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

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

666
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
666
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.9K
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...
1.9K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.0K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.0K
π Molecular Orbitals of the Allyl Radical01:27

π Molecular Orbitals of the Allyl Radical

3.4K
Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π electrons....
3.4K
Newman Projections02:06

Newman Projections

16.8K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
16.8K
Molecular Orbital Theory I02:35

Molecular Orbital Theory I

32.1K
Overview of Molecular Orbital Theory
32.1K

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

Protocol for longitudinal two-photon calcium imaging and holographic optogenetic manipulation to investigate memory in mice.

STAR protocols·2026
Same author

Trefoil polymers from a knotted synthon.

Nature chemistry·2026
Same author

Bending-Induced Vibrational Landscape Reorganization Governs Energy Dissipation in Perylene Bisimides.

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

Electron-injection-induced global aromaticity enables stable open-shell nanopillars with intense mid-infrared magnetic circular dichroism.

Chemical science·2026
Same author

Redox- and protonation-driven Baird and Clar aromaticity in asymmetric multicyclic octaphyrins.

Chemical science·2026
Same author

Beclin-1/LC3B regulation of podocyte autophagy in IgA nephropathy via PI3K/AKT signaling.

Journal of nephrology·2026
Same journal

Enhanced and selective oxygen reduction by iron porphyrin with a biguanide residue in the second coordination sphere.

Chemical science·2026
Same journal

Excited-state orbital angular momentum enables all-optical molecular spin coherence.

Chemical science·2026
Same journal

Polyvinyl-based hole-transporting materials processed with non-destructive and green solvents for tin-lead perovskite solar cells and all-perovskite tandems.

Chemical science·2026
Same journal

Pd-catalyzed regio- and enantioselective allylation of cyclic allylboronates.

Chemical science·2026
Same journal

Covalent polyoxometalate-polyimide hybridization: multi-scale molecular engineering toward high-performance sodium-ion battery anodes.

Chemical science·2026
Same journal

Catalytic visible light-driven alkane dehydrogenation by a di-uranyl germanotungstate.

Chemical science·2026
查看所有相关文章

相关实验视频

Updated: Jun 28, 2025

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

18.6K

在溶液中的二维辐射π堆.

Feng Su1, Yongseok Hong2, Guilan Zhang1

  • 1Department of Chemistry, College of Chemistry and Chemical Engineering, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, Xiamen University Xiamen 361005 P. R. China.

Chemical science
|April 19, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用 [4]cyclo-naphthodithiophene diimide分子创建了新的单层二维 (2D) 辐射π堆. 这些二维材料具有独特的特性,包括模板C60吸收和高效的能量传输.

更多相关视频

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

15.4K
Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA
08:17

Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA

Published on: July 9, 2021

4.7K

相关实验视频

Last Updated: Jun 28, 2025

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

18.6K
Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

15.4K
Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA
08:17

Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA

Published on: July 9, 2021

4.7K

科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 有机电子 有机电子

背景情况:

  • 组织的π-聚合物架构显著影响电子合和光物理行为.
  • 二维 (2D) 材料因其独特的电子和光学特性而受到越来越多的关注.
  • 2D π-stack 承诺先进的拓属性,但由于弱 π-π 相互作用而面临合成挑战.

研究的目的:

  • 开发一种在溶液中合成单层2D辐射π堆的方法.
  • 调查这些新型二维 π 堆的特性和潜在应用.
  • 探索使用这些结构作为客分子复合的模板.

主要方法:

  • 合成柱状的辐射 π 结合 [4] 环-纳夫托迪提奥芬二胺化物 ([4]C-NDTI) 分子.
  • 通过平面内分子间 π-π 相互作用的 [4]C-NDTI 的四边形排列,形成单层的 2D π 堆.
  • 2D π-stack 拓和光物理特性的表征.

主要成果:

  • 在溶液中成功制备单层2D辐射π堆.
  • 展示一个独特的2D拓,与传统的1Dπ堆不同.
  • 观察 [4]C-NDTI 2D π堆作为C60吸收的模板,形成 [4]C-NDTI-C60复合体.
  • 在二维平面上出现了快速的激子移位和高效的激发能量道的证据.

结论:

  • 这项研究在合成二维辐射π堆方面取得了突破,克服了以前的局限性.
  • 这些二维π堆的独特拓和电子特性为材料设计开辟了新的途径.
  • 这些材料在宿主-客人化学和能量传输系统中的应用方面表现有前途.