ルイス酸誘導による内分子イオンペアリング状態の安定したダイラジカル形成
Jie Wang1, Haiyan Cui2, Huapeng Ruan1
1State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.
Journal of the American Chemical Society
|April 29, 2022
まとめ
研究者は,ドナー-受容体-ドナー分子とルイス酸を使用して,安定した交配型ダイラジカルを作成しました. この新しいルイス酸誘発アプローチは 独特のダイラジカル化合物を合成するための 新しい経路を開きます
科学分野:
- 有機化学
- 材料科学
- スペクトロスコーピー
背景:
- ドナー-受容体-ドナー (D-A-D) 分子は,材料科学における多用途な構成要素である.
- 新しい機能的材料の開発には 有機分子の電子状態の制御が不可欠です
- ルイス酸は有機化合物の電子特性と相互作用し,それを修正することができる.
研究 の 目的:
- 安定した交互結合ダイラジカルを合成する
- ダイラジカルの形成メカニズムを調査する
- 電子と幾何学的構造を特徴づける.
主な方法:
- シングルクリスタルX線 difraktion
- 電子パラマグネティック共振 (EPR) スペクトロスコーピー
- SQUID マグネトメトリ
- UV/Visスペクトロシー
- 密度関数理論 (DFT) の計算
主要な成果:
- 安定した交互結合のダイラジカルが成功裏に作られました.
- ダイラジカルには,オープンシェルのシングレット基底状態と,熱的にアクセス可能なトリプレート状態があります.
- ダイラジカルが分子内イオンペアとして記述できることを確認した.
- ルイス酸による分子内単一の電子移転を含むメカニズムが提案された.
結論:
- ルイス酸誘導を用いた中性,交互結合ダイラジカルを形成する新しい方法が確立された.
- この研究は,ダイラジカルの電子構造と性質に関する基本的な洞察を提供します.
- この研究は,材料科学における潜在的応用を持つ新種の根幹を作るための合成ツールボックスを拡張します.
関連する概念動画
Radical Formation: Addition
1.8K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.8K
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
Radical Formation: Overview
2.2K
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...
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...
2.2K
Radical Formation: Abstraction
3.7K
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...
Even though homolysis produces radicals, it is different from radical...
3.7K
Radical Reactivity: Intramolecular vs Intermolecular
1.8K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.8K
Radical Reactivity: Steric Effects
2.0K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
Along with electronic...
2.0K


