陽子結合レドックススイッチングは,無効化されたπ拡張コア変形オクタフィリン
Tridib Sarma1,2, Gakhyun Kim3, Sajal Sen2
1Center for Supramolecular Chemistry & Catalysis , Shanghai University , Shanghai 200444 , China.
Journal of the American Chemical Society
|September 6, 2018
まとめ
新しいオクタフィリンは,レドックスベースのスイッチングのために,陽子結合電子移転 (PCET) を受けます. この発見により,プロトネーションによる2電子の還元が容易になり,新しい合成システムが可能になった.
科学分野:
- 有機化学
- 超分子化学
- 写真化学
背景:
- 陽子結合電子移転 (PCET) は化学と生物学において極めて重要です
- PCETは合成リドックスシステムにおけるオン・オフの可能性を提供します.
- 合成システムでの PCET の利用は限られている.
研究 の 目的:
- PCETベースのスイッチングのためのコア改変オクタフィリンを開発する.
- 陽子結合二電子還元のメカニズムを調査する.
- レドックスポテンシャルに対するプロトネーションの影響を調べるため
主な方法:
- ナフトビピロールとディチオノチオフェンの前駆体から,平面的,弱い反芳香/非芳香のオクタフィリンを合成する.
- 水素ハライドを用いたプロトン結合二電子還元
- レドックスポテンシャルシフトを測定する電気化学分析.
- X線微分とスペクトロスコピーによる酸化および還元形態の特徴化.
主要な成果:
- オクタフィリンは,陽子結合による2電子還元を経て,化水素の存在で芳香形になります.
- トリフッ素酸で [4n+1] π電子中間基状態が観察された.
- プロトネーションは減少ポテンシャルをアノディカルにシフトさせ,ハリドアニオンからの電子移転を容易にする.
- TTF,PTZ,カテキールなどの電子に富んだ分子もPCETを誘導する.
結論:
- 開発されたオクタフィリンは,PCETによって駆動される酸化還元交換システムとして作用する.
- プロトネーションはオクタフィリンの電子特性を調節し,電子の移転を促進する鍵です.
- この研究は,合成リドックス活性材料におけるPCETの応用を拡大する.
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