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Grigoriev MS, Charushnikova IA, Budantseva NA, Fedoseev AM. Mixed-Valence Np V/An VI Molybdate Complexes with Single-Charge Outer-Sphere Cations. Inorg Chem 2023; 62:12708-12720. [PMID: 37504518 DOI: 10.1021/acs.inorgchem.3c01098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Five new mixed-valence NpV/AnVI molybdates of the composition [C(NH2)3]3[(NpVO2)(NpVIO2)(MoO4)3(H2O)]·H2O (1), [C(NH2)3]3[(NpVO2)(NpVIO2)(MoO4)3(H2O)]·3H2O (2), Na3[(NpVO2)(PuVIO2)(MoO4)3(H2O)]·nH2O (3), Na6[(NpVO2)2(UVIO2)(MoO4)5]·13H2O (4), and LiNa2[(NpVO2)(NpVIO2)2(MoO4)4(H2O)]·4H2O (5) have been synthesized and structurally characterized. The coordination polyhedra of the NpV and AnVI atoms in compounds 1-5 are pentagonal bipyramids. The basis of structures 1-3 is anionic layers of the composition [(NpVO2)(AnVIO2)(MoO4)3(H2O)]n3n-. Three crystallographically independent molybdate ions are tridentate-bridging ligands. The water molecule, which is a part of the anion layer, is coordinated to the NpV atom. The anionic layers in complexes 2 and 3 have the same structure, different from 1. The basis of structure 4 is anionic layers of the composition [(NpVO2)2(UVIO2)(MoO4)5]n6n-, the structure of which differs from the structure of anionic layers in 1-3. Complex 5 has a three-dimensional (3D) structure. The spectra of all compounds in the UV-visible and IR ranges were measured and analyzed.
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Affiliation(s)
- Mikhail S Grigoriev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russian Federation
| | - Iraida A Charushnikova
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russian Federation
| | - Nina A Budantseva
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russian Federation
| | - Alexander M Fedoseev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow 119071, Russian Federation
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Deason TK, Hines AT, Morrison G, Smith MD, Besmann TM, Mofrad AM, Fondeur FF, Lehman-Andino I, Amoroso JW, DiPrete DP, Zur Loye HC. Flux Crystal Growth of the Extended Structure Pu(V) Borate Na 2(PuO 2)(BO 3). J Am Chem Soc 2023; 145:10007-10014. [PMID: 37097728 DOI: 10.1021/jacs.2c11355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
As part of our exploration of plutonium-containing materials as potential nuclear waste forms, we report the first extended structure Pu(V) material and the first Pu(V) borate. Crystals of Na2(PuO2)(BO3) were grown out of mixed hydroxide/boric acid flux and found to crystallize in the orthorhombic space group Cmcm with lattice parameters of a = 9.9067(4) Å, b = 6.5909(2) Å, and c = 6.9724(2) Å. Na2(PuO2)(BO3) adopts a layered structure in which layers of PuO2(BO3)2- are separated by sodium cations. Plutonium is found in a pentagonal bipyramidal coordination environment, with axial Pu(V)-O plutonyl bond lengths of 1.876(3) Å and equatorial Pu-O bond lengths ranging from 2.325(5) to 2.467(3) Å. We find that the Pu(V)-O plutonyl bond lengths are approximately 0.1 Å longer than the reported Pu(VI)-O plutonyl bond lengths and shorter by approximately 0.033 Å than the corresponding U(V) uranyl bond lengths. Raman spectroscopy on single crystals was used to determine the PuO2+ plutonyl stretching and the equatorial breathing mode frequencies of the pentagonal bipyramidal coordination environment around plutonium. Density functional theory calculations were used to calculate the Raman spectrum to help identify the Raman bands at 690 and 630 cm-1 as corresponding to the plutonyl(V) ν1 stretch and the equatorial PuO5 breathing mode, respectively. UV-vis measurements on single crystals indicate semiconducting behavior with a band gap of ∼2.60 eV.
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Affiliation(s)
- Travis K Deason
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
- Savannah River National Laboratory, Aiken, South Carolina 29803, United States
| | - Adrian T Hines
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Gregory Morrison
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Theodore M Besmann
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Amir M Mofrad
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Department of Mechanical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Fernando F Fondeur
- Savannah River National Laboratory, Aiken, South Carolina 29803, United States
| | - Ingrid Lehman-Andino
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Savannah River National Laboratory, Aiken, South Carolina 29803, United States
| | - Jake W Amoroso
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Savannah River National Laboratory, Aiken, South Carolina 29803, United States
| | - David P DiPrete
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Savannah River National Laboratory, Aiken, South Carolina 29803, United States
| | - Hans-Conrad Zur Loye
- Center for Hierarchical Waste Form Materials, Columbia, South Carolina 29208, United States
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
- Savannah River National Laboratory, Aiken, South Carolina 29803, United States
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