Abstract
In tris(8-oxyquinolinato)phenylsilicon a novel coordination pattern of two 8-oxyquinolinate moieties in hexacoordinate Si complexes was found: cis-(O,O′)-cis-(N,N′). The product of the reaction between 1-chloro-1,2,5-triphenyl-2,5-diazasilolidine and sodium 8-oxyquinolinate [1-(8-oxyquinolinato)-1,2,5-triphenyl-2,5-diazasilolidine] bears a tetracoordinate Si atom. Replacing 8-oxyquinolinate by 8-oxyquinaldinate, however, leads to the formation of tris-(8-oxyquinaldinato)phenylsilicon with hexacoordinate Si atom, but with trans-(O,O′)-cis-(N,N′)-chelation. This is the first structurally and spectroscopically characterized 8-oxyquinaldinato Si complex with hypercoordinate silicon atom.
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