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Preparation of SNS Cobalt(II) Pincer Model Complexes of Liver Alcohol Dehydrogenase
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三コーディネートコバルトの減少力 (I)
Michael J Ingleson1, Maren Pink, Kenneth G Caulton
1Department of Chemistry, Indiana University, Bloomington, 47405-7102, USA.
Journal of the American Chemical Society
|March 30, 2006
まとめ
PNPリガンドを持つコバルト複合体は一酸化炭素を容易に結合し,簡単に酸化するコバルト (I) センターを示します. しかし,コバルト (III) への完全な酸化は困難であり,その代わりに中間種が形成されます.
科学分野:
- 有機金属化学 有機金属化学
- 協調化化学について
- 無機合成の無機合成とは
背景:
- 低価変種金属複合体の反応性は,触媒と材料科学にとって極めて重要です.
- コバルト複合体,特にフォスフィンリガンドは,その多様な酸化状態と結合能力のために興味があります.
- コバルト複合体の電子特性と酸化経路を理解することは,新しい機能性分子の設計に役立ちます.
研究 の 目的:
- 大量のPNPリガンドで支えられているコバルト複合体の協調化学と酸化行動を調査する.
- 炭素一酸化物および酸化剤との反応で形成される製品の特徴を述べる.
- この特定のリガンド環境におけるコバルト酸化の限界を探求する.
主な方法:
- (PNP) Co複合体の合成と特徴付け.
- 炭素一酸化物の調整を研究するための赤外線スペクトロスコーピー.
- ヨウ素 (I2) とダイアゾ化合物 (N2CH(SiMe3) との反応により,酸化を検出する.
- 反応産物の構造を決定するX線結晶学.
主要な成果:
- (PNP) Coに一酸化炭素を添加すると, (PNP) Co (CO) が得られ,ヌーコ値は1885cm-1で,重要なバックドネーションと容易に酸化するCo (I) センターを示しています.
- (PNP) CoをI2で酸化すると,安定したCo(III) 種が生じないが,代わりに (PNP) CoIとズウィテリオン系Co(III) 複合体[ItBu2PCH2SiMe2NSiMe2CH2PtBu2]CoI2が形成される.
- N2CH(SiMe3) との反応により,1:1アダクトが生じるが,その結晶構造は,Co(Iの部分的酸化を示唆し,完全なCo(III) 状態には及ばない.
結論:
- 巨大なPNPリガンドは,容易に酸化可能なCo (I) 状態を安定させ,CO結合を促進します.
- コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのアクセシビリティは,コバルト中心のより高い酸化状態へのより高い酸化状態へのより高い酸化状態へのより高い酸化状態へのより高い酸化状態へのより高い酸化状態へのより高い酸化状態よりよりよりよりより高い酸化状態よりよりよりより高い酸化状態よりよりよりより高い酸化状態よりよりより高い酸化状態よりよりより高い酸化状態よりより高い酸化状態
- 観察された反応性は,有機金属化学で,調整されたリガンド設計で達成可能な酸化還元特性に対する微妙な制御を強調しています.
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