Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.8K
The Photochemical Reaction Center01:29

The Photochemical Reaction Center

4.1K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
4.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Covalent Organic Framework Photocatalysts: Decoding Linkage Chemistry in Hydrogen Peroxide Synthesis From Air and Water.

Angewandte Chemie (International ed. in English)·2026
Same author

Non-fused ring A-D-A-type dyes for near-infrared II fluorescence imaging guided phototherapy and immune activation of tumour.

Biochemical and biophysical research communications·2026
Same author

Cobalt confined within nitrogen-doped porous carbon to enhance the redox kinetics and cycling stability of zinc-iodine batteries.

Chemical communications (Cambridge, England)·2026
Same author

Seven Models for Outer Surface-Only Functionalized Nanofluidic Systems.

ACS nano·2026
Same author

Acylhydrazone-Linked Covalent Organic Frameworks.

Journal of the American Chemical Society·2026
Same author

Single crystal covalent organic frameworks.

Chemical Society reviews·2026

相关实验视频

Updated: Jun 11, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

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

Published on: July 10, 2017

13.3K

用共价有机框架进行光催化.

Yongzhi Chen1, Donglin Jiang1

  • 1Department of Chemistry, Faulty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.

Accounts of chemical research
|October 7, 2024
PubMed
概括

设计先进的光催化剂需要一种系统的方法,而不仅仅是添加的改进. 共价有机框架 (COFs) 提供了一个分子设计的支架,用于增强光采集,电荷分离和光催化中的稳定性.

科学领域:

  • 材料科学 材料科学 材料科学
  • 光催化作用的光催化
  • 绿色化学 绿色化学

背景情况:

  • 光催化对于可持续的燃料和化学品生产至关重要,但设计高效,选择性和可重复使用的光催化剂仍然具有挑战性.
  • 现有的光催化剂在复杂的光化学反应,对催化场的精确控制,以及长期稳定性和可循环利用性方面扎.
  • 自然光合作用为有组织的光采集和催化过程提供了一个模型,激发了人工系统的发展.

研究的目的:

  • 审查分子设计和合成控制共价有机框架 (COF) 光催化剂的最新进展.
  • 突出COF策略,以改善光采集,电荷分离,载体运输和催化站点工程.
  • 讨论用于实际应用的基于COF的光催化剂的稳定性和可循环利用性的发展.

主要方法:

  • 对COF光催化剂的文献进行系统审查.
  • 对COF支架的分子设计原则的分析.
  • 对COF架构和功能进行合成控制的检查.

主要成果:

  • COFs为光催化剂的构建提供了一个分子预设计和合成可控制的平台.
  • 在定制COF以实现高效的光采集,电荷分离和大规模运输方面取得了重大进展.
  • 在COF中控制能量水平,催化空间和环境条件的策略提高了选择性和稳定性.

更多相关视频

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
10:13

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

Published on: April 28, 2023

2.3K
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

2.5K

相关实验视频

Last Updated: Jun 11, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

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

Published on: July 10, 2017

13.3K
A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
10:13

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

Published on: April 28, 2023

2.3K
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

2.5K

结论:

  • 氧化碳催化剂为设计多功能光催化剂所面临的挑战提供了一个有希望的解决方案.
  • 需要进一步的研究来解决COF光催化剂性能和可回收性方面的剩余问题.
  • 设计和合成的系统整合是释放光催化剂中COF的全部潜力的关键.