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相关概念视频

Prochirality02:05

Prochirality

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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...
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Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

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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...
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.3K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
7.3K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

16.3K
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...
16.3K
Stereoisomerism02:52

Stereoisomerism

14.5K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
14.5K
Naming Enantiomers02:21

Naming Enantiomers

27.6K
The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system essentially comprises three...
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相关实验视频

Updated: Mar 22, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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奇拉反氧活性等边三角形

Siva Krishna Mohan Nalluri1, Zhichang Liu1, Yilei Wu1

  • 1Department of Chemistry and ‡Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society
|April 13, 2016
PubMed
概括
此摘要是机器生成的。

研究人员从 pyromellitic diimide (PMDI) 和 naphthalene diimide (NDI) 单元中开发了刚性形三角形,用于储存能量. 这些材料具有独特的堆叠和电子共享,提高有机可充电离子电池的性能,增加了NDI含量.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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科学领域:

  • 材料科学
  • 有机化学
  • 电化学
  • 能量储存

背景情况:

  • 小分子有机氧化还原活性材料对于先进的储能应用至关重要.
  • 设计具有定制电子特性的新型分子架构是一个持续的挑战.
  • 之前的研究集中在具有相同氧化还原单位的等边三角形上.

研究的目的:

  • 合成和描述由非相同的 pyromellitic diimide (PMDI) 和 naphthalene diimide (NDI) 氧化还原单元组成的新型刚性等三角形.
  • 研究这些新材料的固态结构,电子特性和超分子组合.
  • 评估它们作为有机可充电离子电池中的电极活性材料的性能.

主要方法:

  • 使用NMR和单晶X射线衍射进行合成和表征.
  • 通过循环电压测量进行电化学分析.
  • 电子磁共振 (EPR) 和电子核双共振 (ENDOR) 光谱,由DFT计算支持.

主要成果:

  • 成功合成了两个具有C2对称性和三角镜形状的刚性等三角形.
  • 与等边三角形不同,这些等边三角形形成了特定的NDI-NDI和NDI-PMDI π-π堆叠的二元体.
  • 这些材料表现出可逆的多电子接受 (多达六个电子),未配对的电子被选择性地在NDI子单位之间共享.
  • 分子结构中的NDI含量增加与离子电池的电化学性能改善相关.

结论:

  • 基于PMDI和NDI的刚性等三角形是有机电池的有希望的氧化还原活性材料.
  • 分子设计,特别是NDI与PMDI单位的比率,显著影响固态包装和电化学性能.
  • 这些发现为开发下一代有机储能材料提供了有价值的结构-属性关系.