水素結合相互作用を示すOECの四核マンガネスモデル:水素過酸化への電解酸化への応用
Zhiji Han1, Kyle T Horak1, Heui Beom Lee1
1Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.
Journal of the American Chemical Society
|June 8, 2017
まとめ
研究者は,光システムIIにおける酸素進化複合体 (OEC) をモデル化するためにマンガン複合体を合成した. 水酸化複合体は,水酸化に不可欠なO−O結合形成のための電解活性を示した.
科学分野:
- バイオ有機化学
- 光触媒
- マンガンの調整化学
背景:
- 光学系IIにおける酸素進化複合体 (OEC) は,光合成における水の酸化に不可欠である.
- OECの合成モデルを開発することで,その構造と機能を理解できます.
- 第二の調整球の相互作用は酵素触媒に重要な役割を果たします.
研究 の 目的:
- 場所によって異なる四核マンガンの複合体を合成する.
- 生物学的に重要な相互作用のための水素結合置換剤を組み込む.
- O−O結合形成のためのこれらの複合体の電気触媒的活動を調査する.
主な方法:
- 異なる調整数を持つ四核マンガンの複合体の合成.
- 水素結合のためのアリラミン置換剤とピラゾラートリガンドを組み込む.
- 水酸化と基板酸化触媒を評価するための電気化学的研究.
主要な成果:
- 3つの6座標と1つの5座標のMnセンターを持つサイト区分されたマンガン複合体を成功裏に合成した.
- 水素結合ネットワークは,下位座標メタルセンターでアニオンリガンド (OH-, Cl-) をサポートした.
- 水酸化複合体は,O−O結合形成のための電解活性を示し,水からH2O2への酸化が観察された.
- 9,10-ジヒドロアントラセンの電気化学的酸化は,H原子抽出と酸素化によって,約50%のファラダイク収量で発生した.
結論:
- 合成されたマンガン複合体は,OECの機能モデルとして機能する.
- 水素結合の相互作用は,重要な中間物質の安定化に不可欠である.
- 水酸化複合体は,競合する反応にもかかわらず,水酸化のための電気触媒としての可能性を示しています.
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