Normalkoordinatenanalyse, Infrarot- und Ramanspektren von 2,2-dimethyltrisilan

Abstract

The Infrared and Raman vibrational spectra of (H 3Si) 2SiMe 2 and (D 3Si 2SiMe 2 have been measured and assigned with the help of a normal coordinate analysis using the FG formalism. The skeletal deformation modes δ, ρ, γ, τSiC 2 and δSiSiSi of the molecule are not coupled with motions of the hydrogen atoms and can be regarded as “unperturbed” deformation vibrations of the SiSiC 2Si atom arrangement. Their knowledge facilitates the interpretation of the vibrational spectra of methylated chainlike silanes in the low frequency region between 250 and 100 cm −1.