柔軟な多孔性結晶を舞台としたドナー／アクセプター配列の動的制御

2017 Fiscal Year Annual Research Report

• Project/Area Number: 15F15339
• Research Institution: The University of Tokyo
• Principal Investigator: 佐藤 弘志 東京大学, 大学院工学系研究科(工学部), 講師 (20598586)
• Co-Investigator(Kenkyū-buntansha): AU KA MAN 東京大学, 工学(系)研究科(研究院), 外国人特別研究員
• Project Period (FY): 2015-11-09 – 2018-03-31
• Keywords: 多孔体 / 結晶 / 構造変化

Outline of Annual Research Achievements

The exfoliation of two-dimensional (2D) materials such as graphite, layered transition metal dichalcogenides, layered double hydroxides and layered boron nitrides, has been demonstrated to give rise to extraordinary thermoelectric, catalytic, or separation properties. On the other hand, related studies of layered porous materi-als such as MOFs are comparatively less explored. While the top-down approach has been employed to exfoliate MOF nanosheets for ultrathin membranes, there still lacks an effective protocol to selectively obtain nanosheets of desired thickness and number of layers. We synthesized two 2D Cu(II) kagome MOFs, and explored the unique and reversible expansion phenomenon of the former in polar aprotic solvents and observed an unprecedented intermediate state with a bilayer structure. During the investigation of the stepwise and reversible expansion of a 2D metal-organic framework (MOF) in polar aprotic solvents, we discovered a unique bilayer intermediate state that has not been observed in other MOFs. More interestingly, exfoliation initiated from the intermediate and the fully expanded states led to the formation of double and single layer nanostructures, respectively, providing a new strategy for the selective preparation of ultrathin nanosheets from MOFs.

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。