Journal
DALTON TRANSACTIONS
Volume 39, Issue 3, Pages 923-929Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b919247f
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Funding
- Commission of the European Community [2007-211267]
- Energie Baden-Wurttemberg (EnBW)
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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. Delta H(Cm(III)) is 11.7 kJ mol(-1) more negative than Delta H(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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