The zwitterionic compounds 1 and 2 are the first pentacoordinate silicates with covalent SiS4C skeletons. They were characterized by crystal‐structure analyses and NMR spectroscopic studies. Although pentacoordination of silicon is usually favored by ligand atoms of high electronegativity, the structural data of both 1 and 2 are consistent with the presence of five covalent bonds to the silicon atom.
Die zwitterionischen Verbindungen 1 und 2 sind die ersten fünffach koordinierten Silicate mit kovalent aufgebautem SiS4C‐Gerüst. Normalerweise wird die Pentakoordination von Silicium durch Ligandenatome hoher Elektronegativität begünstigt, doch sind die Strukturdaten (aus Kristallstrukturanalysen und NMR‐Untersuchungen) in Einklang mit dem Vorliegen fünf kovalenter Bindungen zum Siliciumatom.
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