Shuttling mechanism of ion transfer at the interface between two immiscible liquids

被引:50
作者
Laforge, Francois O. [1 ]
Sun, Peng [1 ]
Mirkin, Michael V. [1 ]
机构
[1] CUNY Queens Coll, Dept Chem & Biochem, Flushing, NY 11367 USA
关键词
LIQUID/LIQUID INTERFACES; ELECTRON-TRANSFER; POTASSIUM-ION; WATER; DYNAMICS; KINETICS; MEDIA; DIBENZO-18-CROWN-6; TRANSPORT; ITIES;
D O I
10.1021/ja0656090
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The transfers of hydrophilic ions between aqueous and organic phases are ubiquitous in biological and technological systems. These energetically unfavorable processes can be facilitated either by small molecules (ionophores) or by ion-transport proteins. In absence of a facilitating agent, ion-transfer reactions are assumed to be "simple", one-step processes. Our experiments at the nanometer-sized interfaces between water and neat organic solvents showed that the generally accepted one-step mechanism cannot explain important features of transfer processes for a wide class of ions including metal cations, protons, and hydrophilic anions. The proposed new mechanism of ion transfer involves transient interfacial ion paring and shuttling of a hydrophilic ion across the mixed-solvent layer.
引用
收藏
页码:15019 / 15025
页数:7
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