デロカライズされたNi2(μ-H) 2結合から生じる"中間スピン"ニッケル水化物複合体
Shu A Yao1, Amanda R Corcos, Ivan Infante
1Department of Chemistry, University of Wisconsin, Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States.
Journal of the American Chemical Society
|September 11, 2014
まとめ
ニッケルヒドリド複合体は,異常に短いニッケル-ニッケル結合と,予期せぬ三重基底状態を示す. この異常な電子構成は,特定のニッケル・ニッケル・パイ・スター軌道が半分を占有していることから生じる.
科学分野:
- 有機金属化学 有機金属化学
- 無機化学 無機化学とは
- コンピューティング・ケミストリー
背景:
- ニッケルヒドリド複合体は,触媒と調整化学において重要である.
- 金属と金属の結合と電子状態を理解することは,反応性を予測するために重要です.
研究 の 目的:
- ニッケルヒドリド複合体 [Cp'Ni(μ-H]の構造的および電子的性質を調査する2.
- その異常な磁気行動の起源を解明するために.
主な方法:
- X線結晶学により,Ni-Ni結合距離を決定する.
- 変数温度と磁場感受性の測定.
- 密度関数理論 (DFT) と完全アクティブスペース自己一貫性フィールド/第2次乱理論 (CASSCF/CASPT2) の計算.
主要な成果:
- 2.28638(3) Åの非常に短いNi-Ni結合距離が観測されました.
- 複合体は, +90 Kの大きなゼロフィールド分割で予期せぬ三重の基底状態を示しています.
- 電子構造の計算により,この三重基底状態は,退廃したNi-Ni π*軌道が半分を占有していることが確認された.
結論:
- 短いNi-Ni結合とトリプル基底状態は,本質的に結びついている.
- 電子構造は,観測された磁気特性の明確な説明を提供します.
- この研究は,ダイニッケル複合体の結合に関する新しい洞察を提供します.
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