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関連する概念動画

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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 staggered...
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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 tetrahedral value,...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

Dipole Moment of a Molecule
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.

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関連する実験動画

Updated: May 16, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

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

Published on: February 7, 2017

メソモルフィック [2] ロタキサン: 相互接続したコンポーネントを持つイオンコアを遮断する.

Natalie D Suhan1, Stephen J Loeb, S Holger Eichhorn

  • 1Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, N9B 3P4, Canada.

Journal of the American Chemical Society
|December 11, 2012
PubMed
まとめ
この要約は機械生成です。

研究者らは,調節可能な性質を持つ液晶[2]ロタキサンを開発した. マクロサイクルでイオンコアを保護することで,熱的安定性と流動性が向上し,線形サイドチェーンはスメクティック・フェーズを促進し,枝分かれしたチェーンはソフト・クリスタル・フェーズを誘発した.

さらに関連する動画

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Interactive Molecular Model Assembly with 3D Printing
06:15

Interactive Molecular Model Assembly with 3D Printing

Published on: August 13, 2020

関連する実験動画

Last Updated: May 16, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

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

Published on: February 7, 2017

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Interactive Molecular Model Assembly with 3D Printing
06:15

Interactive Molecular Model Assembly with 3D Printing

Published on: August 13, 2020

科学分野:

  • マテリアルサイエンス 材料科学
  • 超分子化学 超分子化学
  • 液晶は,液体クリスタルです.

背景:

  • 液晶 [2]ロタキサンは,潜在的応用のある先進的な材料です.
  • テトラケネナーモチーフは,これらのロタキサン構造の基礎を形成します.
  • イオンコアは,分子特性に大きな影響を与えます.

研究 の 目的:

  • ディカチオンおよびテトラキオン液体結晶 [2]ロタキサンを合成し,特徴づけること.
  • メソモルフィズムと熱安定性に対するマクロサイクルシェルターの効果を調査する.
  • サイドチェーンアーキテクチャ (線形対分岐) と電荷密度が材料の行動に与える影響を調査する.

主な方法:

  • エステルとピリジニウムストッパーでテトラケチオンとディケチオン [2] ロタキサンを合成する.
  • ダンベル形のアナログとの比較分析.
  • 横鎖の長さや枝分かれが異なる (アリファティック vs シロキサン).
  • 熱分析 (DSC,TGA) で,メソフェーズ行動と安定性を決定する.

主要な成果:

  • [2] 線形サイドチェーンと特定のチェーンとコアの体積比を持つロタキサンは,スメクティック液晶相を示した.
  • サイドチェーンの比率の増加は,スメクティックA相の範囲を拡大したが,分解温度を超えた.
  • テトラケーション性から二ケーション性ロタキサンへの移行は,流動性,熱性,化学的安定性を改善しました.
  • 枝分かれしたサイドチェーンは柔らかい結晶相を誘導し,ロタキサン以外の類型は柔らかい結晶のみを示した.

結論:

  • マクロサイクルの誘発によるイオンコアシェルティングは,液晶 [2]ロタキサンにおけるメソモルフィズムと安定性に大きく影響する.
  • サイドチェーン構造と電荷密度は,液体結晶相の振る舞いを制御するために重要です.
  • [2]ロタキサンの設計は,特定の用途のために材料の性質を調整する経路を提供します.