Selective Transport of Alkali-Metal Cations through Liquid Membranes by Non-Cyclic Carriers

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2002,（1）
• 页码范围: 90-95
• 页数: 6页
• 语种: 英文

摘要

The emission spectra of a series of naphthalene end- labeled oligo-oxyethylene (N-Pn-N) and their facilitated transport of cations across liquid membranes have been investigated. Alkali-metal cations enhance or inhibit the intramolecular excimer formation of N-Pn-N remarkably, suggesting that the polyether chain of N-Pn-N in solution complexes with the cations, and the orientation of the terminal chromophores depends on the cation size and the length of the polyether chain.These compoumds are able to act as carriers to facilitate transport of alkali- metal cations through organic liquid membranes. The transport efficiencies are comparable with those of cyclic carriers such as crown ethers, and show remarkable seectivity.