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相关概念视频

Structural Isomerism02:34

Structural Isomerism

19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K
Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

Directing and Steric Effects in Disubstituted Benzene Derivatives

3.0K
When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
3.0K
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

10.3K
The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
10.3K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.3K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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相关实验视频

Updated: Jun 16, 2025

Synthesis and Characterization of Functionalized Metal-organic Frameworks
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通过硬体相互作用驱动的链接器设计,增强共价有机框架中的结构控制.

Alena Winter1, Farzad Hamdi2,3, Andreas Eichhöfer4

  • 1Institute of Chemistry, Faculty of Natural Sciences II, Martin-Luther-Universität Halle-Wittenberg Halle/Saale Germany frederik.haase@chemie.uni-halle.de.

Chemical science
|August 21, 2024
PubMed
概括

研究人员开发了一种新的链接器设计策略,专门合成kagome (kgm) 协价有机框架 (COF). 庞大的功能组诱导固体相互作用,控制COF结构并扩大合成可能性.

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 协价有机框架 (COF) 是具有可调节性质的晶体多孔材料.
  • 卡戈梅 (kgm) COF 具有独特的孔隙结构,但难以选择性合成.
  • 多态性,特别是正方形格子 (sql) 结构的形成,使目标kgm合成复杂化.

研究的目的:

  • 开发一种可靠的合成方法,专门针对kgm COF结构.
  • 为了研究链接器设计和固体相互作用在控制COF多态化中的作用.
  • 了解kgm COFs的形成机制及其孔状特征.

主要方法:

  • 设计的COF连接器与重的功能组 (甲基酸盐) 诱导硬质障碍.
  • 利用不同长度的互补双酸线性链接剂 (二胺和西丁) 来调整固态相互作用.
  • 采用结构分析技术来描述由此产生的COF格子和孔状结构.

主要成果:

  • 通过在四牙连接器上使用重的功能组,成功合成了kgm COFs.
  • 证明较短的链接剂 (二胺) 促进了硬质障碍和kgm形成,而较长的链接剂 (二) 减少了障碍,有利于sql形成.
  • 在kgm COF中观察到不寻常的ABC堆叠,导致珍珠串状毛孔而不是两个不同的毛孔大小.

结论:

  • 立体交互驱动的链接器设计提供了对COF网络拓和多态的有效控制.
  • 该战略扩大了设计工具箱,用于创建特定的COF结构.
  • 该研究提供了关于COF网络形成和多形态的基本原则的宝贵见解.