An Isolable Silicon Dicarbonate Complex from Carbon Dioxide Activation with a Silylone

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• 作者：Dipl.-Chem. Alexander Burchert ; Dr. Shenglai Yao ; Dr. Robert Mü ; ller ; Caspar Schattenberg ; Dr. Yun Xiong ; Prof. Dr. Martin Kaupp and Prof. Dr. Matthias Driess
• 刊名：Angewandte Chemie
• 出版年：2017
• 出版时间：February 6, 2017
• 年：2017
• 卷：129
• 期：7
• 页码：1920-1923
• 全文大小：695K
• ISSN：1521-3757

文摘

The first isolable molecular silicon dicarbonate complex (bis-NHC)Si(CO₃)₂ 2 (bis-NHC=H₂C[{NC(H)=C(H)N(Dipp)}C:]₂, Dipp=2,6-iPr₂C₆H₃) was synthesized by facile reaction of the bis-N-heterocyclic carbene stabilized silylone (bis-NHC)Si 1, bearing a zero-valent silicon atom, with carbon dioxide. The monomeric silicon dioxide complex (bis-NHC)SiO₂ 3 supported by the bis-NHC ligand was proposed as a key intermediate resulting from double oxygenation of the zero-valent silicon atom in 1 by two molar equivalents of CO₂ under liberation of CO; its subsequent Lewis acid–base reaction with CO₂ leads to 2 which has been fully characterized including an single-crystal X-ray diffraction analysis. Its electronic structure, spectroscopic data and the thermochemistry of the formation have been studied quantum-chemically.