2020 Fiscal Year Research-status Report
Development of Gas-Responsive Porous Magnets via Host-Guest Charge Transfer
| Project/Area Number |
20K15294
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| Research Institution | Tohoku University |
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Principal Investigator |
張 俊 東北大学, 学際科学フロンティア研究所, 助教 (70870103)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | Porous magnet / Host-guest chemistry / Charge transfer |
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| Outline of Annual Research Achievements |
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.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
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.
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| Strategy for Future Research Activity |
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.
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