Lower-rim polyphosphorylated calix[4]arenes. Their use as extracting agents for thorium (IV) and europium (III) ions

被引：13
|
作者：
Yaftian, MR
Taheri, R
Matt, D
机构：
[1] Zanjan Univ, Dept Chem, Zanjan, Iran
[2] Univ Strasbourg, Strasbourg, France
来源：
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS | 2003年 / 178卷 / 06期
关键词：
calix[4]arene; europium; phosphine oxide; solvent extraction; thorium;
D O I：
10.1080/10426500307897
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The extraction of thorium (IV) and europium (III) ions from aqueous nitrate media (1 M nitric acid and sodium nitrate) using six p-tert-butylcalix[4]arene derivatives bearing phosphine oxide units (-CH2P(0)Ph-2) anchored at the lower rim has been investigated at 25degreesC. All ligands display higher extracting properties toward thorium than europium ions. The number and position on the lower rim of the ligating groups play a crucial role in the extraction process, the highest extraction percentages being in each case achieved with the tetra-phosphorylated calixarene. In the presence of sodium nitrate the extraction percentages are considerably higher than those obtained in the presence of nitric acid.
引用
收藏
页码：1225 / 1230
页数：6
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