Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 24, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/ijms241210261
Keywords
phenanthroline; macrocycle; lanthanide; actinide; solvent extraction; DFT; NMR; XRD
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The reaction of acyl chlorides derived from 1,10-phenanthroline-2,9-dicarboxylic acids with piperazine allows the preparation of 24-membered macrocycles in good yield. These new macrocyclic ligands have promising coordination properties towards f-elements, particularly Am and Eu. They exhibit higher extraction efficiency for Am(III) compared to calixarene-type extraction, and the composition of the macrocycle-metal complex with Eu(III) has been investigated.
A reaction of acyl chlorides derived from 1,10-phenanthroline-2,9-dicarboxylic acids with piperazine allows the preparation of the corresponding 24-membered macrocycles in good yield. The structural and spectral properties of these new macrocyclic ligands were thoroughly investigated, revealing promising coordination properties towards f-elements (Am, Eu). It was shown that the prepared ligands can be used for selective extraction of Am(III) from alkaline-carbonate media in presence of Eu(III) with an SFAm/Eu up to 40. Their extraction efficiency is higher than calixarene-type extraction of the Am(III) and Eu(III) pair. Composition of macrocycle-metal complex with Eu(III) was investigated by luminescence and UV-vis spectroscopy. The possibility of such ligands to form complexes of L:Eu = 1:2 stoichiometry is revealed.
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