種子ポリメリゼーションのための折り畳みとルイス酸塩複合法に基づくメタステーブル平面化されたトリアリルボラン π システムの二重トラッピング
Heekyoung Choi1, Soichiro Ogi2, Naoki Ando2
1Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan.
Journal of the American Chemical Society
|February 10, 2021
まとめ
ボロンを含む分子の 超分子ポリメリゼーションのための 運動制御方法を開発しました このアプローチにより,高濃度でも螺旋型のナノ構造と均質なナノファイバーが形成されます.
科学分野:
- 超分子化学
- 材料科学
- 有機化学
背景:
- ボロンを含むπ結合分子は先進的な材料にとって有望である.
- 濃縮された条件下で超分子ポリメリゼーションを制御することは依然として困難です.
- 分子アセンブリにおけるメタステーブル状態は,運動制御のために利用できる.
研究 の 目的:
- ボロン含有分子のための運動制御された超分子ポリメリゼーション方法について報告する.
- 新しい平面化されたトリアリルボランモノマーを合成し特徴づけること.
- 螺旋状の超分子ナノ構造と均質なナノファイバーの制御された形成を達成する.
主な方法:
- ダイアミド鎖を持つ平面化されたトリアリルボランモノマーの合成
- メタステーブル状態の二重トラッピングに基づくシードメソッドを使用します.
- 運動制御のために,シネージ的分子内水素結合とルイス酸塩複合法を使用する.
- モノメアの安定化と集積に対するピリジンの効果を調査する.
主要な成果:
- トリアリルボラン単体 (1) の合成に成功した.
- 冷却時に協力的な超分子ポリメリゼーションを観察し,J型放射を持つ螺旋型のナノ構造を形成する.
- ピリジンの複合によって,自発的集積を遅らせて,メタステーブルな単体状態の安定化.
- 均質なナノファイバーをミリモラー濃度でもシードで生成する.
結論:
- 超分子ポリメリゼーションのための新しい運動制御戦略が確立されました.
- 水素結合とルイス酸複合によるダブルトラッピングは,メタステーブル状態を効果的に安定させます.
- 種まき方法は,高濃度条件下で制御されたポリメリゼーションを可能にし,均一なナノファイバーを生成します.
関連する概念動画
00:57Cationic Chain-Growth Polymerization: Mechanism
2.6K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.6K
03:24Hybridization of Atomic Orbitals I
58.9K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
58.9K
01:04Anionic Chain-Growth Polymerization: Mechanism
2.2K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.2K
03:08Hydroboration-Oxidation of Alkenes
9.9K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
9.9K
01:13Olefin Metathesis Polymerization: Overview
2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
2.3K
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.7K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.7K