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2020 年度 実施状況報告書

ホスト-ゲスト電荷移動によるガス応答性多孔質磁石の開発

研究課題

研究課題/領域番号 20K15294
研究機関東北大学

研究代表者

張 俊  東北大学, 学際科学フロンティア研究所, 助教 (70870103)

研究期間 (年度) 2020-04-01 – 2022-03-31
キーワードPorous magnet / Host-guest chemistry / Charge transfer
研究実績の概要

The host-guest charge transfer (HGCT) that involves the electronic interaction between the host framework and the inserted guest is a promising strategy for the rational design of the chemo-responsive magnet, but it has never been experimentally observed. We herein found a redox-active metal-organic framework, [{Ru2(2,6-F2PhCO2)4}2(BTDA-TCNQ)] (1; 2,6-F2PhCO2- = 2,6-difluorobenzoate; BTDA-TCNQ = bis[1,2,5]dithiazolotetracyanoquinodimethane), which shows antiferromagnetic long-range ordering at TN = 90 K. Through adsorption of electron-withdrawing molecule iodine (I2), the magnetic phase changed from antiferromagnetism to paramagnetism. The single-crystal X-ray diffraction and spectral analysis proved that the change of magnetic phase is induced by HGCT between the building unit (BTDA-TCNQ)- and I2 molecule. Both HGCT and magnetic phase change are reversible during the I2 adsorption and desorption process. This work demonstrates for the first time the regulation of magnetism via HGCT, which may aid the design of the new porous magnets.

現在までの達成度 (区分)
現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

My research project is to control the magnetism in porous magnets by guest molecules via host-guest charge transfer (HGCT). Last year, I synthesized a redox-active metal-organic framework, [{Ru2(2,6-F2PhCO2)4}2(BTDA-TCNQ)] (1), of which the (BTDA-TCNQ)- unit shows electron-donating ability. Then the guest sorption of electron-withdrawing molecule I2 was conducted for compound 1. Finally, the magnetism was successfully manipulated between antiferromagnetism and paramagnetism by the I2 sorption via HGCT.

今後の研究の推進方策

Now, the modulation of magnetism through host-guest charge transfer (HGCT) was Now, the modulation of magnetism through host-guest charge transfer (HGCT) was only achieved by electron-withdrawing molecule I2. Next, I'd like to choose other
electron-withdrawing molecules such as NO, O2, Br2, IBr as guest molecules. The magnetic properties, crystal structures, and spectral changes will be measured for the material containing other electron-withdrawing molecules inside the pore.

  • 研究成果

    (6件)

すべて 2021 2020 その他

すべて 雑誌論文 (2件) (うち国際共著 1件、 査読あり 2件) 学会発表 (2件) (うち国際学会 1件、 招待講演 1件) 備考 (2件)

  • [雑誌論文] A metal-organic framework that exhibits CO2-induced transitions between paramagnetism and ferrimagnetism2021

    • 著者名/発表者名
      Zhang Jun, Kosaka Wataru, Kitagawa Yasutaka, Miyasaka Hitoshi
    • 雑誌名

      Nature Chemistry

      巻: 13 ページ: 191~199

    • DOI

      10.1038/s41557-020-00577-y

    • 査読あり
  • [雑誌論文] Magnet creation by guest insertion into a paramagnetic charge-flexible layered metal-organic framework2021

    • 著者名/発表者名
      Jun Zhang, Wataru Kosaka, Hiroyasu Sato, Hitoshi Miyasaka
    • 雑誌名

      Journal of the American Chemical Society

      巻: 143 ページ: xxx-xxx

    • DOI

      10.1021/jacs.1c01537

    • 査読あり / 国際共著
  • [学会発表] Temperature- and Guest-Driven Electronic State Modulation in Molecular Magnets2021

    • 著者名/発表者名
      Jun Zhang, Wataru Kosaka, Hiroyasu Sato, Hitoshi Miyasaka.
    • 学会等名
      The 1st Asian Conference on Molecular Magnetism
    • 国際学会
  • [学会発表] Electronic State Modulation of Magnetic Sponge upon Solvents and Gases2020

    • 著者名/発表者名
      Jun Zhang
    • 学会等名
      日本化学会第100春季年会;Asian International Symposium - Inorganic Chemistry / Coordination Chemistry and Organometallic Chemistry
    • 招待講演
  • [備考] 分子の吸着で磁石を創る 吸着分子に依存した磁気相変換の実現

    • URL

      https://www.tohoku.ac.jp/japanese/2021/04/post-62.html

  • [備考] 二酸化炭素の吸脱着による磁石のON-OFF制御に成功ー”二酸化炭素磁気センサー”への道筋

    • URL

      http://www.tohoku.ac.jp/japanese/2020/12/press20201201-01-mof.html

URL: 

公開日: 2021-12-27  

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