Directivity of the intramolecular O→Si bond in pentacoordinate organosilicone compounds

According to the data of X-ray diffraction analysis and quantum chemical calculations, in the hypervalent silicon compounds where the coordination cycle is closed by the C=O→Si-F fragment, the O→Si interatomic distance is governed by the orientation of the silicon atom determined by the C=O→Si angle. This is an indication of a directivity of the coordination bond O→Si; a regular variation in the nature of the latter is reflected in the observed dependence of the O→Si distance on the C=O→Si angle.