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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.1K
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...
3.1K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

4.4K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
4.4K
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

10.2K
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
10.2K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.3K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.3K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.0K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
3.0K
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

6.5K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
6.5K

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Updated: Sep 25, 2025

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core

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3,6-カルバゾイレンオクタフィリン (1.0.0.1.0.0) とそのBis-BF2複合体

Hao Chen1,2, Xusheng Shi3, Yipeng Lun3

  • 1Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, P. R. China.

Journal of the American Chemical Society
|April 28, 2022
PubMed
まとめ
この要約は機械生成です。

研究者らは,カルバゾール前駆者を用いて新しいオクタフィリンマクロサイクルを合成した. これらの分子は,トリフオロアセテート (TFA) またはBF2で改変されると,有機レーザー染料としての潜在性を示すユニークな光物理的特性を示す.

さらに関連する動画

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

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科学分野:

  • 有機化学
  • 材料科学
  • フォト物理学

背景:

  • 拡張ポルフィリンは,調整可能な電子および光学特性を有するマクロサイクル化合物のクラスです.
  • カーバゾール誘導体は複雑な有機分子を作るための多用途のプラットフォームを提供します.
  • マクロサイクルの電子構造を調節することは,高度な機能材料の開発の鍵です.

研究 の 目的:

  • カルバゾール単位を組み込んだ新しいオクタフィリンマクロサイクルを合成する.
  • 三酸塩 (TFA) プロトネーションとBF2複合がコンフォームと電子構造に及ぼす影響を調査する.
  • これらの改造されたマクロサイクル,特にレーザー染料の光物理的性質と潜在的な応用を評価する.

主な方法:

  • 3,6-カルバゾール単位に基づくオクタフィリン前駆体合成
  • 三酸 (TFA) を用いて二プロトン化種 (2-2TFA) を形成する.
  • BF2と複合し,bis-BF2-ケラート複合体 (2-2BF) を形成する.

主要な成果:

  • 二プロトン化種 (2-2TFA) は800 nmまで強烈なパンクローム吸収を示した.
  • ビス-BF2ケラート複合体 (2-2BF) は,強い可視吸収 (ε535nm = 2.1 × 10^5 M^-1 cm^-1) と大きなストークスシフトで640 nmで赤にシフトした放射を示した.
  • 2-2BF複合体は,光学ポンプで高品質の有機マイクロレーザーを構築するのに成功しました.

結論:

  • TFA プロトネーションとBF2 コンプレクセーションによるオクタフィリンの改変は,それらの電子的および光物理的性質を効果的に調節する.
  • その結果生じるマクロサイクリック複合体は,光電子アプリケーションに有望な特性を示しています.
  • 2-2BF複合体で示される拡張ポルフィリンは,有機マイクロレーザーの効率的なレーザー染料として重要な可能性を秘めている.