銅 (((I) -二酸化炭素の反応性を,2- (((2-ピリジル) エチラミン二酸化物リガンドによる微調整
Masayasu Taki1, Shinichi Teramae, Shigenori Nagatomo
1Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Corporation, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
Journal of the American Chemical Society
|May 30, 2002
まとめ
銅 (((I) -二酸化炭素の反応性は,ピリジルエチラミンリガンドを用いて研究されました. A bis (mu-oxo) dicopper (III) 複合体は,銅-酸素化学における反応経路と産物形成に影響を与える重要な中間物質として特定されました.
科学分野:
- バイオ・オーガニック化学 バイオ・オーガニック化学
- 有機金属化学 有機金属化学
- 協調化化学について
背景:
- 銅二酸化酸素化学は,チロシナゼやラッカゼのような金属酵素を理解するために重要である.
- 銅複合体の分子酸素との反応性は複雑で,リガンド環境に対して敏感である.
研究 の 目的:
- バイデント酸ピリデルエチアミンリガンドが,銅 ((I) -二酸化炭素反応性に対する影響を調査する.
- 銅と酸素の反応に関与する反応的中間物質とメカニズムを解明する.
主な方法:
- 各種2−−−−−−−ピリジルエチラミンリガンドを含む銅 (I) 複合体の合成と特徴付け.
- コントロールされた条件下で銅複合体の分子酸素との反応.
- 中間物質を特定し,反応速度を決定するために,運動および光譜分析 (UV-Vis) を行う.
主要な成果:
- リガンドの構造,特に6メチル基とN-アルキル置換物の存在は, (mu-eta(2):eta(2)-peroxo) dicopper ((II) 複合体またはbis ((mu-oxo) dicopper ((III) 複合体の形成を決定する.
- ビス (mu-oxo) ディコッパー (III) コンプレックスは一般的な中間物質であり,酸化性N-デアルキル化につながります.
- ラッカース活性部位に似た混合バレンスの三核銅 (II,II,III) 複合体が形成され,2,4-di-tert-butylphenolを酸化することが示された.
結論:
- ピリジルエチラミンリガンドのステリックおよび電子特性により,銅-二酸化酸素反応性が著しく調節されます.
- ビス (mu-oxo) 二銅 (III) 複合体は,銅触媒による酸化反応における多用途の中間物質である.
- 三核銅複合体は,酵素活性部位を模倣し,酸化剤として機能することができます.
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