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相关概念视频

π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

1.8K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.8K
Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

8.3K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
8.3K
Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

10.8K
Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
10.8K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

12.7K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
12.7K
Nomenclature of Alkynes02:39

Nomenclature of Alkynes

18.5K
Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
18.5K

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相关实验视频

Updated: Jul 17, 2025

Spatial Separation of Molecular Conformers and Clusters
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量子干扰效应是否表现在带有定群的非循环阿里法分子中?

Ravinder Kumar1, Charu Seth2, Ravindra Venkatramani1

  • 1Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR), Mumbai 400005, India. ravi.venkatramani@tifr.res.in.

Nanoscale
|September 6, 2023
PubMed
概括

这项研究揭示了来自定群的量子干扰 (QI),而不仅仅是分子脊柱,如何控制单分子电子导电. 这些发现适用于简单的异质分子,并建议对分子电子学进行机械调.

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相关实验视频

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科学领域:

  • 分子电子学分子电子学
  • 量子干扰现象 量子干扰现象
  • 单分子器件是一种单分子器件.

背景情况:

  • 控制单分子电子导电对于分子电子应用,如绝缘,开关和能量转换至关重要.
  • 量子干扰 (QI) 效应通常通过改变分子结构或定群体位置来操纵.
  • 之前的研究主要集中在分子骨架的西格玛和/或π通道中的QI,通常在结合或循环系统中.

研究的目的:

  • 为了证明源自定组相互作用的QI效应可以用于设计单分子电子设备.
  • 为了证明QI可以在简单的非循环阿里法系统中被利用,扩展到超越联/循环结构.
  • 探索机械刺激的潜力,调整单个分子中的电荷传输特性.

主要方法:

  • 在单分子连接处研究量子干扰 (QI) 效应.
  • 分析了基乙醇,基胺和基基醇的电子传输光谱.
  • 识别了带隙状态共振和定群体敏感的QI现象.

主要成果:

  • 证明定组相互作用的QI效应可以控制单个分子中的电子导电.
  • 展示了QI在简单的非循环阿里法系统中的应用性.
  • 在传输光谱中确定了依赖链条长度和定组的共振.
  • 在定位在固组上的分子轨道之间观察到的QI.

结论:

  • 单分子电子设备可以根据定组相互作用的QI效应来设计.
  • 在简单的异质分子中,QI效应是可利用的,扩大了它们的应用范围.
  • 预测,机械刺激可以通过利用这些QI特征来调整断裂连接实验中的电荷传输特性.