Majhi Paresh Kumar, Huch Volker, Scheschkewitz David
Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66123, Saarbrücken, Germany.
Angew Chem Int Ed Engl. 2021 Jan 4;60(1):242-246. doi: 10.1002/anie.202009406. Epub 2020 Oct 26.
The versatile reactivities of disilenides and digermenide, heavier analogues of vinyl anions, have significantly expanded the pool of silicon and germanium compounds with various unexpected structural motifs in the past two decades. We now report the synthesis and isolation of a cyclic heteronuclear vinyl anion analogue with a Si=Ge bond, potassium silagermenide as stable thf-solvate and 18-c-6 solvate by the KC reduction of germylene or digermene precursors. Its suitability as synthon for the synthesis of functional silagermenes is proven by the reactions with chlorosilane and chlorophospane to yield the corresponding silyl- and phosphanyl-silagermenes. X-ray crystallographic analysis, UV/Vis spectroscopy and DFT calculations revealed a significant degree of π-conjugation between N=C and Si=Ge double bonds in the title compound.
在过去二十年中，二硅烯负离子和二锗烯负离子（乙烯基阴离子的重类似物）的多功能反应性显著扩展了具有各种意外结构特征的硅和锗化合物的种类。我们现在报告通过用钾还原锗烯或二锗烯前体合成并分离出一种具有Si=Ge键的环状异核乙烯基阴离子类似物，即硅锗化钾作为稳定的四氢呋喃溶剂化物和18-冠-6溶剂化物。通过与氯硅烷和氯膦烷反应生成相应的甲硅烷基和膦基硅锗烯，证明了其作为合成功能性硅锗烯的合成子的适用性。X射线晶体学分析、紫外/可见光谱和密度泛函理论计算表明，标题化合物中N=C和Si=Ge双键之间存在显著程度的π共轭。
