Structural Insight into Complexation Ability and Coordination of Uranyl Nitrate by 1,10-Phenanthroline-2,9-diamides

Reprocessing of spent nuclear fuel (SNF) is an important task in a frame of ecology and rational use of natural resources. Uranium, as the main component of SNF (>95%), can be recovered for further use as fresh nuclear fuel. To minimize an amount of solid radioactive waste generated during SNF reprocessing, new extractants are under investigation. Diamides of 1,10-phenanthroline-2,9-dicarboxylic acid are perspective tetradentate N-donor ligands that form strong complexes with f-elements, which are soluble in polar organic solvents. As an example of three ligands of this class, we conducted a comparative study and showed how the substituent in the amide functional group affects the extraction ability toward uranyl nitrate from nitric acid media. We have performed a careful study (NMR, FT-IR, XRD, RMC-EXAFS) of the structures of synthesized complexes of new ligands with uranyl nitrate and used quantum mechanical calculations to explain the discovered regularities through. © 2021 American Chemical Society.

Gutorova S.V.1 , Matveev P.I.1 , Lemport P.S.1 , Trigub A.L. 1, 2 , Pozdeev A.S.1 , Yatsenko A.V.1 , Tarasevich B.N.1 , Konopkina E.A.1 , Khult E.K.3 , Roznyatovsky V.A.1 , Nelyubina Y.V. 4 , Isakovskaya K.L.5 , Khrustalev V.N. 6 , Petrov V.S.1 , Aldoshin A.S.1 , Ustynyuk Y.A.1 , Petrov V.G.1 , Kalmykov S.N.1 , Nenajdenko V.G. 1
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  • 1 Department of Chemistry, Lomonosov Moscow State University, Leninskie gory 1 bld. 3, Moscow, 119991, Russian Federation
  • 2 National Research Center Kurchatov Institute, 123098 Akademika Kurchatova sqr., 1, Moscow, 123098, Russian Federation
  • 3 Department of Materials Science, Lomonosov Moscow State University, Leninskie gory 1 bld. 73, Moscow, 119991, Russian Federation
  • 4 A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, 119334, Russian Federation
  • 5 D.I. Mendeleev University of Chemical Technology of Russia, Moscow, 125047, Russian Federation
  • 6 Department of Inorganic Chemistry, Peoples' Friendship University of Russia (RUDN University), Moscow, 117198, Russian Federation
Amides; Nitrates; Nuclear fuel reprocessing; Nuclear magnetic resonance; Quantum theory; Synthesis (chemical); Diamides; Dicarboxylic acid; Extractants; Phenanthrolines; Solid radioactive wastes; Spent nuclear fuel reprocessing; Spent nuclear fuels; Structural insights; Tetradentate; Uranyl nitrate; Ligands
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