Polymorphism of molecules and complex ions in oxygen compounds of silicon and phosphorus. Report 1. Nature of the Si-O-Si bonds and values of the valence angles of oxygen

Abstract

1. Changes in the order of the bonds R3'Si-OR as a function of the nature of the substituents R and R′ have been discussed on the basis of the literature data and original data. 2. The high sensitivity of the valence angle of the “bridge” oxygen atom in X-O-X bonds (X=Si, P) to variation of the nature of these bonds, primarily determined by the participation of dπ-pπ bonds, has been demonstrated.