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
Journal article, 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)
Author
S. Trumm
Heidelberg University
Karlsruhe Institute of Technology (KIT)
G. Lieser
Karlsruhe Institute of Technology (KIT)
Mark Foreman
Chalmers, Chemical and Biological Engineering, Nuclear Chemistry
P. J. Panak
Heidelberg University
Karlsruhe Institute of Technology (KIT)
A. Geist
Karlsruhe Institute of Technology (KIT)
T. Fanghanel
European Commission (EC)
Heidelberg University
Dalton Transactions
1477-9226 (ISSN) 1477-9234 (eISSN)
Vol. 39 3 923-929Subject Categories (SSIF 2011)
Inorganic Chemistry
DOI
10.1039/b919247f