Tetraphenylethane-1,2-diylbis(phosphoramidate) in conjugation with a room temperature ionic liquid in chloroform medium is reported for the first time in the liquid–liquid extraction of thorium (Th). The extracted Th(IV) is collected as a white solid in the organic medium, thereby facilitating its easy separation. A high distribution ratio (D) of (12.4 ± 0.1) × 10³ in 2–8 mol L^–1 acidity range and high decontamination factors (α) of Th(IV) from uranium, lanthanides, and a number of transition elements makes this extraction process versatile and selective. A number of experimental investigations in synergism with extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DFT) studies are interpreted to confirm the structure of the chelated complex. A 1:2 metal/ligand complex in which the two oxygen and two nitrogen atoms of each bis(phosphoramidate) molecule satisfying the eight coordination sites of Th(IV) is found to be formed. The extracted white solid thorium complex is easily converted to ThO₂ after washing and heating at 1300 °C under O₂ atmosphere. This work is expected to find direct application in the thorium fuel cycle, especially in the mining process of thorium from its ores and in the separation of fissile ²³³U from fertile ²³²Th in irradiated fuel.

中文翻译：

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使用四苯基乙烷-1,2-二基双（氨基磷酸酯）从铀和稀土元素中选择性萃取钍（IV）

首次报道了四苯基乙烷-1,2-二基双（氨基磷酸酯）与室温离子液体在氯仿介质中结合用于钍（Th）的液液萃取。提取的 Th(IV) 在有机介质中以白色固体形式收集，从而有利于其轻松分离。2–8 mol L ^–1中的高分配比 (D) 为 (12.4 ± 0.1) × 10 ³铀、镧系元素和许多过渡元素中的 Th(IV) 的酸度范围和高去污因子 (α) 使得该提取过程具有多功能性和选择性。通过扩展 X 射线吸收精细结构 (EXAFS) 光谱和密度泛函理论 (DFT) 研究的协同作用的许多实验研究被解释为证实了螯合复合物的结构。发现形成了 1:2 金属/配体络合物，其中每个双（氨基磷酸酯）分子的两个氧和两个氮原子满足 Th(IV) 的八个配位位点。_{萃取出的白色固体钍配合物经洗涤并在O 2}下于1300℃加热后很容易转化为ThO ₂气氛。这项工作预计将直接应用于钍燃料循环，特别是从矿石中开采钍的过程以及从辐照燃料中分离可裂变²³³ U 与可转换^{232 Th 的过程。}