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

• Verfasst von: Trumm, Sascha [VerfasserIn]
• Verfasst von: Lieser, Georg [VerfasserIn]
• Verfasst von: Foreman, Mark R. S. J. [VerfasserIn]
• Verfasst von: Panak, Petra [VerfasserIn]
• Verfasst von: Geist, Andreas [VerfasserIn]
• Verfasst von: Fanghänel, Thomas [VerfasserIn]
• Titel: 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
• Verf.angabe: Sascha Trumm, Georg Lieser, Mark R.S.J. Foreman, Petra J. Panak, Andreas Geist, and Thomas Fanghänel
• Jahr: 2010
• Umfang: 7 S.
• Fussnoten: Erstmals am 20th November 2009 online veröffentlicht ; Gesehen am 19.01.2024
• Titel Quelle: Enthalten in: Dalton transactions
• Ort Quelle: London : Soc., 1972
• Jahr Quelle: 2010
• Band/Heft Quelle: 39(2010), 3, Seite 923-929
• ISSN Quelle: 1477-9234
• DOI: doi:10.1039/B919247F
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 187847667X

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.