メタル・オーガニック・フレームワークにおけるスコーピオネート型のメタロリガンドによる可逆性金属化と触媒化
Chenyue Sun1, Grigorii Skorupskii1, Jin-Hu Dou1
1Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States.
Journal of the American Chemical Society
|December 1, 2018
まとめ
研究者は,トリゾリルメタン (Tpm) リガンドを金属有機フレームワーク (MOF) に組み込むことに成功しました. これは,同質な触媒を模倣して,オレフィンサイクロプロパネーションのための孤立した触媒部位を作成します.
科学分野:
- 材料科学
- カタリシス
- 協調化学
背景:
- メタル・オーガニック・フレームワーク (MOF) は,異質な触媒のサイト隔離メタルセンターを可能にします.
- トリス (ピラゾリボラート) (Tp) とトリス (ピラゾリル) メタン (Tpm) は主要な同質な触媒リガンドですが,MOFでは使用されていません.
研究 の 目的:
- TpmリガンドをMOFに初めて組み込むこと.
- サイト隔離で調節可能な触媒センターでMOFを作成します.
- Tpm-MOFの触媒性能を評価する
主な方法:
- トリカルボキシル化されたTpmリガンドとZrOCl2を用いて新しいMOFを合成した.
- 場所でのメタリングと,Cu (I) とのMOFの脱メタリング/再メタリングを調査した.
- オレフィン・サイクロプロパネーションのためのMOFの構造,多孔性,および触媒的活性を特徴づけた.
主要な成果:
- 中立のスコーピオネートのようなケラティング部位を持つ新しいMOFが成功裏に生成されました.
- これらのサイトは,MOFの構造と多孔性を保ちながら,容易な脱金属化と再金属化を可能にしました.
- Cu (I) リメタライズされたMOFは,分子Tpm*触媒に匹敵する触媒活性を示した.
結論:
- TpまたはTpmのメタロリガンドをMOFに成功裏に組み込むことが初めて実証された.
- MOF内の孤立した,明確に定義された環境でTpm*触媒を固定するための方法を提供します.
- Tpm-MOFの高度な異質な触媒の可能性を強調しています.
関連する概念動画
02:51Metal-Ligand Bonds
24.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.3K
02:32Bonding in Metals
52.4K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.4K
02:37Metallic Solids
20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K
03:06Alkali Metals
24.6K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.6K
02:50Catalysis
30.5K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.5K
02:58Properties of Transition Metals
29.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.8K