モノ核の親イミドからの分子ジルコニウムニトリド超基
Lauren N Grant1, Balazs Pinter2, Jun Gu1
1Department of Chemistry , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States.
Journal of the American Chemical Society
|December 4, 2018
まとめ
研究者は,ターミナルイミドとニトリドリガンドを備えた新しいジルコニウム複合体を合成し,特徴づけました. これらの研究は,非常に短いジルコニウム-窒素結合と非常に基本的なニトリドを明らかにし,金属-窒素多重結合の理解を進めています.
科学分野:
- 有機金属化学
- 無機化学
- 材料科学
背景:
- ジルコニウム複合体は,触媒と材料科学において極めて重要です.
- 金属-窒素の多重結合を理解することは,新しい化学変換の開発の鍵です.
- 以前の研究では,様々な金属窒素の機能が調査されているが,ジルコニウムの末端イミドおよびニトリド複合体は調査されていない.
研究 の 目的:
- 末端のイミドとニトリドリガンドを用いた新しいジルコニウム複合体を合成し,構造的に特徴づけること.
- これらの新しい化合物の電子的および構造的性質を調査する.
- ジルコニウムニトリド複合体の反応性と塩基性を調べる
主な方法:
- アジド前駆体によるジルコニウムイミドとニトリド複合体の合成.
- X線結晶学を用いた分離と構造的特徴化.
- 詳細な分析のために,光譜研究 (例えば,NMR,IR) と同位体ラベル (15N) を行う.
- コンピュータによる研究 (例えば,DFT) を用いて,探査機結合と電子構造を調べる.
主要な成果:
- ジルコニウムイミド複合体 (PN) 2ZrNHとジルコニウムニトリド複合体 (PN) 2ZrN[μ2-Li(THF) ]2の製造と分離に成功した.
- 非常に短いZrN結合距離 (1.830(3) をZrNHと1.822(2) をZrN−で確認した.
- ジルコニウムニトリド複合物は,pKb値が−36から−43の範囲で超基本性を表している.
- 計算分析により,ジルコニウム-窒素多重結合の性質の洞察が得られた.
結論:
- この研究は,前例のない短い金属-窒素結合を持つ新しいジルコニウムイミドとニトリド複合体を提示しています.
- ニトリドリガンドの高塩基性は,困難な化学変換で使用するための道を開きます.
- これらの発見は,初期の移行金属化学における複数の結合の基本的な理解に大きく貢献しています.
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