2,6-Bis(5-(2,2-dimethylpropyl)-1H-pyrazol-3-yl)pyridine as a ligand for efficient actinide(III)/lanthanide(III) separation

Antje Bremer, Christian M. Ruff, Denise Girnt, Udo Müllich, Jörg Rothe, Peter W. Roesky, Petra J. Panak, Alexei Karpov, Thomas J J Müller, Melissa A. Denecke, Andreas Geist

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The N-donor complexing ligand 2,6-bis(5-(2,2-dimethylpropyl)-1H-pyrazol-3- yl)pyridine (C5-BPP) was synthesized and screened as an extracting agent selective for trivalent actinide cations over lanthanides. C5-BPP extracts Am(III) from up to 1 mol/L HNO 3 with a separation factor over Eu(III) of approximately 100. Due to its good performance as an extracting agent, the complexation of trivalent actinides and lanthanides with C5-BPP was studied. The solid-state compounds [Ln(C5-BPP)(NO 3) 3(DMF)] (Ln = Sm(III), Eu(III)) were synthesized, fully characterized, and compared to the solution structure of the Am(III) 1:1 complex [Am(C5-BPP)(NO 3) 3]. The high stability constant of log β 3 = 14.8 ± 0.4 determined for the Cm(III) 1:3 complex is in line with C5-BPP's high distribution ratios for Am(III) observed in extraction experiments. © 2012 American Chemical Society.
Original languageEnglish
Pages (from-to)5199-5207
Number of pages8
JournalInorganic Chemistry: including bioinorganic chemistry
Issue number9
Publication statusPublished - 7 May 2012

Research Beacons, Institutes and Platforms

  • Dalton Nuclear Institute


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