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
Melissa A. DeneckeForschungszentrum Karlsruhe GmbH, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany, and Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, GermanyAndré RoßbergForschungszentrum Karlsruhe GmbH, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany, and Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, GermanyPetra J. PanakForschungszentrum Karlsruhe GmbH, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany, and Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, GermanyMichael WeiglForschungszentrum Karlsruhe GmbH, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany, and Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, GermanyBernd SchimmelpfennigForschungszentrum Karlsruhe GmbH, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany, and Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, GermanyAndreas GeistForschungszentrum Karlsruhe GmbH, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany, and Forschungszentrum Rossendorf e.V., Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, Germany
2005en
ABI
Аннотация
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 nonaqueous organic solution is studied with extended X-ray absorption spectroscopy. Bond lengths are the same in both complexes. 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 agreement with n-C3H7-BTP's high selectivity for trivalent actinides over lanthanides in liquid-liquid extraction.
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