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

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.4K
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...
2.4K
Radical Formation: Overview01:03

Radical Formation: Overview

2.4K
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...
2.4K
Valence Bond Theory02:42

Valence Bond Theory

10.2K
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...
10.2K
Radical Formation: Addition00:47

Radical Formation: Addition

2.0K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
2.0K
Colors and Magnetism03:02

Colors and Magnetism

12.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.9K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.2K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
2.2K

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

Biomimetic all-metal Pd<sub>11</sub> helicene.

Science advances·2026
Same author

Cycloparaphenylene-Derived Porous Organic Cylinders.

Journal of the American Chemical Society·2026
Same author

Atomic-scale mechanism of anisotropic ion migration in 2D Bi<sub>2</sub>O<sub>2</sub>Se nanodevices.

Nature communications·2026
Same author

Ligand-regulated copper nanoclusters: atomic-precision synthesis, structural evolution, and catalytic function in photo- and electrocatalysis.

Chemical Society reviews·2026
Same author

Molecular Boron-Phosphides: From Stable Monomers to Aromaticity-Tunable Smallest Neutral Metallacycles.

Inorganic chemistry·2026
Same author

Anion-Directed Assembly of Atomically Precise Silver Nanofibers: Tunable Inner Diameters and Mechanical Exfoliation into Subnanometer Nanofibers.

Journal of the American Chemical Society·2026

相关实验视频

Updated: Nov 24, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

3.1K

具有可控制的旋转-旋转相互作用的TEMPO激进-功能化超分子协调复合体

Wei-Ling Jiang1, Zhiyong Peng1, Bin Huang1

  • 1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China.

Journal of the American Chemical Society
|December 28, 2020
PubMed
概括

研究人员精确地控制了基质功能化的金属循环和子中的旋转. 他们观察到明显的旋转-旋转相互作用,金属循环3显示出由于近距离的强度,并证明了固态中可切换的零场分裂.

更多相关视频

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

19.1K
Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
11:19

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

Published on: July 4, 2016

10.9K

相关实验视频

Last Updated: Nov 24, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

3.1K
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

19.1K
Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
11:19

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

Published on: July 4, 2016

10.9K

科学领域:

  • 超分子化学
  • 激进化学
  • 材料科学

背景情况:

  • 在超分子激素化学中,非共价旋转相互作用至关重要.
  • 控制旋转数,位置和距离是设计新型旋转材料的关键.
  • 了解这些相互作用有助于开发先进的功能材料.

研究的目的:

  • 在TEMPO功能化的金属循环和中构建和研究旋转-旋转相互作用.
  • 通过协调驱动的自组装精确控制旋转环境.
  • 探索分子结构和固态包装对自旋相互作用的影响.

主要方法:

  • 以协调驱动的自组装来合成TEMPO功能化的金属循环 (1-4) 和金属 (5-6).
  • 电子磁共振 (EPR) 光谱用于研究旋转互动.
  • 进行X射线晶体学以阐明分子结构和固态结构.
  • 机械研磨和溶剂蒸汽刺激以诱导晶体变形.

主要成果:

  • 在金属循环和中实现了精确控制的旋转安排.
  • 由于旋转距离较短,金属循环3在溶液中呈现出更强的旋转-旋转相互作用.
  • 在固态中观察到显著的旋转-旋转 (双极-双极) 相互作用和大量的零场分裂 (ZFS),特别是在金属循环4中 (D=17.5mT).
  • 在金属循环4及其模拟4a中通过晶体变异实现了ZFS的可逆切换.

结论:

  • 这项研究表明,在金属超分子组合中精确控制了分子间和分子内部的旋转-旋转相互作用.
  • 结构修改和固态包装显著影响旋转相互作用强度和ZFS.
  • ZFS的可逆切换为开发可切换的有机旋转材料开辟了道路.