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.
MOLECULES
LIGANDS
SEPARATION
AMERICIUM(III)
BIPYRIDINES
LANTHANIDES(III)
EFFICIENT
EXTRACTING AGENT
SPECTROSCOPY
ACTINIDES(III)
Author
S. Trumm
Karlsruhe Institute of Technology (KIT)
Heidelberg University
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
Joint Research Centre (JRC), European Commission
Heidelberg University
Dalton Transactions
1477-9226 (ISSN) 1477-9234 (eISSN)
Vol. 39 3 923-929Subject Categories
Inorganic Chemistry
DOI
10.1039/b919247f