Selective Recognition and Extraction of the Uranyl Ion
Selective Recognition and Extraction of the Uranyl Ion
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DOI：
10.1021/ja1035607
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发表时间：
2010-10-06
影响因子：
15
通讯作者：
Rebek, Julius, Jr.
中科院分区：
文献类型：
--
作者：
Sather, Aaron C.;Berryman, Orion B.;Rebek, Julius, Jr.
研制了一种能从水溶液中萃取铀酰离子的三脚架型受体。在400 ppm的铀酰浓度下，所开发的配体将类似于59%的铀酰离子萃取到有机相中。新受体的特点是三个羧酸盐，通过双齿相互作用聚集在铀酰离子上。溶液研究揭示了缓慢交换的羧酸盐的NMR时间尺度。配合物的晶体结构表明，羧酸根与铀酰离子配位，酰胺根与其中一个铀酰氧氧原子形成氢键。配体的疏水涂层及其刚性有助于其从稀水溶液中选择性萃取铀酰离子的能力。
A tripodal receptor capable of extracting uranyl ion from aqueous solutions has been developed. At a uranyl concentration of 400 ppm, the developed ligand extracts similar to 59% of the uranyl ion into the organic phase. The new receptor features three carboxylates that converge on the uranyl ion through bidentate interactions. Solution studies reveal slow exchange of the carboxylates on the NMR time scale. The crystal structure of the complex shows that the carboxylates coordinate to uranyl ion while the amides hydrogen bond to one of the uranyl oxo-oxygen atoms. The hydrophobic coating of the ligand and its rigidity contribute to its ability to selectively extract uranyl ion from dilute aqueous solutions.