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Selective Transport of Alkali‐Metal Cations through Liquid Membranes by Non‐Cyclic Carriers
Author(s) -
Xu Ming,
Song Kai,
Wu LiZhu,
Zhang LiPing,
Tung ChenHo
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020200118
Subject(s) - chemistry , alkali metal , membrane , intramolecular force , naphthalene , selectivity , metal , chromophore , excimer , inorganic chemistry , polymer chemistry , photochemistry , organic chemistry , fluorescence , catalysis , biochemistry , physics , quantum mechanics
The emission spectra of a series of naphthalene end‐labeled oligo‐oxyethylene (N‐P n ‐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‐P n ‐N remarkably, suggesting that the polyether chain of N‐P n ‐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 compounds 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 selectivity.