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

Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

4.6K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
4.6K
Radical Formation: Overview01:03

Radical Formation: Overview

1.9K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
1.9K
Radical Formation: Elimination00:51

Radical Formation: Elimination

1.6K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
1.6K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

1.7K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
1.7K
Radical Autoxidation01:20

Radical Autoxidation

2.5K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.5K

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

Molecular design strategy for solution-phase magneto-chiral photochemistry.

Chemical communications (Cambridge, England)·2026
Same author

Lamellar-Cleavage-Induced Triboluminescence in Discrete Chiral Complexes with Lanthanides.

Chemistry (Weinheim an der Bergstrasse, Germany)·2025
Same author

Correction: Spiral Eu(III) coordination polymers with circularly polarized luminescence.

Chemical communications (Cambridge, England)·2025
Same author

Engineering cofacial porphyrin dimers using lacunary polyoxotungstates.

Chemical science·2025
Same author

Antimicrobial use in Japanese hospitals: results from a point-prevalence survey in Aichi, 2020.

The Journal of hospital infection·2025
Same author

An aromatic layered foldamer based on a (<i>cis</i>, <i>cis</i>)-squaramide: chiral induction and absolute structure.

Organic & biomolecular chemistry·2025

相关实验视频

Updated: May 1, 2026

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
13:21

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps

Published on: August 18, 2012

18.0K

使用氧激素控制单片氧 (1Delta g) 产生的概念:酸与氧激素有共性联系.

Kazuyuki Ishii1, Shoji Takeuchi, Shinsuke Shimizu

  • 1Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.

Journal of the American Chemical Society
|February 20, 2004
PubMed
概括

研究人员通过将phthalocyaninatosilicon (SiPc) 与氧化物基 (NRs) 联系起来,增强了单一氧气 ((1) Delta ((g)) 的产生. 这种不寻常的方法通过电子交换相互作用增加光化学产量,提高单点氧量子产量 (Phi).

更多相关视频

Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase
10:14

Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase

Published on: November 8, 2019

5.7K
Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
08:23

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

4.4K

相关实验视频

Last Updated: May 1, 2026

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps
13:21

Detection of Nitric Oxide and Superoxide Radical Anion by Electron Paramagnetic Resonance Spectroscopy from Cells using Spin Traps

Published on: August 18, 2012

18.0K
Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase
10:14

Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase

Published on: November 8, 2019

5.7K
Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds
08:23

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

4.4K

科学领域:

  • 摄影化学的使用.
  • 超分子化学 超分子化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 单点氧生成对于光动力学疗法和化学合成至关重要.
  • 酸酸 (SiPc) 衍生物是众所周知的光敏化剂.
  • 超磁性物种通常会灭激发状态,减少光化学产量.

研究的目的:

  • 通过使用与氧激素 (NR) 相关的SiPc来研究单点氧生成的机制.
  • 探索电子交换相互作用与NRs对单点氧量子产量的影响 (Phi(Delta)).
  • 了解如何连接NRs影响三倍量子产量和激发状态寿命.

主要方法:

  • 聚氨酸 (SiPc) 与氧化物基 (NRs) 的共价连接.
  • 谱分析以确定三倍量子产量和激发状态寿命.
  • 分析旋转选择性能量转移速率的理论计算.

主要成果:

  • 通过将NR与SiPc联系,成功地增加了单个氧量子产量 (Phi(Delta)) .
  • 观察到量子产量增加三倍,激发状态寿命延长.
  • 通过与偏磁性NR的电子交换相互作用,证明了光化学反应产量的异常增强.
  • 确认旋转选择性能量传递速率常数不受NR连接的影响.

结论:

  • 将NR与SiPc连接提供了一种新的策略,以增强单片氧生成.
  • 观察到的Phi ((Delta) 的增加归因于改善了三重状态的利用率.
  • 这项研究提供了通过对磁性物种的电子交换相互作用来增强光化学产量的罕见例子.