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Activation of the aromatic core of 3,3′-(Pyridine-2,6-diylbis(1H-1,2,3-triazole-4,1-diyl))bis(propan-1-ol): effects on extraction performance, stability constants, and basicity

The “CHON” compatible water-soluble ligand 3,3′-(pyridine-2,6-diylbis(1H-1,2,3-triazole-4,1-diyl))bis(propan-1-ol) (PTD) has shown promise for selectively stripping actinide ions from an organic phase containing both actinide and lanthanide ions, by preferential complexation of the former. Aiming at...

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Main Authors: Weßling, Patrik (Author) , Trumm, Michael (Author) , Macerata, Elena (Author) , Ossola, Annalisa (Author) , Mossini, Eros (Author) , Gullo, Maria Chiara (Author) , Arduini, Arturo (Author) , Casnati, Alessandro (Author) , Mariani, Mario (Author) , Adam, Christian (Author) , Geist, Andreas (Author) , Panak, Petra (Author)
Format: Article (Journal)
Language:English
Published: October 14, 2019
In: Inorganic chemistry
Year: 2019, Volume: 58, Issue: 21, Pages: 14642-14651
ISSN:1520-510X
DOI:10.1021/acs.inorgchem.9b02325
Online Access:Verlag, Volltext: https://doi.org/10.1021/acs.inorgchem.9b02325
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Author Notes:Patrik Weßling, Michael Trumm, Elena Macerata, Annalisa Ossola, Eros Mossini, Maria Chiara Gullo, Arturo Arduini, Alessandro Casnati, Mario Mariani, Christian Adam, Andreas Geist, and Petra J. Panak
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Summary:The “CHON” compatible water-soluble ligand 3,3′-(pyridine-2,6-diylbis(1H-1,2,3-triazole-4,1-diyl))bis(propan-1-ol) (PTD) has shown promise for selectively stripping actinide ions from an organic phase containing both actinide and lanthanide ions, by preferential complexation of the former. Aiming at improving its complexation properties, PTD-OMe was synthesized, bearing a methoxy group on the central pyridine ring, thus increasing its basicity and hence complexation strength. Unfortunately, solvent extraction experiments in the range of 0.1-1 mol/L nitric acid proved PTD-OMe to be less efficient than PTD. This behavior is explained by its greater pKa value (pKa = 2.54) compared to PTD (pKa = 2.1). This counteracts its improved complexation properties for Cm(III) (log β3(PTD-OMe) = 10.8 ± 0.4 versus log β3(PTD) = 9.9 ± 0.5).
Item Description:Gesehen am 04.12.2019
Physical Description:Online Resource
ISSN:1520-510X
DOI:10.1021/acs.inorgchem.9b02325

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