Abstract

AbstractA recently published review on the effective oxygen charge in SiO2 and its dependence on the bond angle of oxygen has shown that, as a rule, solid‐state theoretical calculations lead to the conclusion that the oxygen charge increases with increasing bond angle, whereas quantum‐chemical calculations for limited clusters yield an opposite result, i.e. a decrease of the oxygen charge with increasing oxygen angle. In the present paper it is shown that also a quantum‐chemical approach to the problem, namely a molecular‐orbital calculation for an SiOSi bridge, reveals an increase of the charge of oxygen with its bonding angle, which is, however, relatively weak.

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