The Vibrational Spectrum Of Allyl Mercaptan

The vibrational analysis of allyl mercaptan has vener been published. There are two internal rotors, the SH group and the CH₂SH group, in the allyl mercaptan molecule. As in the case of propylene (1), the molecule has only one plane of symmetry (C_s point group) in its most symmetrical configuration (when the thiol group lies in the plane of the vinyl group). However, microwave studies have shown that it exhibits C₁ symmetry (2). The infrared and Raman spectra of allyl mercaptan have been investigated in this study. The assignment of its fundamental modes has been made based on C₁ symmetry of the molecule.