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

柔性多孔晶体中供体/受体排列的动态控制

• 批准号: 15F15339
• 负责人: 佐藤 弘志
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2015
• 资助国家: 日本
• 起止时间: 2015-11-09 至 2018-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15F15339/
• 关键词: 多孔体; 結晶; 構造変化; porous materials; metal-organic frameworks; radical; 細孔; 電荷移動

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.

二维（2D）材料的剥离，如石墨、层状过渡金属二硫族化物、层状双氢氧化物和层状氮化硼，已经被证明可以产生非凡的热电、催化或分离性能。另一方面，mof等层状多孔材料的相关研究相对较少。虽然自顶向下的方法已被用于剥离超薄膜的MOF纳米片，但仍然缺乏一种有效的方案来选择性地获得所需厚度和层数的纳米片。我们合成了两个二维Cu(II) kagome mof，探索了前者在极性非质子溶剂中独特的可逆膨胀现象，并观察到前所未有的双层结构中间态。在研究二维金属有机骨架（MOF）在极性非质子溶剂中的逐步可逆膨胀过程中，我们发现了一种在其他MOF中未观察到的独特的双层中间态。更有趣的是，从中间和完全膨胀状态开始的剥离分别导致双层和单层纳米结构的形成，为mof选择性制备超薄纳米片提供了新的策略。