Neutral Hexacoordinate Silicon(IV) Complexes with a SiO4NC or SiO3N2C Skeleton and Neutral Pentacoordinate Silicon(IV) Complexes Containing a Trianionic Tetradentate O,N,O,O Ligand

Abstract A series of neutral hexacoordinate silicon(IV) complexes with a SiO4NC or SiO3N2C skeleton was synthesized. Additionally, two neutral pentacoordinate silicon(IV) complexes with a SiO3NC skeleton were synthesized. All compounds studied were structurally characterized by multinuclear NMR spectroscopy in the solid state and in solution and by single‐crystal X‐ray diffraction. The hexacoordinate compounds studied contain a tridentate dianionic O,N,O or N,N,O ligand, a phenyl ligand, and a symmetrically substituted derivative of an acetylacetonato ligand of the formula type RC(O)–CH=C(OSiMe3)R (R = Me, Ph, CF3). The two pentacoordinate complexes contain a tetradentate trianionic O,N,O,O ligand and a phenyl ligand.