Calix[6]arene-Picolinamide Extractants for Radioactive Waste Treatment: Effect of Additional Carboxy Binding Sites in the Pyridine 6-Positions on Complexation, Extraction Efficiency and An/Ln Separation
作者:Elena Macerata、Francesco Sansone、Laura Baldini、Franco Ugozzoli、Frederic Brisach、Jaouad Haddaoui、Véronique Hubscher-Bruder、Françoise Arnaud-Neu、Mario Mariani、Rocco Ungaro、Alessandro Casnati
DOI:10.1002/ejoc.200901479
日期:2010.5
of the pyridine nuclei of calixarene-based picolinamide ligands on the extraction and complexation properties of lanthanide(III) and actinide(III) metal ions was studied. For this purpose, six new ligands 1–6 were synthesized; their conformational properties were studied both in solution and in the solid state, and their binding properties towards lanthanide (LnIII) and actinide (AnIII) metal ions were
研究了在基于杯芳烃的吡啶酰胺配体的吡啶核的 6 位存在额外的酯或酰胺羧基对镧系元素 (III) 和锕系 (III) 金属离子的萃取和络合性能的影响。为此,合成了六个新的配体 1-6;在溶液和固态下研究了它们的构象特性,并在模拟放射性废物中存在的萃取条件下测定了它们对镧系元素 (LnIII) 和锕系元素 (AnIII) 金属离子的结合特性。在 BrCosan 作为增效剂的情况下,即使在 [HNO3] > 2–3 M 下,也观察到这些配体提取三价金属离子的效率相当高。还在均相条件下(甲醇溶液)研究了 LnIII 金属离子的络合, 在氯化物和硝酸盐介质中,通过使用分光光度法和量热法。与用配体 L1-L3 获得的数据进行比较,在吡啶核的 6 位缺少额外的结合位点,报告了配体结构对配合物化学计量、金属离子配位的影响,还讨论了吡啶结合基团的碱性以及提取中的效率和选择性。