Spectra and Structure of Silicon-Containing Compounds. X. Infrared and Raman Spectra of Methoxytrimethylsilane and Methoxy-D 3 -Trimethylsilane

Abstract

The infrared (20 to 3100 cm⁻¹) and Raman (10 to 3100 cm⁻¹) spectra of gaseous (CH₃)₃SiOCH₃ and (CH₃)₃SiOCD₃ have been recorded. The Raman spectra of both liquids and the infrared and Raman spectra of the “light” compound in the solid state have also been recorded. A vibrational assignment based upon depolarization ratios, frequency shifts with isotopic substitution, and group frequencies is proposed. The Si—O torsional mode was observed at 67 cm⁻¹ which gives a barrier to internal rotation of 1.02 kcal/mol. Strong mixing of the Si—O—C bending mode with the C—Si—C bends is proposed. The CH₃—O torsion was not observed.