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

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
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
2.2K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
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.
2.9K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
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...
2.7K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.3K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
9.3K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.6K
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.
2.6K
Photosystem II01:22

Photosystem II

78.2K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
78.2K

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

Red-light-excited dynamic near-infrared organic afterglow materials for in vivo bioimaging.

Light, science & applications·2026
Same author

Copper-Catalyzed Remote Asymmetric Three-Component Sulfonylation Using SO<sub>2</sub> as the Sulfur Source to Access Chiral Allylic Sulfones.

Organic letters·2026
Same author

Aromatic phosphonate-based luminophores: universal building blocks for ultralong room-temperature phosphorescence and multifunctional applications.

Chemical science·2026
Same author

Harmonizing High Phosphorescence Efficiency and Stretchability in Flexible Afterglow Materials Through Microphase Engineering.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Engineering Ultrahigh-Contrast Photoactivated Room-Temperature Phosphorescence With a Robust and Universal Ureido-Functionalized Siloxane Network.

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

Pseudo-Homologue Doping Strategy for Afterglow Materials.

Angewandte Chemie (International ed. in English)·2026

相关实验视频

Updated: Jan 9, 2026

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
07:28

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Published on: February 18, 2022

4.1K

光诱导的能量转移聚合.

Jian Liu1, Yaxiong Wei2, Liangwei Ma1

  • 1Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.

National science review
|December 10, 2025
PubMed
概括

这项研究引入了一种使用三重物种的新型光诱导聚合法,消除了对外部激素发起者的需求. 这种多功能能量转移策略为聚合反应中的单体作用提供了新的视角.

关键词:
光催化剂是一种光催化剂.聚合聚合的过程中.三倍三倍的能量转移.

更多相关视频

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
06:49

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

12.3K
Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
10:16

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

14.3K

相关实验视频

Last Updated: Jan 9, 2026

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
07:28

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Published on: February 18, 2022

4.1K
Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
06:49

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

12.3K
Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
10:16

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

14.3K

科学领域:

  • 聚合物化学 聚合物化学
  • 摄影化学的使用.
  • 有机合成 有机合成

背景情况:

  • 传统的光诱导聚合依赖于外源性基因物种.
  • 光学诱导的循环加法反应提供了替代机制.
  • 了解单体作用对于推进聚合化策略至关重要.

研究的目的:

  • 通过能量转移过程来研究光诱导的聚合.
  • 开发一种利用三重物种的新型聚合策略.
  • 探索单体在这种新方法中的作用.

主要方法:

  • 作为能量接受器,利用了低能量的,高度反应的烯分子三重物种.
  • 采用了受控实验和光谱方法 (例如,使用铁红作为模板).
  • 在光诱导聚合过程中研究了能量转移机制.

主要成果:

  • 开发了一种无外源活性成分的多功能光诱导聚合策略.
  • 证明三重物种,而不是传统的基因,是启动聚合的关键.
  • 展示了各种三重物种来源诱导聚合的能力.

结论:

  • 开发的战略为光诱导聚合提供了一条新的途径.
  • 三重物种在启动聚合过程中,与传统基因不同,起着至关重要的作用.
  • 这些发现促使进一步研究单体在光诱导聚合过程中的参与.