パラマグネティックCr-MIL-101内の開いた金属部位とのNドナー分子相互作用の探査:固体NMRスペクトルおよび密度関数理論の研究
Thomas Wittmann1, Arobendo Mondal2, Carsten B L Tschense1
1Inorganic Chemistry III, University of Bayreuth , Universitätsstraße 30, 95447 Bayreuth, Germany.
Journal of the American Chemical Society
|January 10, 2018
まとめ
研究者は,Cr-MIL-101の金属有機フレームワーク (MOF) の開いた金属部位に異なる分子がどのように結合するかを理解するために,高度なNMRスペクトロスコーピーとDFT計算を使用した. これは,MOFの設計に不可欠な特定の拘束的好みを明らかにします.
科学分野:
- 材料科学
- 固体化学
- スペクトロスコーピー
背景:
- メタル・オーガニック・フレームワーク (MOF) の性質を制御するには,ホスト・ゲストの相互作用を理解する必要があります.
- MOFの開いた金属部位は,ルイス基 अतिथिとの強い相互作用により,選択的吸収を示す.
研究 の 目的:
- Cr-MIL-101における水,アミノピリジン,およびダイエチラミンの間の相互作用を明らかにする.
- MOFの活動地でのこれらのゲストのための拘束力のある優先順位を確立します.
主な方法:
- 高解像度スペクトルのための超高速のマジック・アングル回転を用いたC MAS NMRスペクトロシーを使用した.
- 実験結果の検証に密度関数理論 (DFT) の計算を用いた.
- 適用されたスピン格子リラクゼーションと13C{1H} REDORスペクトル編集のスペクトル割り当て.
主要な成果:
- C MASのNMRスペクトルは,開かれた金属部位における各ゲスト分子の異なるシグネチャを提供した.
- 競争実験では,水 < ディエチラミン ≈ 2 - アミノピリジン < 3 - アミノピリジン の結合が好ましいことが判明した.
- Cr-MIL-101の誘導体の実験データに対するDFT計算によるNMRシフトを検証した.
結論:
- 組み合わせたNMRスペクトロスコーピーとDFT計算は,オープンな金属サイトでのゲストの配置を効果的に割り当て,決定します.
- NMRデータは,構造情報を補完して,ゲストとフレームワークのダイナミクスを洞察します.
- この戦略は,MOFにおけるアドソルベート混合物の研究に適用され,構造-特性関係の発展を助長する.
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