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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.8K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.3K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.3K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.2K
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...
12.2K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

8.7K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
8.7K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.4K
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...
14.4K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.7K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
2.7K

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Updated: Jun 12, 2025

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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水素結合C3対称ヘクサデヒドロトリベンゾ[12]アヌレンの多形性

Yotaro Kasahara1, Takashi Takeda1,2,3, Shun Dekura1,2

  • 1Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.

Journal of the American Chemical Society
|May 25, 2025
PubMed
まとめ

C3対称ヘクサデヒドロトリベンゾ[12]アヌレンの誘導体は,水素結合に基づくラメラー構造またはナノファイバー構造に自己組み立てられる. これらの構造は異なるダイナミクス,光学特性,相変化を示し,ポリモルフィックな振る舞いを示しています.

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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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科学分野:

  • 超分子化学
  • 材料科学
  • 有機化学

背景:

  • 水素結合能力を持つC3対称な分子は自己組み立てに興味があります.
  • 機能的な材料の設計には 分子組成の制御が不可欠です

研究 の 目的:

  • C3対称ヘクサデヒドロトリベンゾ[12]アヌレンの自己組み立て行動を調査する.
  • 異なる分子組成の形成に対する水素結合の影響を理解する.
  • 形成された構造の性質と相変遷を特徴付ける.

主な方法:

  • C3対称ヘクサデヒドロトリベンゾ[12]アヌレンの合成
  • 自己組み立てを観察するための溶液相試験
  • スペクトル分析 (吸収スペクトル)
  • フェーズトランジションを研究するための熱分析

主要な成果:

  • 導出物は2Dのラメラー (LM) または1Dのナノファイバー (NF) アセンブリを形成した.
  • LM と NF 構造の間の分子間アミド結合モードは異なっていた.
  • NFの構造は LMの構造よりも不安定でした
  • CHCl3における1D関連は,CH3CNによって抑制された同位体モデルに従った.
  • NF構造はより高いダイナミクスを示し,加熱時にLMへの相移行を経験しました.
  • NFと固体 LMの異なる光学特性が観察されました.
  • 多形現象は,結合された水素結合とヴァン・ダー・ワールスの相互作用から生じた.

結論:

  • C3対称な分子は,多形構造に制御可能な自己組み立てを示します.
  • 水素結合は,組み立てモードと安定性を決定する上で重要な役割を果たします.
  • 分子間の力の相互作用により 異なる性質を持つ多様な分子構造が生まれます