New water soluble phosphonate and polycarboxylate complexants for enhanced f element separations
New water soluble phosphonate and polycarboxylate complexants for enhanced f element separations
复制标题
用于增强 f 元素分离的新型水溶性膦酸盐和聚羧酸盐络合剂
DOI：
10.1007/978-1-4899-1406-4_9
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
J. C. Sullivan
中科院分区：
文献类型：
--
作者：
K. Nash;P. Rickert;E. Lessmann;M. D. Mendoza;Janine F. Feil;J. C. Sullivan
虽然亲脂性萃取剂分子和离子交换聚合物材料对于通过溶剂萃取或离子交换有效分离金属离子显然是必不可少的，但如果不使用水溶性络合剂，通常无法实现最困难的分离。本报告着重介绍了用于强化氟元素分离的膦酸和多羧酸配体的设计、合成和表征方面的最新进展。重点是基本的溶液化学和晶体结构的配合物的f元素与选定的氨基衍生物的甲烷二膦酸和四氢呋喃-2，3，4，5-四羧酸。前一系列化合物在酸性溶液中对镧系元素和锕系元素表现出高亲和力。后一种配体在溶剂萃取过程中对铀酰离子表现出不寻常的（并且非常有用的）“反选择性”，这使得铀酰可以从核废料中更具放射性的成分中有效分离。大多数观察到的效果可以解释通过检查的配体的结构，和各种金属离子络合的光谱和热力学参数的比较。
While lipophilic extractant molecules and ion exchange polymeric materials are clearly essential to efficient separation of metal ions by solvent extraction or ion exchange, the most difficult separations often could not be accomplished without the use of water soluble complexants. This report focuses on recent developments in the design, synthesis and characterization of phosphonic acid and polycarboxylic acid ligands for enhanced f element separations. Emphasis is on the basic solution chemistry and crystal structures of complexes of the f elements with selected amino-derivatives of methanediphosphonic acid and with tetrahydrofuran-2,3,4,5-tetracarboxylic acid. The former series of compounds exhibit high affinity for lanthanides and actinides in acidic solutions. The latter ligand exhibits an unusual (and very useful) “anti-selectivity” for uranyl ion in a solvent extraction process, which permits efficient separation of uranyl from more radioactive components of nuclear wastes. Most of the observed effects can be explained through examination of the structure of the ligand, and comparison of the spectroscopic and thermodynamic parameters for complexation of various metal ions.