Issue 3, 2010
From the journal:

Dalton Transactions

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†

Sascha Trumm,*ab   Georg Lieser,c   Mark R. S. J. Foreman,d   Petra J. Panak,ab   Andreas Geista  and  Thomas Fanghänelbe  

* Corresponding authors

a Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung, P.O. Box 3640, Karlsruhe, Germany
E-mail: sascha.trumm@ine.fzk.de
Tel: +49 (0)7251-822663

b Ruprecht-Karls Universität Heidelberg, Physikalisch-Chemisches Institut, Heidelberg, Germany

c Universität Karlsruhe, Institut für Anorganische Chemie, Karlsruhe, Germany

d Industrial Materials Recycling, Department of Chemical and Biological Engineering, Chalmers University, Gothenburg, Sweden

e European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe, Germany

Abstract

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 KCm(III) = 11.1 and log KEu(III) = 9.0. For both Cm(III) and Eu(III), the complexation reaction is both enthalpy and entropy driven. ΔHCm(III) is 11.7 kJ mol−1 more negative than ΔHEu(III), whereas the entropy difference is negligible. This is in good agreement with t-Bu-C2-BTBP's selectivity in liquid–liquid extraction.

Graphical abstract: 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

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Article information

DOI
https://doi.org/10.1039/B919247F
Article type
Paper
Submitted
16 Sep 2009
Accepted
14 Oct 2009
First published
20 Nov 2009

Dalton Trans., 2010,39, 923-929

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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

S. Trumm, G. Lieser, M. R. S. J. Foreman, P. J. Panak, A. Geist and T. Fanghänel, Dalton Trans., 2010, 39, 923 DOI: 10.1039/B919247F

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