C–S Stretching Vibrations and Molecular Conformations of Isobutyl Methyl Sulfide and Related Alkyl Sulfides

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Abstract
The Raman and infrared spectra of isobutyl methyl sulfide and related alkyl sulfides were measured. The Raman spectra of the liquid, unannealed solid, and annealed solid of isobutyl methyl sulfide were compared and skeletal normal vibrations of possible rotational isomers were treated. Three rotational isomers were found to coexist in the liquid state whereas only one isomer was observed in the annealed solid. The energy differences among the three rotational isomers were measured. The correlations between the CH2–S stretching frequencies and molecular conformations were established, in common, for the molecules of isobutyl methyl sulfide, methyl propyl sulfide and ethyl methyl sulfide.