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関連する概念動画

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.5K
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...
2.5K
Radical Formation: Overview01:03

Radical Formation: Overview

2.5K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.5K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

4.1K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
4.1K
Radical Formation: Abstraction00:47

Radical Formation: Abstraction

4.1K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
4.1K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.3K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.3K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

2.2K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
2.2K

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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

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水素移動誘発型ディラジカロイドシングレット分裂スイッチ

Qing Li1,2,3, Yu-He Kan1,2, Hong-Liang Xu1

  • 1Institute of Functional Material Chemistry, National and Local United Engineering Laboratory for Power Batteries, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China.

Journal of the American Chemical Society
|June 11, 2020
PubMed
まとめ
この要約は機械生成です。

テトラアザテラセンの水素タウトマーを用いて シングレット分裂 (SF) スイッチを設計した. この方法はダイラジカル性を高め,エネルギーレベルを下げ,電子機器のSF効率を120%以上予測します.

さらに関連する動画

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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Single-Molecule F&#246;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
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Single-Molecule Förster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1

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関連する実験動画

Last Updated: Dec 18, 2025

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Single-Molecule F&#246;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
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科学分野:

  • 理論化学
  • 材料科学
  • 太陽光発電

背景:

  • シングレット分裂 (Singlet fission,SF) は,高エネルギーシングレットエクシトンが2つの低エネルギートリプルエクシトンに分裂するプロセスである.
  • 効率的なSF材料の開発は,先進的な電子機器,特に太陽光発電において極めて重要です.
  • 水素タウトメリズムは有機分子における電子特性を調節するための潜在的な経路を提供します.

研究 の 目的:

  • 理論的に新型のシングレット分裂 (SF) 相互変換メカニズムを設計する.
  • SFベースの電子機器のスイッチとしてこれらのシステムの可能性を調査する.
  • 水素移行による効率的なSFを達成するための設計規則を確立する.

主な方法:

  • π電子結合戦略の理論的設計
  • ピラジンと融合したテトラアザテラセンの単一水素移動を利用する.
  • ダイラジカル性質と興奮状態のエネルギーレベル (S0とT1) を分析する.

主要な成果:

  • ダイラジカルな性質を導入するために,単一水素移行に基づく戦略が開発されました.
  • 効率的なSFに不可欠な低水準のE (T1) が達成された.
  • 計画されているテトラアザテン系では,SF効率が120%を超えると予想されている.
  • SF設計の指針として,水素の移動と電子の局所化とπ結合を結びつけました.

結論:

  • 提案された水素タウトメアの設計は,ディラジカロイドSFスイッチを作成するのに有効です.
  • 単一水素移動は,S0状態の局所電子とT1状態の広範なπ結合の鍵である.
  • この研究は,太陽光発電のアプリケーションのための将来のSF材料の設計に貴重な枠組みを提供します.