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
Artikel i vetenskaplig tidskrift, 2010
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)(H2O)](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.
MOLECULES
LIGANDS
SEPARATION
AMERICIUM(III)
BIPYRIDINES
LANTHANIDES(III)
EFFICIENT
EXTRACTING AGENT
SPECTROSCOPY
ACTINIDES(III)
Författare
S. Trumm
Karlsruher Institut für Technologie (KIT)
Universität Heidelberg
G. Lieser
Karlsruher Institut für Technologie (KIT)
Mark Foreman
Chalmers, Kemi- och bioteknik, Kärnkemi
P. J. Panak
Universität Heidelberg
Karlsruher Institut für Technologie (KIT)
A. Geist
Karlsruher Institut für Technologie (KIT)
T. Fanghanel
Gemensamma forskningscentrumet (JRC), Europeiska kommissionen
Universität Heidelberg
Dalton Transactions
1477-9226 (ISSN) 1477-9234 (eISSN)
Vol. 39 3 923-929Ämneskategorier
Oorganisk kemi
DOI
10.1039/b919247f