ターミナルFe (IV) ニトリドによる窒素固定
Niklas B Thompson1, Michael T Green2, Jonas C Peters1
1Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.
Journal of the American Chemical Society
|October 10, 2017
まとめ
研究者は,N2から末端鉄窒素 (FeN) 種を合成し,鉄媒介による窒素固定の直接的な証拠を提供した. この突破は,窒素ガスをアンモニアに変換するチャット型メカニズムをサポートします.
科学分野:
- 無機化学
- カタリシス
- 生物化学
背景:
- 終末鉄酸ナトリド (FeN) は,生物学的および化学的な窒素固定における中間物質である.
- N2から派生したFeN種の実験的証拠と合成例は稀である.
研究 の 目的:
- 窒素固定における中間物質としての末端鉄窒化物の実験的証拠を提供すること.
- FeN種をN2から直接合成し,特徴づけること.
- 鉄を媒介する窒素をアンモニアに変換するメカニズムを解明する.
主な方法:
- 窒素を固定するFe-N2触媒のプロトネーション
- ハイドラジド2-) 種を含む反応中間物の特徴
- N-N結合の割れとアンモニアの放出の分析
主要な成果:
- Fe-N2複合体の陽子化により中性Fe(NNH2) 水酸化物(2-) が形成された.
- [FeIVN]+とアンモニア (NH3) を放出するヘテロリティックなN-N結合分裂が発生した.
- N2から派生した末期FeN種の直接的な実験的証拠が得られた.
結論:
- この発見は,鉄媒介によるN2からNH3への変換のチャット型 (遠隔) 機構を支持する.
- リガンド共振は,触媒処理中の鉄複合体の酸化状態をバッファリングする役割を果たします.
- この研究は,合成と天然の窒素固定システムのための触媒の設計に関連する洞察を提供します.
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