メタル・オーガニック・フレーム MFM-133 (M=Zr,Hf) の異常で調節可能な負の線形圧縮性
Yong Yan1, Alice E O'Connor2, Gopikkaa Kanthasamy2
1School of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , United Kingdom.
Journal of the American Chemical Society
|February 3, 2018
まとめ
MFM-133のような金属有機フレームワーク (MOF) は,圧力下での負の線形圧縮性 (NLC) を表しています. 研究者はこのNLC特性をフレームワーク内の金属イオン (Zr,Hf) を変えて調整した.
科学分野:
- 材料科学
- クリスタルグラフィー
- 化学について
背景:
- メタル・オーガニック・フレームワーク (MOF) は,多種多様な用途を持つ結晶状の多孔性材料です.
- ネガティブ・リニア・コンプレシビリティ (NLC) は,物質が液体圧下で1方向に収縮する珍しい現象である.
- MOFにおけるNLCの理解は,機械的な反応に合わせた材料の設計に不可欠です.
研究 の 目的:
- 同構造MOF,MFM-133 (Zr) とMFM-133 (Hf) の高圧構造的振る舞いを調査する.
- これらの材料における負の線形圧縮性 (NLC) のメカニズムを確認し,解明する.
- MOFの金属成分を変化させることで,NLCの調製性を証明する.
主な方法:
- 結晶構造を分析するために高圧単結晶X線微分法を使用した.
- 同構造MOF,MFM-133 (Zr) とMFM-133 (Hf) が合成され,TCHBリガンドが組み込まれました.
- NLCメカニズムを理解するために,圧縮下での構造変化を分析した.
主要な成果:
- MFM-133 ((Zr)) とMFM-133 ((Hf)) は,c軸に沿って負の線形圧縮性 (NLC) を表している.
- 3Dワインラックメカニズムは NLCを駆動し 圧力の下で八面形のケージの歪みを引き起こします
- MFM-133 ((Hf)) は,MFM-133 ((Zr)) に比べて,より高いレベルのNLCを示した.
結論:
- 同構造MOFのNLC特性は,金属イオン (Zr vs. Hf) を変化させることで効果的に調整できます.
- このチューニングは,フレームワークのトポロジーや全体的な構造を変更することなく達成されます.
- この研究は,制御可能な機械特性を持つMOFを設計するための新しい戦略を提供します.
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