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相关概念视频

Chirality02:25

Chirality

28.9K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
28.9K
Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Prochirality02:05

Prochirality

4.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.8K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

14.8K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
14.8K
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

3.1K
Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
3.1K
Fischer Projections02:18

Fischer Projections

16.1K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
16.1K

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相关实验视频

Updated: Jan 10, 2026

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

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奇拉性编码的分子波函数

T Georgiou1, J L Palma2, V Mujica3

  • 1Molecular Biology Interdepartmental Program (MBIDP), The Molecular Biology Institute, University of California, Los Angeles, 611 Charles E. Young Drive East, Los Angeles, California 90095-1570, USA.

The Journal of chemical physics
|November 24, 2025
PubMed
概括
此摘要是机器生成的。

旋转轨道合 (SOC) 在性分子中引入了内在相,从而实现了enantiospecific反应. 这些SOC诱导的相,通过平面波计算捕获,可以在实验中测量性材料.

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相关实验视频

Last Updated: Jan 10, 2026

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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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科学领域:

  • 量子化学 是一个量子化学.
  • 凝聚物质物理学 凝聚物质物理学
  • 频谱学是一种光谱学.

背景情况:

  • 异构体具有不可叠加的镜像结构.
  • 旋转轨道合 (SOC) 是一种影响电子属性的相对论效应.
  • 异构体的电荷密度在空间上得到反射,但由于SOC,被占用的旋转子可能会有所不同.

研究的目的:

  • 调查旋转轨道合 (SOC) 在产生因子特异性反应中的作用.
  • 在响应张量中建立一个对enantiospecific贡献的一般机制.
  • 为了将SOC驱动的旋转相与可测量的张量差异联系起来.

主要方法:

  • 从SOC诱导的阶段中理论推导enantios特定的贡献.
  • 在奇拉分子上的相对平面波密度函数计算.
  • 测量不变响应组合和张量属性的分析.

主要成果:

  • SOC编码了内在的相纹理,导致响应张量中的enantiospecific贡献.
  • 同位态的伪尺度特征来自于极轴合,而相同平价的合仍然是镜像平衡的.
  • 导出并验证了分析界限,将SOC阶段和振幅扭曲与可测量的张量差异联系起来.

结论:

  • SOC提供了一种在奇拉材料中对因子特异性反应的一般机制.
  • 平面波计算有效地捕捉了非定位的SOC相纹理.
  • 实验可以探测SOC诱导的阶段,以在奇拉样本中产生enantiospecific反应.