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Issue 3, 2010
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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

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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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Publication details

The article was received on 16 Sep 2009, accepted on 14 Oct 2009 and first published on 20 Nov 2009


Article type: Paper
DOI: 10.1039/B919247F
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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