title: 2,6-Bis(5-(2,2-dimethylpropyl)-1H-pyrazol-3-yl)pyridine as a ligand for efficient actinide(III)/lanthanide(III) separation.
abstract: 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.
authors.affiliation: Institut für Nukleare Entsorgung, Karlsruher Institut für Technologie, P.O. Box 3640, 76021 Karlsruhe, Germany.
authors.forename: Antje
authors.initials: A
authors.lastname: Bremer
authors.forename: Christian M
authors.initials: CM
authors.lastname: Ruff
authors.forename: Denise
authors.initials: D
authors.lastname: Girnt
authors.forename: Udo
authors.initials: U
authors.lastname: Müllich
authors.forename: Jörg
authors.initials: J
authors.lastname: Rothe
authors.forename: Peter W
authors.initials: PW
authors.lastname: Roesky
authors.forename: Petra J
authors.initials: PJ
authors.lastname: Panak
authors.forename: Alexei
authors.initials: A
authors.lastname: Karpov
authors.forename: Thomas J J
authors.initials: TJ
authors.lastname: Müller
authors.forename: Melissa A
authors.initials: MA
authors.lastname: Denecke
authors.forename: Andreas
authors.initials: A
authors.lastname: Geist