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Electronic Structural Approach to Novel Redox Behavior of Uranium to Explore Chemical Aspects of Nuclear Energy Systems

Research Project

Project/Area Number 20H02663
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 31010:Nuclear engineering-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Takao Koichiro  東京工業大学, 科学技術創成研究院, 准教授 (00431990)

Co-Investigator(Kenkyū-buntansha) 津島 悟  東京工業大学, 科学技術創成研究院, 特任准教授 (80312990)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2020: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
Keywords錯体化学 / ウラン / 酸化還元反応 / ノンイノセント配位子 / 電子構造論
Outline of Research at the Start

ウランの酸化還元挙動は原子力化学における重要な共通基盤である。近年配位子自体が酸化還元活性を示す金属錯体が報告されていることから、ウランの酸化還元反応を単なる中心金属の価数変化という古典的概念のみで説明することはもはや限界であり、分子構造と電子状態の相関を扱った電子構造論の導入による詳細な理解を深めることが重要である。本研究では配位子デザイン、錯体合成・構造解析・電気化学測定などの実験と量子化学計算による理論的解析を融合することにより、レドックスアクティブ配位子を持つウラン錯体の酸化還元挙動を電子構造論に基づいて明らかにし、錯体構造中の酸化還元活性部位の決定要因を解明する。

Outline of Final Research Achievements

Redox behavior of uranium is one of essential fundamentals in nuclear chemistry. Recently, metal complexes in which ligand itself exhibits redox activity have been reported, implying that describing redox reactions of U complexes solely by a change in the valence of the center metal is no longer appropriate. Therefore, it is important to deepen our detailed understanding by introducing electronic structure theory, which deals with correlation between molecular structure and electronic state of a complex of interest. In this study, we have clarified redox behavior of several U complexes bearing redox-active ligands as well as determining factors of redox active sites in these molecular structures by combining experimental approach (e.g., molecular design of ligands, synthesis and characterization of U complexes, and electrochemical measurements) with theoretical analysis using quantum chemical calculations.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた成果は、使用済み核燃料や放射性廃棄物の処理・処分および福島原発事故復旧といった原子力化学における重要な共通基盤であるウランの酸化還元挙動の新たな局面を切り拓くものであり、提案時に目的とした原子力化学における学術基盤強化に大きく貢献するものである。また、学術面だけに留まらず、レドックスアクティブ配位子に誘起されるウラン錯体の新規反応性開拓など更なる機能創出など劣化ウランの有効活用および資源化のための重要な技術基盤の構築にもつながる重要な知見が得られた。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (25 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (9 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 9 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (5 results)

  • [Int'l Joint Research] Helmholtz-Zentrum Dresden-Rossendorf(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Helmholtz-Zentrum Dresden-Rossendorf(ドイツ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ヘルムホルツ研究センタードレスデン-ロッセンドルフ(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Helmholtz-Zentrum Dresden-Rossendorf(ドイツ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Securing Reversibility of UVO2+/UVIO22+ Redox Equilibrium in [emim]Tf2N‐Based Liquid Electrolytes towards Uranium Redox‐Flow Battery2024

    • Author(s)
      Takao Koichiro、Ouchi Kazuki、Komatsu Atsushi、Kitatsuji Yoshihiro、Watanabe Masayuki
    • Journal Title

      European Journal of Inorganic Chemistry

      Volume: - Issue: 14

    • DOI

      10.1002/ejic.202300787

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Utility of redox-active ligands for reversible multi-electron transfer in uranyl(VI) complexes2023

    • Author(s)
      Takeyama Tomoyuki、Tsushima Satoru、Takao Koichiro
    • Journal Title

      Inorganic Chemistry Frontiers

      Volume: - Issue: 14 Pages: 4028-4044

    • DOI

      10.1039/d3qi00189j

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fate of Oxidation States at Actinide Centers in Redox‐Active Ligand Systems Governed by Energy Levels of 5f Orbitals2023

    • Author(s)
      Takeyama Tomoyuki、Tsushima Satoru、Gericke Robert、Kaden Peter、Maerz Juliane、Takao Koichiro
    • Journal Title

      Chemistry - A European Journal

      Volume: 29 Issue: 69

    • DOI

      10.1002/chem.202302702

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effects of coordinating heteroatoms on molecular structure, thermodynamic stability and redox behavior of uranyl(<scp>vi</scp>) complexes with pentadentate Schiff-base ligands2022

    • Author(s)
      Takeyama Tomoyuki、Takao Koichiro
    • Journal Title

      RSC Advances

      Volume: 12 Issue: 37 Pages: 24260-24268

    • DOI

      10.1039/d2ra04639c

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Fully Chelating N<sub>3</sub>O<sub>2</sub>-Pentadentate Planar Ligands Designed for the Strongest and Selective Capture of Uranium from Seawater2022

    • Author(s)
      Mizumachi Takumi、Sato Minami、Kaneko Masashi、Takeyama Tomoyuki、Tsushima Satoru、Takao Koichiro
    • Journal Title

      Inorganic Chemistry

      Volume: 61 Issue: 16 Pages: 6175-6181

    • DOI

      10.1021/acs.inorgchem.2c00306

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Synthesis and characterization of a uranyl(<scp>vi</scp>) complex with 2,6-pyridine-bis(methylaminophenolato) and its ligand-centred aerobic oxidation mechanism to a diimino derivative2022

    • Author(s)
      Takeyama Tomoyuki、Iwatsuki Satoshi、Tsushima Satoru、Takao Koichiro
    • Journal Title

      Dalton Transactions

      Volume: 51 Issue: 17 Pages: 6576-6586

    • DOI

      10.1039/d2dt00325b

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effects of Substituents on the Molecular Structure and Redox Behavior of Uranyl(V/VI) Complexes with N<sub>3</sub>O<sub>2</sub>-Donating Schiff Base Ligands2021

    • Author(s)
      Takeyama Tomoyuki、Tsushima Satoru、Takao Koichiro
    • Journal Title

      Inorganic Chemistry

      Volume: 60 Issue: 15 Pages: 11435-11449

    • DOI

      10.1021/acs.inorgchem.1c01449

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Coordination Chemistry of Actinide Nitrates with Cyclic Amide Derivatives for the Development of the Nuclear Fuel Materials Selective Precipitation (NUMAP) Reprocessing Method2020

    • Author(s)
      Takao Koichiro、Ikeda Yasuhisa
    • Journal Title

      European Journal of Inorganic Chemistry

      Volume: 2020 Issue: 36 Pages: 3443-3459

    • DOI

      10.1002/ejic.202000504

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Molecular Design of Double-headed 2-Pyrrolidone Derivatives for Separation/Co-precipitation of UO22+ from/with Tetravalent Actinides towards Nuclear Fuel Recycling2020

    • Author(s)
      Kazama Hiroyuki、Takao Koichiro
    • Journal Title

      Chemistry Letters

      Volume: 49 Issue: 10 Pages: 1201-1205

    • DOI

      10.1246/cl.200457

    • NAID

      130007923220

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Direct Reduction of NpVIO22+ to NpIV Driven by Electron Transfer from Redox-active Ligand2023

    • Author(s)
      竹山知志, 津島悟, Robert Gericke, Peter Kaden, Juliane Maerz, 鷹尾康一朗
    • Organizer
      錯体化学会第73回討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Molecular Design of Pentadentate Planar Ligand and Its Coordination with UO22+ towards Uranium Recovery from Seawater2022

    • Author(s)
      Takao, K.; Mizumachi, T.; Sato, M.; Kaneko, M.; Takeyama, T.; Tsushima, S.
    • Organizer
      ATAS-AnXAS Workshop
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effects of Substituents on the Molecular Structure and Redox Behavior of Uranyl(V/VI) Complexes with N3O2-Donating Schiff Base Ligands2022

    • Author(s)
      Takeyama, T.; Tsushima, T.; Takao, K.
    • Organizer
      44th International Conference on Coordination Chemistry (ICCC2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Experimental and Theoretical Investigation of Singly and Doubly Reduced Uranyl(VI) Complexes with Redox-active Ligands2022

    • Author(s)
      竹山知志, 津島悟, 鷹尾康一朗
    • Organizer
      錯体化学会 第72回討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Aerobic Oxidation of Pyridine-2,6-diamine-o-phenolate Coordinating to Uranyl(VI) Ion2021

    • Author(s)
      Takeyama, T.; Tsushima, S.; Takao, K.
    • Organizer
      The International Chemical Congress of Pacific Basin Societies 2021 (Pacifichem2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] N3O2-, N2O3-, N2O2S1-型平面5座シッフ塩基配位子とウラニル(VI)イオンの錯形成挙動におけるHSAB則の検証2021

    • Author(s)
      竹山知志, 津島悟, 鷹尾康一朗
    • Organizer
      日本原子力学会2022年春の年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Redox Center of Symmetric and Asymmetric Complexes of Uranyl(VI) with Pentadentate Pyridine-2,6-diimino-bis(o-phenolate) Ligands2021

    • Author(s)
      竹山知志, 津島悟, 鷹尾康一朗
    • Organizer
      第71回錯体化学討論会
    • Related Report
      2021 Annual Research Report
  • [Remarks] 2-1. ウラン錯体化学の深化:余剰ウランの資源化および有効活用法開拓

    • URL

      https://takao.zc.iir.titech.ac.jp/research/research.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] 研究業績

    • URL

      https://takao.zc.iir.titech.ac.jp/publications/publications.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] 2-1. ウラン錯体化学の深化:余剰ウランの資源化および有効活用法開拓

    • URL

      http://www.zc.iir.titech.ac.jp/~ktakao/research/research.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 1-3. ウラン錯体化学の深化:余剰ウランの資源化および有効活用法開拓

    • URL

      http://www.zc.iir.titech.ac.jp/~ktakao/research/research.html

    • Related Report
      2021 Annual Research Report
  • [Remarks] 研究内容:1-3. ウラン錯体化学の深化:余剰ウランの資源化および有効活用法開拓

    • URL

      http://www.lane.iir.titech.ac.jp/~ktakao/research/research.html

    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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