The Raman spectrum of hexachlorodisilane was observed in the liquid state and the normal vibrations of this molecule were calculated by use of the Urey-Bradley field. The seven observed Raman frequencies could be assigned to the fundamental vibrations and the molecule was found to belong to the D3h′ symmetry. This means that the molecule exerts internal free rotation around the Si–Si bond as axis. This is in conformity with the experimental result of the electron diffraction investigation.
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Katayama et al. (1950) studied this question.
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