高反応性非ヘムフェV-オクソ中間体のスペクトロスクとDFTの特徴づけ
Ruixi Fan1, Joan Serrano-Plana2, Williamson N Oloo3
1Department of Chemistry , Carnegie Mellon University , 4400 Fifth Avenue , Pittsburgh , Pennsylvania 15213 , United States.
Journal of the American Chemical Society
|February 22, 2018
まとめ
サイクロヘキサンを素早く酸化する 鉄の新型中間物質を開発しました この高度に反応性のある種は,EPRとMössbauerスペクトロスコーピーを用いて特定され,その触媒的活動を促進するユニークな電子および構造的性質を示しています.
科学分野:
- バイオ有機化学と有機金属化学
- 触媒と反応機構
背景:
- 非ヘム鉄複合体は生物学的酸化反応において極めて重要です.
- 効率的な触媒の設計には 反応性中間物質の理解が不可欠です
- 以前の鉄種は,サイクロヘキサン酸化において限られた反応性を示した.
研究 の 目的:
- 新しい反応性鉄の中間物質を合成し,特徴づけること.
- これらの種によるサイクロヘクサンの酸化メカニズムを調査する.
- 主要な中間物質の酸化状態と電子構造を決定する.
主な方法:
- 低温でペラセチン酸とペロキシカルボキシル酸との反応
- 電子パラマグネティック共振 (EPR) とモッズバウアー光譜法.
- 密度関数理論 (DFT) の計算
主要な成果:
- 高度反応性のある中間物質 (2b(PAA)) が生成され,非ヘム鉄種によるサイクロヘキサン酸化の最も速い速度を示した.
- 鉄 ((V) 中間 (3b ((CPCA)) は,−0.08 mm/sのモースバウアー同位体シフトで特定された.
- DFTの研究では,3b (CPCA) のユニークな電子基底状態,Fe (V),Fe (IV),Fe (III) の混合物,ラビルなO-O結合を明らかにした.
結論:
- 新しい鉄中間産物は,前例のないC−H酸化反応性を示しています.
- 観察された反応性は,異常な電子構造と容易なO−O結合割れに起因する.
- この研究は,高価鉄酸化物種の触媒の仕組みについての洞察を提供します.
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