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関連する概念動画

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.2K
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...
3.2K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.2K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.2K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.1K
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...
3.1K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.0K
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...
2.0K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.2K
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...
1.2K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K

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関連する実験動画

Updated: Oct 17, 2025

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

11.7K

アロマティック・スタッキング・メディアド・スピン・カップリング・イン・サイクロファン・アセンブリド・ディラジカル

Han Han1, Di Zhang1, Ziqi Zhu1

  • 1Beijing National Laboratory for Molecular Sciences, Center for the Soft Matter Science and Engineering, the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China.

Journal of the American Chemical Society
|October 12, 2021
PubMed
まとめ
この要約は機械生成です。

この研究は,パラサイクロファンが結合したラジカルで対面するπ-πの積み重ねが,反鉄磁気結合を促進することを明らかにしています. 調節可能なスピン相互作用を持つ 安定した有機根性物質の設計に 洞察力を提供します

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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関連する実験動画

Last Updated: Oct 17, 2025

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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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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

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

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科学分野:

  • 有機化学
  • 材料科学
  • 量子化学について

背景:

  • オーガニックラジカルにおける スピン・スピン・カップリングの理解は 先進的な材料の開発に不可欠です
  • 磁気相互作用を媒介する π-π スタッキングの役割は,依然として活発な研究分野である.

研究 の 目的:

  • ダイラジカル系におけるスピン・スピン結合に対する π-π スタッキングモチーフの影響を調査する.
  • [2.2]パラサイクロファン (CP) ユニットを基に新しいディラジカルを設計し合成する.

主な方法:

  • CPで結ばれたフッ素基分子を特徴とする地域同位体ダイラジカル合成.
  • 実験データと単結晶X線微分を用いた磁気結合の分析.
  • 磁気相互作用の構造的基礎を解明するための計算研究.

主要な成果:

  • 部分的に積み重ねられたフッ素単位を持つディラジカルは強い反鉄磁気 (AFM) カップリングを示した.
  • シングレット基底状態による良好な空気安定性で,高いダイラジカル指数 (0. 8 と 0. 9) が観察されました.
  • 擬似メタ配列のフェニレン環を対面に積み重ねることで,軌道相互作用によってAFM結合が促進された.

結論:

  • パラサイクロファンが結合したポリサイクル芳香炭化水素の対面 π フレームワークはAFM カップリングを好みます.
  • 空間間相互作用はフェロマグネティック (FM) カップリングにつながるが,極性ラジカルが少ない場合は弱くなる.
  • この研究は,分子設計とスタッキングを通じて制御された磁気特性を有する有機物質を設計するための枠組みを提供します.