Syntheses and crystal structure determination of hexacoordinated silicon-complexes with dimethylpyridines [German]

摘要

Trichlorosilane, HSiCl3, forms with 3,4-dimethylpyridine in aprotic solvents a crystalline 1:2-compound which is stable at room temperature and readily soluble in CHCl3. Colourless crystals of the dicationic complex, [H2Si(3,4-dimethylpyridine)(4)](2+)2Cl(-) . 6 CHCl3 (verified by X-ray structure analysis) are obtained by dismutation of HSiCl3(3,4-dimethylpyridine)(2) in CHCl3 within one week at room temperature. Si-29 NMR indicates that SiCl4 is generated as a second product. H2SiCl2 with 2,4-dimethylpyridine as well as MeHSiBr2 with 3,5-dimethylpyridine in aprotic solvents form 1:2-compounds stable at room temperature. X-ray structure analyses in both cases establish neutral-complexes with a hexa-coordinated silicon atom. [References: 21]