Coordination of Fluorine-Substituted 1,10-Phenanthroline Diphosphonates with Americium(III) and Lanthanides(III): Solvent Extraction, Complexation, XRD, and Theoretical Study

Evsiunina, M.V.; Huang, P.; Kalle, P.; Abel, A.S.; Korinskiy, N.A.; Konopkina, E.A.; Kirsanova, A.A.; Lanin, L.O.; Borisova, N.E.; Shi, W.; Matveev, P.I.

Авторы: Evsiunina Mariia V., Huang Pin-Wen, Kalle Paulina, Abel Anton S., Korinskiy Nikolay A., Konopkina Ekaterina A., Kirsanova Anna A., Lanin Leonid O., Borisova Nataliya E., Shi Wei-Qun, Matveev Petr I.
Журнал: Inorganic Chemistry
Том: 63
Номер: 50
Год издания: 2024
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 23789
Последняя страница: 23801
DOI: 10.1021/acs.inorgchem.4c03978
Аннотация: Hybrid N,O-donor ligands based on 1,10-phenanthroline are a promising class of compounds for processing high-level waste. Here, we synthesized novel phenanthroline-based diphosphonates containing electron-withdrawing fluorine atoms in alkyl substituents. We studied their extraction properties for Am(III) and, for the first time, for the entire series of lanthanides(III). The extraction of nitric acid for these diphosphonates was also studied. It has been shown that replacing one hydrogen atom with a fluorine atom in the ethyl substituent of a diphosphonate leads to a decrease in the affinity of the ligands for metal cations. Replacing two hydrogen atoms leads to a decrease in the affinity of the ligands for both metal cations and protons. But such modifications led to a change in the nature of the extraction of Am(III) and Eu(III) from nitric acid solutions, and as a result, the diphosphonate with two substituted hydrogen atoms retains its extraction properties when extracted from 5 mol/L HNO3. The complexation in solution was studied by using ultraviolet–visible (UV–vis) titration for Nd(NO3)3 and Eu(NO3)3. The study of complexation in solid form using SC-XRD revealed the formation of complexes of the composition LnL(NO3)3, as well as the possibility of the formation of hydrolyzed binuclear complexes [Eu(μ2,κ4-(RO)2P(O)Phen(O)2(OR))(NO3)2]2. Density functional theory (DFT) calculations were performed to gain more insight into coordination properties and describe experimental data. It was shown that introducing fluorine atoms decreases the charge modules for both Nphen and OP═O and decreases the protonation energy.
Добавил в систему: Матвеев Петр Игоревич

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Coordination of Fluorine-Substituted 1,10-Phenanthroline Diphosphonates with Americium(III) and Lanthanides(III): Solvent Extraction, Complexation, XRD, and Theoretical Studyстатья

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