Journal
INORGANIC CHEMISTRY
Volume 58, Issue 21, Pages 14642-14651Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.9b02325
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Project GENIORS) [755171]
- Italian Ministry for Education, University and Research (MIUR)
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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 pK(a) value (pK(a) = 2.54) compared to PTD (pK(a) = 2.1). This counteracts its improved complexation properties for Cm(III) (log beta(3)(PTD-OMe) = 10.8 +/- 0.4 versus log beta(3)(PTD) = 9.9 +/- 0.5).
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