ウレア結合コヴァレンント有機フレームワーク
Chenfei Zhao1, Christian S Diercks1, Chenhui Zhu2
1Department of Chemistry , University of California-Berkeley ; Materials Sciences Division, Lawrence Berkeley National Laboratory; Kavli Energy NanoSciences Institute at Berkeley; Berkeley Global Science Institute, Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|November 16, 2018
まとめ
研究者は,柔軟な尿素結合を用いた新しい2D共性有機フレームワーク (COF) を開発した. これらのダイナミックなCOFは,可逆的な構造変化を示し,網状化学の可能性を拡大します.
科学分野:
- 材料科学
- 有機化学
- 超分子化学
背景:
- 協和有機フレームワーク (COF) は,調節可能な構造を持つ結晶性多孔ポリマーである.
- ガス貯蔵や触媒などの分野での COF の応用拡大には,新しい COF 結合の開発が不可欠です.
- 柔軟な結合は,COF材料に独特のダイナミックな性質を与えることができます.
研究 の 目的:
- 柔軟な尿素結合を組み込んだ新しい2DCOFを合成し,特徴づけること.
- ゲスト分子に対する反応として,これらの尿素結合COFのダイナミックな構造的振る舞いを調査する.
- 尿素結合の導入によって網状化学の拡張を証明する.
主な方法:
- 1,3,5-トリフォーミルフローログルシノール (TFP) と尿素ベースのモノマー (BDUまたはDMBDU) の間の凝縮反応.
- 合成されたCOF (COF-117およびCOF-118) の特徴づけは,粉末X線 difraktionおよびガス吸附のような技術を用いて行われます.
- ゲスト分子の挿入/除去時に逆転する構造的動態を観察する in-situ 研究
主要な成果:
- COF-117とCOF-118という2次元尿素結合COFの合成に成功しました.
- ゲスト分子に対する反転性層ダイナミクスの観察は,尿素C-N結合の回転と水素結合に起因する.
- COFでこれまで見たことのないダイナミックな構造的反応の実証
結論:
- この研究は,COF合成の範囲を広げ,尿素結合COFの最初の例を提示しています.
- 柔軟な尿素結合は ダイナミックな構造反応を可能にし 反応性のある材料への道を開きます
- これらの発見は,網状化学の進歩と機能的な多孔性の材料の設計に寄与します.
関連する概念動画
02:04Covalently Linked Protein Regulators
9.6K
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....
9.6K
02:04Covalently Linked Protein Regulators
2.0K
2.0K
01:29Covalent Bonds
162.3K
Overview
162.3K
01:08Covalent Bonds
11.0K
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,...
11.0K
02:18Network Covalent Solids
16.2K
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...
16.2K
02:46Covalent Bonding and Lewis Structures
61.3K
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.
61.3K