Complexation of NpV Ions with 1,10-Phenanthroline-2,9-dicarboxylic Acid: Spectrophotometric and Microcalorimetric Studies

被引：13

作者：

Yang, Yanqiu ^{[1
,2
]}

Zhang, Zhicheng ^{[2
]}

Luo, Shunzhong ^{[1
]}

Rao, Linfeng ^{[2
]}

机构：

[1] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Sichuan, Peoples R China

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA

来源：

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2014年 / 32期

基金：

中国国家自然科学基金;

关键词：

Actinides; Chelates; N; O ligands; Carboxylate ligands; Coordination modes; DIPICOLINIC ACID; EQUILIBRIUM-CONSTANTS; EXTRACTION PROPERTIES; DIAMIDES; NEPTUNIUM(V); SELECTIVITY; LIGAND; URANIUM(VI); HYDROLYSIS; CHEMISTRY;

D O I：

10.1002/ejic.201402520

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The complexation of Np-V ions with a tetradentate ligand with oxygen and nitrogen donors, 1,10-phenanthroline-2,9-dicarboxylic acid (denoted as H2L), was studied in aqueous solutions by spectrophotometric and calorimetric methods. Np-V ions form a very strong 1:1 complex, NpO2L-, with the stability constant log beta = 11.73 +/- 0.02 in 0.1 M NaClO4 at 25 degrees C. It is a much stronger complex than those of Np-V ions with related ligands such as picolinic acid or dipicolinic acid, as the higher denticity of 1,10-phenanthroline-2,9-dicarboxylic acid results in a larger entropic effect on the complexation. It is expected that the amide derivatives of 1,10-phenanthroline-2,9-dicarboxylic acid would be excellent extractants in the separation of Np-V ions, which are problematic in actinide separation processes owing to their very low extractability by many extractants.

引用

页码：5561 / 5566

页数：6

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