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Title: Plutonium and Cerium Perrhenate/Pertechnetate Coordination Polymers and Frameworks

Abstract

Spent nuclear fuel (SNF) contains transuranic and lanthanide species, which are sometimes recovered and repurposed. One particularly problematic fission product, 99TcO4, hampers this recovery via coextraction with high valence metals, perhaps by complexation during aqueous reprocessing of SNF. There is limited molecular-level knowledge concerning the coordination chemistry between TcO4 or its well-known surrogate ReO4 and transuranic/lanthanide species. In the current study, we investigated the coordination of ReO4/TcO4 with plutonium and cerium cations by structural and chemical characterization of a series of isolated extended solids. In this study, Ce represents both trivalent lanthanides and is considered a surrogate for Pu, respectively, in its common trivalent and tetravalent oxidation states. The structural elucidation of the seven isolated crystalline solids revealed that ReO4/TcO4 directly connects to PuIV, PuVIO2 2+, CeIII, and CeIV in the terminal and bridging coordination modes, leading to 1-, 2-, and 3-dimensional frameworks. For example, ReO4 coordination to Pu(IV) formed a 1D chain or 2D framework, isostructural with previously isolated Th(IV) compounds. However, PuVIO2 2+ alternating with ReO4 led to a unique 1D chain, different from the prior-reported U(VI)/Np(VI)-ReO4/TcO4 structures. Coordination of ReO4/TcO4 with Ce(III) promotes the assembly of 3D frameworks. Finally, attempted synthesis of a Ce(IV)-ReO4 compound resulted inmore » a 2D framework with a mixed-valence CeIII/IV. The highly acidic reaction conditions supported the reduction of both CeIV and TcVII, challenging isolation of compounds featuring these species. Only one TcO4-containing structure was obtained in this study (CeIII–TcO4 3D framework), vs the six total Ce/Pu-ReO4 compounds. Furthermore, our three Pu-ReO4 crystal structures are the first reported and translated to atomic-level information about Pu-TcO4 coordination in nuclear fuel reprocessing scenarios, in addition to broadening our knowledge of bonding trends in the early, high-valence actinides.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Oregon State University, Corvallis, OR (United States)
  2. University of Notre Dame, IN (United States)
Publication Date:
Research Org.:
University of Notre Dame, IN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
2299507
Grant/Contract Number:  
NA0003763
Resource Type:
Accepted Manuscript
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 63; Journal Issue: 4; Journal ID: ISSN 0020-1669
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; Chemical structure; Crystals; Materials; Organic polymers; Vinyl

Citation Formats

Shohel, Mohammad, Sockwell, A. Kirstin, Hixon, Amy E., and Nyman, May. Plutonium and Cerium Perrhenate/Pertechnetate Coordination Polymers and Frameworks. United States: N. p., 2024. Web. doi:10.1021/acs.inorgchem.3c03846.
Shohel, Mohammad, Sockwell, A. Kirstin, Hixon, Amy E., & Nyman, May. Plutonium and Cerium Perrhenate/Pertechnetate Coordination Polymers and Frameworks. United States. https://doi.org/10.1021/acs.inorgchem.3c03846
Shohel, Mohammad, Sockwell, A. Kirstin, Hixon, Amy E., and Nyman, May. Wed . "Plutonium and Cerium Perrhenate/Pertechnetate Coordination Polymers and Frameworks". United States. https://doi.org/10.1021/acs.inorgchem.3c03846.
@article{osti_2299507,
title = {Plutonium and Cerium Perrhenate/Pertechnetate Coordination Polymers and Frameworks},
author = {Shohel, Mohammad and Sockwell, A. Kirstin and Hixon, Amy E. and Nyman, May},
abstractNote = {Spent nuclear fuel (SNF) contains transuranic and lanthanide species, which are sometimes recovered and repurposed. One particularly problematic fission product, 99TcO4–, hampers this recovery via coextraction with high valence metals, perhaps by complexation during aqueous reprocessing of SNF. There is limited molecular-level knowledge concerning the coordination chemistry between TcO4– or its well-known surrogate ReO4– and transuranic/lanthanide species. In the current study, we investigated the coordination of ReO4–/TcO4– with plutonium and cerium cations by structural and chemical characterization of a series of isolated extended solids. In this study, Ce represents both trivalent lanthanides and is considered a surrogate for Pu, respectively, in its common trivalent and tetravalent oxidation states. The structural elucidation of the seven isolated crystalline solids revealed that ReO4–/TcO4– directly connects to PuIV, PuVIO2 2+, CeIII, and CeIV in the terminal and bridging coordination modes, leading to 1-, 2-, and 3-dimensional frameworks. For example, ReO4– coordination to Pu(IV) formed a 1D chain or 2D framework, isostructural with previously isolated Th(IV) compounds. However, PuVIO2 2+ alternating with ReO4– led to a unique 1D chain, different from the prior-reported U(VI)/Np(VI)-ReO4–/TcO4– structures. Coordination of ReO4–/TcO4– with Ce(III) promotes the assembly of 3D frameworks. Finally, attempted synthesis of a Ce(IV)-ReO4– compound resulted in a 2D framework with a mixed-valence CeIII/IV. The highly acidic reaction conditions supported the reduction of both CeIV and TcVII, challenging isolation of compounds featuring these species. Only one TcO4-containing structure was obtained in this study (CeIII–TcO4 3D framework), vs the six total Ce/Pu-ReO4 compounds. Furthermore, our three Pu-ReO4 crystal structures are the first reported and translated to atomic-level information about Pu-TcO4 coordination in nuclear fuel reprocessing scenarios, in addition to broadening our knowledge of bonding trends in the early, high-valence actinides.},
doi = {10.1021/acs.inorgchem.3c03846},
journal = {Inorganic Chemistry},
number = 4,
volume = 63,
place = {United States},
year = {Wed Jan 17 00:00:00 EST 2024},
month = {Wed Jan 17 00:00:00 EST 2024}
}

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