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関連する概念動画

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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関連する実験動画

Updated: Feb 17, 2026

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

Published on: September 18, 2016

12.1K

帯状の[20]コラーレンは,マルチモダルのフルレンの複合体のために,固体ではあるが適応可能な空洞を持つ.

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
まとめ
この要約は機械生成です。

[20]コラーレンは,C60やC70のようなフルレンを効果的に結合し,多用途の宿主-ゲスト化学を実証しています. この超分子複合化により,超高速の電荷分離が可能になり,高度な機能的材料への道が開けています.

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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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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

Published on: September 18, 2016

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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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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

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科学分野:

  • 超分子化学 超分子化学
  • 有機化学 オーガニック・ケミストリー
  • 材料科学 材料科学とは

背景:

  • コラーレンは,ユニークなベルト状の構造のため,有望な分子容器です.
  • コラーレン,特に[20]コラーレンの宿主-ゲスト化学は十分に研究されていない.
  • フラーレンは,超分子化学における重要なゲスト分子である.

研究 の 目的:

  • [20]コラーレンのマルチモダル複合化行動を様々なフルラーレンと研究する.
  • [20]コラーレン・フルラーレン複合体の結合親和性と構造的側面を特徴付けるために.
  • 充電分離などのアプリケーションにおけるこれらの複合体の潜在能力を探求する.

主な方法:

  • プロトン核磁気共鳴 (1H NMR) スペクトロスコピー
  • アイソテルミックタイトレーション熱計 (ITC)
  • 高解像度質量スペクトロメトリー (HRMS)
  • シングルクリスタルX線結晶学

主要な成果:

  • [20]コラーレンはC60およびC70フルレンとインクルージョン複合体を形成し,高い結合親和度 (Ka 10^5 M^-1まで) を有する.
  • その結果生じるホスト・ゲスト・コンプレックスは,超高速の電荷分離と安定した電荷分離状態を示す.
  • [20]コラーレンは,形状に適応する空洞を示し,異なる複合化モード (例えば,PC61BMと完全な封じ込め,DPC61Pyと溶媒-シネージ) を示しています.

結論:

  • [20]コラーレンは,多様な宿主-ゲスト複合に適した,固く,かつ適応性のある空洞を有しています.
  • この研究は, [20]collarene. guestの宿主-ゲスト化学を体系的に確立しています.
  • この発見は,コラーレンベースの超分子化学と機能的材料の開発のための基盤を提供します.