Vibrational spectra and conformation of diallyl disulphide in the liquid state

Abstract The infrared and Raman spectra of diallyl disulphide have been measured in the liquid state. Normal-coordinate analysis was performed with the structural parameters of the five leading conformers being obtained from molecular-mechanics calculations. It is concluded that diallyl disulphide in the liquid state adopts only the gauche conformation about the CS bonds, while the anti conformation would be made unstable by intermolecular interactions and that a G (+) G (−)- G (+)G(−) sequence is the leading conformation.