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; Georg Lieser; Mark R. S. J. Foreman; Petra J. Panak; Andreas Geist; Thomas Fanghänel

doi:10.1039/B919247F

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Dalton Transactions

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

Sascha Trumm , Georg Lieser , Mark R. S. J. Foreman , Petra J. Panak , Andreas Geist and Thomas Fanghänel

Dalton Trans., 2010, 39, 923-929

DOI: 10.1039/B919247F
Received 16 Sep 2009, Accepted 14 Oct 2009
First published on the web 20 Nov 2009

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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. ΔH_Cm(III) is 11.7 kJ mol⁻¹ more negative than ΔH_Eu_(III), whereas the entropy difference is negligible. This is in good agreement with t-Bu-C2-BTBP's selectivity in liquid–liquid extraction.

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Sascha Trumm
Georg Lieser
Mark R. S. J. Foreman
Petra J. Panak
Andreas Geist
Thomas Fanghänel

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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

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