Abstract
The Raman spectra (0 to 3300 cm<sup>-1</sup>) of (CH<sub>3</sub>)<sub>3</sub>Si(CHCH<sub>2</sub>) and (CD<sub>3</sub>)<sub>3</sub>Si(CHCH<sub>2</sub>) in the gaseous, liquid and solid states have been recorded. The infrared spectra (20 to 3300 cm<sup>-1</sup>) of the same two compounds in the gaseous and solid states have also been recorded. A vibrational assignment based upon depolarization ratios, frequency shifts with isotopic substitution, infrared band contours, and group frequencies is proposed. The SiC<sub>3</sub> torsion was observed at 55 and 50 cm<sup>-1</sup> for the "light" and "heavy" molecules, respectively, and the barriers to internal rotation were calculated to be 0.73 kcal/mol and 0.64 kcal/mol for the light and heavy compounds, respectively. These results are compared to the corresponding data for similar molecules.
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