イリル (イチネ): 金属か,炭素基?
Dennis G H Hetterscheid1, Jasper Kaiser, Eduard Reijerse
1Radboud University Nijmegen, Institute for Molecules and Materials, Department of Metal-Organic Chemistry, Toernooiveld 1, NL-6525 ED Nijmegen (The Netherlands).
Journal of the American Chemical Society
|February 11, 2005
まとめ
イリジウム複合体の1電子酸化により,安定したIr(II) -オレフィン種が生み出され,それらは急性反応を起こします. 溶媒の選択とTEMPOのような急性捕獲剤は,反応経路と製品形成に影響を与え,ニトロシル,ブリッジド,またはアセタミド複合体を産生します.
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
- ラジカル・ケミストリー (Radical Chemistry) とは
背景:
- ポリデンテートアミンリガンド (Me(n) tpaを含むイリジウム複合体は,その触媒的可能性で知られている.
- Ir (I) 複合体の1電子酸化により,独特の電子特性を有する反応性Ir (II) 種が生成される.
研究 の 目的:
- 1電子酸化されたイリジウム-エーテンの複合体の反応性を調べるために, [(Me(n) tpa) Ir(II) (((エーテン) ] (((2+).
- 溶媒ドナー容量と急性捕捉剤が反応経路に及ぼす影響を調査する.
- 結果となるイリジウムの種とその電子構造を特徴付けるため.
主な方法:
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- 反応中介物および産物の光譜特性 (UV-Vis,NMR) を測定する.
- 電子構造と反応機構を明らかにするための密度関数理論 (DFT) 計算.
主要な成果:
- 安定した5座標のIr(II) -olefin種, [(Me(n) tpa) Ir(II) (((エチネ) ] ((2+) が生成され,特徴づけられました.
- これらの種は,溶媒の協調によって影響される経路を持つ,メタロラジカルとしての反応性が実証されました.
- NOとTEMPOとのラジカルカップリング,エテンの橋渡しと水解反応が観察され,さまざまなイリジウム複合体が生じた.
結論:
- 電子的およびステリック的性質のMe (n) tpaリガンドと溶媒ドナー能力は,Ir (II) -オレフィン複合体の根性特性を調節する.
- これらの複合体は,金属とエーテンの両方のセンターで急性化学を調査するための多用途のプラットフォームとして機能します.
- 制御された過激捕獲は,機能化されたイリジウム複合体の選択的合成を可能にします.
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