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相关概念视频

Collar Bearings01:23

Collar Bearings

1.7K
Collar bearings are essential in various machines designed to support axial loads on rotating shafts. Depending on the specific application and requirements, they can be found with single or multiple collars.
1.7K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.8K
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...
2.8K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

19.1K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
19.1K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

7.6K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
7.6K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

16.0K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
16.0K

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相关实验视频

Updated: Feb 17, 2026

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

12.1K

带状[20] 结合体具有固但适应性空腔,用于多模块合体复杂化.

Yifei Zhang1,2, Ting Liu1,2, Ke Liu3

  • 1State Key Laboratory of Soil Pollution Control and Safety, Stoddart Institute of Molecular Science, Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China.

Journal of the American Chemical Society
|February 16, 2026
PubMed
概括

[20]Collarene表现出多功能宿主-客化学,有效地结合了像C60和C70这样的富勒伦. 这种超分子复合使得超快的电荷分离成为可能,为先进的功能材料铺平了道路.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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相关实验视频

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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科学领域:

  • 超分子化学 超分子化学
  • 有机化学 有机化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 由于其独特的带状结构,collarenes是有前途的分子容器.
  • 聚烯的宿主-客人化学,特别是[20]聚烯,还没有得到充分的研究.
  • 富勒伦是超分子化学中的重要客分子.

研究的目的:

  • 为了研究[20]collarene与各种fullerenes的多式复合行为.
  • 描述[20]collarene-fullerene复合物的结合亲和和和结构方面.
  • 探索这些复合体在电荷分离等应用中的潜力.

主要方法:

  • 质子核磁共振 (1H NMR) 光谱学
  • 异热定位热量计 (ITC) 是一种热量计.
  • 高分辨率质谱仪 (HRMS) 是一种高分辨率的质谱仪.
  • 单晶X射线晶体学 单晶X射线晶体学

主要成果:

  • [20]Collarene与具有高结合亲和度 (Ka高达10^5M^-1) 的C60和C70富勒伦形成了包含综合体.
  • 由此产生的宿主-客体综合体表现出超快的电荷分离和稳定的电荷分离状态.
  • [20]Collarene具有可适应形状的腔体,显示不同的复杂化模式 (例如,与PC61BM完全封装,与DPC61Py溶剂协同作用).

结论:

  • [20]Collarene具有适合各种宿主-客人复杂化的刚性而又适应性空腔.
  • 这项研究系统地确定了[20]collarene.collarene的宿主-客人化学反应.
  • 这些发现为开发基于烯的超分子化学和功能材料提供了基础.