Gas-phase Raman spectroscopy. The vibrational spectra (infrared and Raman) of hexachlorodisilane (gas, liquid, and solid) and assignment of fundamentals

Abstract

The i.r. and Raman spectra of hexachlorodisilane are reported in the frequency range 650–33 cm.^–1. The data is found to be consistent with an assignment based on a D_3d model. Normal co-ordinate calculations are performed on Si₂Cl₆ by use of modified simple valence force constants transferred directly from SiCl₄ and are found to be useful aid in the vibrational assignments. Splitting of the totally symmetrical silicon–chlorine stretching mode for Si₂Cl₆ is clearly resolved and five of the predicted seven components, due to the presence of ³⁵Cl and ³⁷Cl isotopes, are observed.