Allosteric coextraction of sodium and metal ions with calix[4]arene derivatives 2: first numerical evaluation for the allosteric effect on alkali metal extraction with crossed carboxylic acid type calix[4]arenes.
Allosteric coextraction of sodium and metal ions with calix[4]arene derivatives 2: first numerical evaluation for the allosteric effect on alkali metal extraction with crossed carboxylic acid type calix[4]arenes.
复制标题
用杯[4]芳烃衍生物对钠和金属离子进行变构共萃取2：首次数值评估交叉羧酸型杯[4]芳烃对碱金属萃取的变构效应。
DOI：
10.1016/j.talanta.2011.10.018
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发表时间：
2012
期刊：
影响因子：
6.1
通讯作者：
K. Ohto
中科院分区：
文献类型：
--
作者：
Tomoaki Yoneyama;Hirotoshi Sadamatsu;Shigemasa Kuwata;H. Kawakita;K. Ohto
制备了具有两个较长羧酸和两个远端乙酸的杯[4]芳烃衍生物的交叉羧酸型，研究了在独立体系和竞争体系中对三种碱金属离子的溶剂萃取。这些萃取剂在低pH条件下选择性地从其他碱离子中萃取出钠离子，并且第一个被萃取的钠离子作为“触发器”引起萃取能力和金属选择性的变化。不同长度间隔基团的提取行为有显著差异。为了得到变构效应的数值评价，对目前的环四聚体与被萃取的两个碱金属离子之间的萃取平衡常数kex1和Kex2进行了估算。
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, Kex1and Kex2, 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.