Characterization and Comparison of Cm(III) and Eu(III) Complexed with 2,6-Di(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine Using EXAFS, TRFLS, and Quantum-Chemical Methods

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• 作者：Melissa A. Denecke ; André ; Rossberg ; Petra J. Panak ; Michael Weigl ; Bernd Schimmelpfennig ; and Andreas Geist
• 刊名：Inorganic Chemistry
• 出版年：2005
• 出版时间：November 14, 2005
• 年：2005
• 卷：44
• 期：23
• 页码：8418 - 8425
• 全文大小：263K
• 年卷期：v.44,no.23(November 14, 2005)
• ISSN：1520-510X

文摘

The complexation of Cm(III) and Eu(III) with 2,6-di(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine (n-C₃H₇-BTP) in nonaqueousorganic solution is studied with extended X-ray absorption spectroscopy. Bond lengths are the same in bothcomplexes. Quantum-chemical calculations performed at different levels support this finding. On the other hand,the Cm·(n-C₃H₇-BTP)₃ complex is formed at much lower ligand-to-metal concentration ratio than the Eu·(n-C₃H₇-BTP)₃ complex, as shown by time-resolved laser-induced fluorescence spectroscopy. This is in good agreementwith n-C₃H₇-BTP's high selectivity for trivalent actinides over lanthanides in liquid-liquid extraction.