On the Metal Ion Selectivity of Oxoacid Extractants

被引：3
|
作者：
Hay, Benjamin P. [1 ]
Chagnes, Alexandre [2 ,3 ]
Cote, Gerard [2 ,3 ]
机构：
[1] Oak Ridge Natl Lab, Div Chem Sci, Chem Separat Grp, Oak Ridge, TN 37831 USA
[2] Chim ParisTech, LECIME, Paris, France
[3] CNRS, Paris, France
来源：
SOLVENT EXTRACTION AND ION EXCHANGE | 2013年 / 31卷 / 01期
关键词：
Liquid-liquid extraction; cation exchange; ligand basicity; metal ion acidity; LFER; COMPLEXATION; STABILITY; HYDROLYSIS;
D O I：
10.1080/07366299.2012.709452
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Relationships between metal chelate stability, ligand basicity, and metal ion acidity are reviewed and the general applicability is illustrated by linear correlations between aqueous stability constants and ligand pKa values for 35 metals with 26 ligands. The results confirm that most individual ligands of this type exhibit a stability ordering that correlates with the Lewis acidity of the metal ion. It is concluded that the general metal ion selectivity exhibited by liquid-liquid oxoacid extractants such as carboxylic acids, beta-diketones, and organophosphorus acids reflects the intrinsic affinity of the metal ion for the negative oxygen donor ligand.
引用
收藏
页码：95 / 105
页数：11
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