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.
LIGANDS
MOLECULES
ACTINIDES(III)
LANTHANIDES(III)
EXTRACTING AGENT
SEPARATION
EFFICIENT
SPECTROSCOPY
AMERICIUM(III)
BIPYRIDINES
Author
S. Trumm
Universitat Heidelberg
Karlsruhe Institute of Technology, Campus North
G. Lieser
Karlsruhe Institute of Technology, Campus South
Mark Foreman
Chalmers, Chemical and Biological Engineering, Nuclear Chemistry
P. J. Panak
Universitat Heidelberg
Karlsruhe Institute of Technology, Campus North
A. Geist
Karlsruhe Institute of Technology, Campus North
T. Fanghanel
Universitat Heidelberg
European Commission Joint Research Centre, Institute for Transuranium Elements Karlsruhe
Dalton Transactions
1477-9226 (ISSN) 1477-9234 (eISSN)
Vol. 39 3 923-929Subject Categories (SSIF 2011)
Inorganic Chemistry
DOI
10.1039/b919247f