSTEM CONTAINING A SERIES OF CALIXARENE CARRIERS
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DOI：
10.1021/ja00287a012
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发表时间：
1985-01-01
影响因子：
15
通讯作者：
IZATT, RM
中科院分区：
文献类型：
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作者：
IZATT, SR;HAWKINS, RT;IZATT, RM
合成了几个新的对叔丁基杯芳烃。这些和其他杯芳烃被用来研究载体介导性碱金属阳离子通量在25度。C在H2O-(有机溶剂)-H2O液膜中。除了单一的阳离子体系外，所有可能的等摩尔、2-、3-和4-阳离子混合物NaOH、KOH、RbOH和CsOH都被用于研究。在每种情况下，碱阳离子的传输都与质子的反向通量耦合。Cs+在Rb+、K+和Na+上的选择性传输被观察到。杯[4]芳烃对Cs+的选择性最大，杯[6]芳烃和杯[8]芳烃对Cs+及其它碱性阳离子的选择性最大。在后一种情况下，较大的通量可能是每个杯芳烃结合2个阳离子的结果。在低[Cs+]/[Rb+]比的实验中，对叔丁基杯[6]芳烃对Rb+的转运优先于Cs+。随着这些比例的增加，Cs+的迁移变得比Rb+更有利，这表明阳离子通量部分取决于阳离子在源相中的相对浓度。[杯芳烃是潜在的酶模拟物。]。
Several new p-tert-pentylcalixarenes synthesized. These and other calixarenes were used to study carrier-mediated alkali-metal cation fluxes at 25.degree. C in H2O-(organic solvent)-H2O liquid membranes. In addition to single cation systems, all possible equimolar, 2-, 3- and 4-cation mixtures of NaOH, KOH, RbOH and CsOH were used in the study. In each case, alkali cation transport was coupled with the reverse flux of protons. Selective transport of Cs+ over Rb+, K+ and Na+ was seen in all mixtures studied. The greatest selectively for Cs+ was found for calix[4]arenes, but the largest flux of Cs+ as well as the other alkali cations was seen with the calix[6]arenes and calix[8]arenes. The greater flux in these latter cases may be a result of each calixarene binding 2 cations. In experiments a low [Cs+]-to-[Rb+]ratios, p-tert-butylcalix[6]arene transports Rb+ over Cs+. As these ratios increase, transport of Cs+ becomes favored over that of Rb+, indicating that the cation flux depends, in part, on the relative concentrations of the cations in the source phase. [Calixarenes are potential enzyme mimics.].