SELECTIVE M+-H+ COUPLED TRANSPORT OF CATIONS THROUGH A LIQUID MEMBRANE BY MACROCYCLIC CALIXARENE LIGANDS
SELECTIVE M+-H+ COUPLED TRANSPORT OF CATIONS THROUGH A LIQUID MEMBRANE BY MACROCYCLIC CALIXARENE LIGANDS
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DOI：
10.1021/ja00345a016
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发表时间：
1983-01-01
影响因子：
15
通讯作者：
CHRISTENSEN, JJ
中科院分区：
文献类型：
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作者：
IZATT, RM;LAMB, JD;CHRISTENSEN, JJ
研究了大环对叔丁基杯[4]芳烃、对叔丁基杯[6]芳烃和对叔丁基杯[8]芳烃作为阳离子载体在水-有机溶剂-水液膜中的作用。当源水相是金属硝酸盐的溶液时，没有观察到通过膜（CHC 13）的阳离子运输与这些配体形成对比，当存在大环载体18-冠-6时可测量的运输。然而，如果源相伊萨金属氢氧化物的溶液，则在膜（25%v/v CH 2Cl 2-CC 14）中用杯芳烃观察到阳离子的迁移，而用18-冠-6观察不到。对叔戊基杯[4]芳烃和对叔丁基杯[8]芳烃的初步研究表明，杯[8]芳烃对Cs+的迁移行为与相应的对叔丁基杯[4]芳烃相似。这些杯芳烃配体提供了膜载体所需的几个特征：（1）低水溶性，（2）通过质子的损失与阳离子形成中性络合物，和（3）将阳离子运输与质子的反向通量偶联的潜力。
Macrocyclic p-íerZ-butylcalix [4] arene,-calix [6] arene, and-calix [8] arene have been studied as cation carriers in H20-(organic solvent)-H20 liquid membranes. When the source water phase is a solution of the metal nitrate salt, no cation transport through the membrane (CHC13) is observed with these ligandsin contrast to measurable transport when the macrocyclic carrier, 18-crown-6, is present. However, if the source phase isa solution of the metal hydroxide, transport of cations is observed with calixarenes but not with 18-crown-6 in the membrane (25% v/v CH2C12-CC14). Transport by the calixarenes is selective for Cs+ over other alkali metal cations with the selectivity increasing in the order [8]<[6]<[4], Preliminary work with p-tert-pentylcalix [4] arene and-calix [8] arene shows transport behaviorto be similar to that of the corresponding p-tert-bu-tylcalixarenes. These calixarene ligands offer several features desirable to membrane carriers:(1) low water solubility,(2) formation of neutral complexes with cations through loss of a proton, and (3) the potential for coupling cation transport to the reverse flux of protons.