A TRLFS study on the complexation of Cm(iii) and Eu(iii) with 4-t-butyl-6,6′-bis-(5,6-diethyl-1,2,4-triazin-3-yl)-2,2′-bipyridine in a water/2-propanol mixture
Sascha TrummForschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021, Karlsruhe, Germany. [email protected]Georg LieserUniversität Karlsruhe, Institut für Anorganische Chemie, Karlsruhe, GermanyM.R.St.J. ForemanIndustrial Materials Recycling, Department of Chemical and Biological Engineering, Chalmers University, Gothenburg, SwedenPetra J. PanakForschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, Karlsruhe, GermanyAndreas GeistForschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, Karlsruhe, GermanyThomas FanghänelEuropean Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe, Germany
2009en
ABI
Аннотация
The complexation of Cm(III) and Eu(III) with 4-t-butyl-6,6'-bis-(5,6-diethyl-1,2,4-triazin-3-yl)-2,2'-bipyridine (t-Bu-C2-BTBP) in water/2-propanol solution is studied. With increasing ligand concentration, 1 : 2 complexes [M(t-Bu-C2-BTBP)(2)(H(2)O)](3+) form from the solvated metal ions. The stability constants are log K(Cm(III)) = 11.1 and log K(Eu(III)) = 9.0. For both Cm(III) and Eu(III), the complexation reaction is both enthalpy and entropy driven. DeltaH(Cm(III)) is 11.7 kJ mol(-1) more negative than DeltaH(Eu(III)), whereas the entropy difference is negligible. This is in good agreement with t-Bu-C2-BTBP's selectivity in liquid-liquid extraction.
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