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.
SPECTROSCOPY
EXTRACTING AGENT
EFFICIENT
SEPARATION
LIGANDS
MOLECULES
LANTHANIDES(III)
BIPYRIDINES
ACTINIDES(III)
AMERICIUM(III)
Författare
S. Trumm
Universität Heidelberg
Karlsruher Institut für Technologie (KIT)
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
Europeiska kommissionen (EU)
Universität Heidelberg
Dalton Transactions
1477-9226 (ISSN) 1477-9234 (eISSN)
Vol. 39 3 923-929Ämneskategorier (SSIF 2011)
Oorganisk kemi
DOI
10.1039/b919247f