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Silicon(II) Coordination Chemistry: N-Heterocyclic Carbene Complexes of Si2+ and SiI+


  • We thank the Deutsche Forschungsgemeinschaft (SFB 813) for generous financial support of this work. We also thank C. Schmidt, K. Prochnicki, and H. Spitz for recording the solution NMR spectra, Dr. S. Schwieger for collection of the data for one X-ray crystal structure, Dr. W. Hoffbauer for recording the 29Si{1H} MAS-NMR spectrum of 2-I and A. Martens for the elemental analyses.


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Ligand swap: The exchange of N-heterocyclic carbene (NHC) ligands at SiII centers is shown to provide access to a dicationic NHC complex of silicon(II), and an NHC adduct of the iodosilyliumylidene cation SiI+, [SiI(IiPr2Me2)(IDipp)]+ (see picture). Characterization studies led to the discovery of an unprecedented C[BOND]H⋅⋅⋅Si anagostic interaction for [SiI(IiPr2Me2)(IDipp)]+.