2,6-Bis(1-alkyl-1H-1,2,3-triazol-4-yl)-pyridines: selective lipophilic chelating ligands for minor actinides
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Starting from the promising minor actinides (MA) affinity showed by the water-soluble ligands (PyTri-polyols) with the 2,6-bis[1H-1,2,3-triazol-4-yl]-pyridine chelating unit, different attempts were made to functionalize the same N3-donor set with alkyl chains in the 1-position of triazole nuclei to obtain novel lipophilic extractants endowed with comparable MA selectivity. Solubility in organic diluents was found to be the main limitation to the development of efficient lipophilic ligands, thus resulting in less efficient extractants with respect to their hydrophilic analogues and sometimes impairing the selectivity evaluation. Interestingly, the ethyl hexyl derivative (PTEH) showed adequate extraction capability and a MA selectivity comparable to that of the hydrophilic PyTri family.
KeywordsPartitioning Selective MA extraction Nitrogen ligand PyTri ligand Click chemistry Radioactive waste treatment
This work was supported by EU-FP7 ACSEPT (Grant No. 211267), SACSESS (Grant No. 323282), EU-H2020 GENIORS (Grant No. 755171) projects and by the Italian Ministry of Education, University and Research. Thanks are also due to Centro Interdipartimentale Misure “G. Casnati” of Parma University for NMR and mass measurements.
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