The spectra and structures of sulphur-containing compounds. Part III. The vibrational spectra and conformations of acyclic sulphoxides

The IR and Raman spectra of the acyclic sulphoxides CH3S(O)CH2Cl, CH3S(O)CH3S(O)CH2Br, p-CIC6H4S(O)CH2Cl and p-CH3C6H4S(O)CH2Br in their liquid and crystalline states and IR solution spectra have been recorded. A normal coordinate analysis has been carried out, an interpretation of the vibrational spectra given and the force fields determined. It has been shown that acyclic sulphoxides exist as a mixture of conformations in the liquid and in solutions. The values of ΔH for the relative stabilities have been determined from the IR spectra of solutions at different temperatures. © 1982