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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...
19.1K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

3.7K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
3.7K
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

18.9K
Molecular Orbital Energy Diagrams
18.9K
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

5.2K
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
5.2K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

931
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
931
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

4.1K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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相关实验视频

Updated: May 31, 2025

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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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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在基于二维胺的共价有机框架中的催化剂衍生层次结构.

Hao Guo1, Joseph P Cline2, Ryan Thorpe3

  • 1Dept. of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA 18015, USA. snyder@lehigh.edu.

Nanoscale
|January 23, 2025
PubMed
概括

这项研究引入了一种使用室温催化方法创建层级共价有机框架 (COF) 的新方法. 这种方法可以实现可调节的晶体生长和改善各种应用的扩散特性.

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 层次结构的多孔材料对于需要高效扩散的应用至关重要.
  • 控制晶体多孔材料的中层结构和形态仍然是一个重大挑战.
  • 目前的方法通常依赖于模板或结构指导分子,限制了简单的合成.

研究的目的:

  • 开发用于对晶体多孔材料进行层次结构的简单策略.
  • 为共价有机框架 (COF) 阐明合成-结构-功能关系.
  • 为了实现可调节的COF增长和独特的等级形态,没有二级模板.

主要方法:

  • 利用室温催化条件来调整COF的生长.
  • 使用三酸作为催化剂和增长修饰剂用于以胺为基础的COF.
  • 系统地绘制一个组成的伪相空间,以了解催化剂衍生的进化.

主要成果:

  • 通过三酸证明了终端胺的选择性定位,促进了异型晶体的生长.
  • 转换的球状COFs与微米以下的扩散长度成罗塞特结构.
  • 实现了相互连接,高面积比的晶体多孔板,减少了扩散长度尺度和增加了外部表面积.

结论:

  • 室温催化提供了一个简单的途径来控制COF中介结构和形态.
  • 三酸作为一种有效的生长修饰剂,使等级结构成为可能.
  • 开发的合成-结构-功能关系为设计具有增强性质的功能性COF提供了一条途径.