ヘテロゲネスな触媒のための堅固な水素結合の有機枠組の合成後の金属化
Bin Han1, Hailong Wang1, Chiming Wang1
1Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry , University of Science and Technology Beijing , Beijing 100083 , China.
Journal of the American Chemical Society
|May 24, 2019
まとめ
研究者はスズキ-ミヤウラ結合のための堅固な水素結合有機フレームワーク (HOF) 触媒HOF-19を開発した. この安定したHOF触媒は優れた性能を示し,無効化後に容易に再生できます.
科学分野:
- 材料科学
- カタリシス
- 超分子化学
背景:
- 水素結合有機フレームワーク (HOF) は,潜在的触媒用途を持つ新材料です.
- しかし,触媒としての広範な使用は,安定性が低いため制限されています.
研究 の 目的:
- 触媒用途の頑丈なHOF材料を合成する.
- スズキ・ミヤウラコップルのパラジウム含有HOFの触媒性能を調査する.
主な方法:
- 新しい多孔性HOF (HOF-19) は,ヒドロゲン結合とπ-π相互作用を介してアミノ置換 bis ((tetraoxacalix[2]arene[2]triazine) を使用して合成されました.
- パラジウムアセテートによるHOF-19の合成後のメタリング.
- スズキ・ミヤウラ結合反応における結果のパラジウムII触媒の評価
主要な成果:
- HOF-19は,高いブルナウアー-エメット-テラー表面積 (685 m2 g−1) を示した.
- パラジウムII/HOF-19触媒は,高分離率 (96-98%) と優れた選択性で,スズキ-ミヤウラ結合において優れた性能を示した.
- 触媒は顕著な安定性と再利用性を示し,活性度は単純再結晶化によって46%から92%に回復した.
結論:
- 頑丈で安定したHOFベースの触媒が開発されました.
- パラジアムII/HOF-19触媒は,効率的でリサイクル可能なスズキ・ミヤウラ結合に重要な可能性を秘めている.
- この研究は,異質な触媒におけるHOFの有望さを強調しています.
関連する概念動画
Catalysis
30.2K
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.
30.2K
Hydrogen Bonds
131.9K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
131.9K
Hydrogen Bonds
13.5K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
13.5K
Bonding in Metals
52.2K
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”.
52.2K
Metal-Ligand Bonds
24.1K
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...
24.1K
IR Spectrum Peak Broadening: Hydrogen Bonding
1.8K
The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
1.8K


