反応性マンガネス ((IV) 水酸化物複合体:高値金属-オクソポルフィノイド化合物による水素原子移転に欠けている中間体
Jan Paulo T Zaragoza1, Maxime A Siegler1, David P Goldberg1
1Department of Chemistry , The Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States.
Journal of the American Chemical Society
|March 16, 2018
まとめ
この研究は,希少なマンガネス ((IV) 水酸化物複合体を合成し,その強力な水素原子抽出能力を実証した. このマンガネス ((IV) 水酸化物種は,マンガネス ((V) オキシード複合体よりも著しく強いH原子抽出剤である.
科学分野:
- 無機化学
- バイオ有機化学
- キャタリシス
背景:
- 高価金属酸化物種は,O2の活性化と生産における重要な中間物質である.
- よく特徴づけられた単核M ((IV)) ((OH)) 複合体は希少であり,メカニズムの理解を制限している.
研究 の 目的:
- 新しい単核マンガネス (IV) 水酸化物複合体を合成し,特徴づけること.
- 関連するマンガンの種と比較して,この複合体の反応性とH原子抽出能力を調査する.
主な方法:
- マンガンの複合体の合成とX線 difraktion (XRD) 特性.
- UV-Vis光譜を用いたフェノールからH原子抽出の運動研究.
- 運動同位体効果 (KIE) の測定
主要な成果:
- ステリカルに要求されるコロールリガンドを使用して,Mn (IV) (OH) (ttppc) を合成し,構造的に特徴づけました.
- Mn ((IV) ((OH) ((ttppc) は,Mn ((V) ((O) ((ttppc) よりもH原子抽象化において,かなり高い反応性 (k2 ≈ 2.73 × 10^4 M^-1 s^-1) を示した.
- 置換されたフェノールとKIEデータからの相関は,協調されたH原子転送 (HAT) メカニズムを確認した.
結論:
- ステリカルに阻害されたMn (IV) (OH) コンプレックスは希少で強力なH原子抽出剤である.
- Mn (IV) (OH) 複合体は,H原子抽象化においてより高値のMn (V) (O) といくつかのFe (IV) (O) 複合体よりも優れている.
- この研究は,高価金属複合体によって介在されるO-H結合の解離のメカニズムに関する重要な洞察を提供します.
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