There is still an evident need for selective and stable ligands able to separate actinide(III) from lanthanide(III) metal ions in view of the treatment of the accumulated radioactive waste and of the recycling of minor actinides. We have herein demonstrated that hydrophilic 2,6-bis-triazolyl-pyridines are able to strip all actinides in all the different oxidation states from a diglycolamide-containing kerosene solution into an acidic aqueous phase. The ascertained high actinide selectivity, efficiency, extraction kinetics, and chemical/radiolytic stability spotlight this hydrophilic class of ligands as exceptional candidates for advanced separation processes fundamental for closing the nuclear fuel cycle and solving the environmental issues related to the management of existing nuclear waste.
A systematic study on the synthesis and properties of aza-
[5]helicenes bearing one or two nitrogen atoms in selected
ring positions is reported for the first time. This photochemical
approach can be conveniently applied to the preparation
of either mono- or diaza[5]helicenes. The aza[5]helicenes
were characterized by NMR spectroscopy, X-ray crystallography, emission spectroscopy, and luminescence lifetime.
The extremely long triplet lifetime observed (in the range
of seconds) makes these molecules promising candidates for
practical applications in photo- and optoelectronics
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