Influence of the temperature on the solvent extraction of some lanthanide picrates by a posphorylated calix[4]arene

被引：9
|
作者：
Yaftian, MR [1 ]
Vahedpour, M [1 ]
机构：
[1] Zandjan Univ, Dept Chem, Zandjan, Iran
来源：
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS | 2001年 / 174卷
关键词：
calix[4]arene; phosphoryl; rare earths; solvent extraction; thermodynamics;
D O I：
10.1080/10426500108040235
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The extraction of four lanthanide (La, Pr, Nd and Eu) picrates from water into 1,2-dichloroethane using 5,11,17,23 -tetra-tert-butyl-25,26,27,28-tetrakis(diphenylphosphinoylmethoxy)calix[4]arene as extracting agent has been studied. The extraction process takes place via formation of a species having a 1:1:3 metal/ligand/picrate ratio. The investigation of the extraction as a function of temperature between 10-25 degreesC reveals that the distribution ratio of metal ions decreases with increasing temperature. Thermodynamic parameters such as the free energy (DeltaG degrees), enthalpy (DeltaH degrees) and entropy (DeltaS degrees) changes were evaluated from the distribution measurements. The extraction process in all cases is exothermic with positive entropy changes.
引用
收藏
页码：93 / 100
页数：8
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