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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
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...
3.6K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.1K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.1K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.9K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
47.9K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.3K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

15.1K
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...
15.1K

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Updated: Jan 6, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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2Dテッセラションを設計するために,ポリケーション性サイクロファンの内部および分子間電荷移転を組み合わせる

M Mustafa Cetin, Yassine Beldjoudi, Indranil Roy

  • 1Joint Center of Excellence in Integrated Nanosystems , King Abdulaziz City for Science and Technology , Riyadh 11442 , Kingdom of Saudi Arabia.

Journal of the American Chemical Society
|October 4, 2019
PubMed
まとめ

新しいドナー・アクセプター・サイクロファンは,光誘発の電荷移転を示し,様々な2Dとチューブ状の上部構造に自己組み立てます. これらの材料は電子輸送とマルチレスポンシブアプリケーションの可能性を示しています.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

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科学分野:

  • 超分子化学
  • 材料科学
  • オーガニック電子

背景:

  • ドナー-受容体 (D-A) サイクロファンは,高度な機能材料の開発に不可欠です.
  • 材料の設計には自己組み立てと 充電伝送の性質を制御することが重要です
  • ナフタレンとバイオレンユニットは,調整可能な電子と構造特性を提供します.

研究 の 目的:

  • 新しいD-Aナフタレン-バイオゲンベースのサイクロファンを合成し,特徴づけること.
  • 光誘導電荷移転 (CT) の性質と形状の変化を調査する.
  • 2次元とチューブ状の上部構造と潜在的応用を探求する.

主な方法:

  • 様々なD-Aサイクロファンの形状と対称性の合成と特徴付け
  • 溶液光学研究で,光誘導内分子CTと放射を分析する.
  • テトラチアフルワレン (TTF) と共結晶化して複雑な上層構造を形成する.

主要な成果:

  • 465 nmで観測された光誘導内分子CTは,540 nmで放出する.
  • 箱形と六角形のサイクロファンは2Dの正方形,ハネコム,六角形のタイルパターンに自己組み立てます.
  • TTFとの共結晶は,二重の内および分子間CT行動を持つ管状の上部構造を生成する.

結論:

  • D-Aサイクロファンは,上部構造形成と電子特性に対する正確な制御を提供します.
  • 合成された材料は有望なパラマグネティックとマルチレスポンシブ特性を持っています.
  • これらの発見は,電子輸送アプリケーションのための新しい材料の開発の道を開く.