多孔の結晶オレフィン結合コバルント有機フレームワーク
Hao Lyu1, Christian S Diercks1, Chenhui Zhu2
1Department of Chemistry , University of California-Berkeley ; Materials Sciences Division, Lawrence Berkeley National Laboratory; and Kavli Energy NanoSciences Institute, Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|April 25, 2019
まとめ
研究者はCOF-701を開発し,最初の非置換オレフィン結合の共性有機構造を作りました. この頑丈な材料は,毛穴性を示し,ルイス酸を固定した後も触媒的活動を保持し,化学的用途に希望を示しています.
科学分野:
- 材料科学
- 有機化学
- カタリシス
背景:
- 協和有機フレームワーク (COF) は,様々な用途で調整可能な性質を提供します.
- 先進的な材料設計には,特定のリンクを持つ堅固なCOFの開発が不可欠です.
- 代替されていないオレフィン結合は,安定性を高めるためのユニークな構造モチーフを提示します.
研究 の 目的:
- 最初の非置換オレフィン結合共価有機構造 (COF-701) を合成し,特徴づけること.
- 新しいCOFの化学的強度と多孔性を評価する.
- ルイス酸を固定することによって,COFの触媒的可能性を実証する.
主な方法:
- 2,4,6-トリメチル-1,3,5-トリアジン (TMT) と4,4'-ビフェニル二カルバルデヒド (BPDA) のアルドール凝縮反応
- 構造確認のためのフーリエ変換赤外線 (FT-IR) スペクトロスコーピーと固体13Cクロスポラライゼーションマジックアングルスピニング (CP-MAS) NMRスペクトロスコーピー.
- 酸性および塩基性条件下での多孔性測定と化学安定性試験
- ボロン三酸エーテル酸 (BF3·OEt2) の不動化とダイエルス・アルダー反応における触媒試験.
主要な成果:
- 代替されていないオレフィン結合 (-CH=CH-) を有するCOF-701の合成に成功.
- COF-701は高孔度 (1715 m2 g-1) と強い酸性および塩基性環境における特殊な化学的強度を示しています.
- COF-701内の固定されたBF3·OEt2 (BF3COF-701) は,基準のディエルス-アルダー反応で触媒活性を維持した.
結論:
- COF-701は,オレフィン結合の非置換COFとして,重要な進歩を示しています.
- オレフィン結合の固有の安定性は,フレームワークに顕著な化学的強度を与える.
- BF3COF-701の多孔構造と保持された触媒活動は,再利用可能な異質な触媒としての可能性を強調しています.
関連する概念動画
02:04Covalently Linked Protein Regulators
8.9K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
8.9K
02:04Covalently Linked Protein Regulators
2.0K
2.0K
02:18Network Covalent Solids
16.1K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.1K
01:29Covalent Bonds
160.8K
Overview
160.8K
01:08Covalent Bonds
10.2K
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
10.2K
02:46Covalent Bonding and Lewis Structures
60.9K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
60.9K