期刊
TALANTA
卷 88, 期 -, 页码 121-128出版社
ELSEVIER
DOI: 10.1016/j.talanta.2011.10.018
关键词
Calix[4]arene carboxylic acid; Alkali metal ions; Extraction equilibrium constants; Allosteric effect; Chemical shift
Crossed carboxylic acid types of calix[4]arene derivatives with two longer carboxylic acids and two acetic acids at the distal position have been prepared to investigate the solvent extraction of three alkali metal ions in individual and competitive systems. These extractants selectively extracted sodium ions among other alkali ions at low pH, and the first extracted sodium ion acted as a trigger causing a change in extraction ability and metal selectivity. Spacer groups with different lengths induced significant differences in the extraction behavior. The extraction equilibrium constants. K-ex1 and K-ex2, between the present cyclic tetramers and the extracted two alkali metal ions were estimated in order to obtain a numerical evaluation of the allosteric effect. (C) 2011 Elsevier B.V. All rights reserved.
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