Conformational properties of F2SNCF2NSF2 and F2SNCF2NS(O)F2: Vibrational spectra and quantum chemical calculations

► A single conformer exists for F2S=N-CF2-N=SF2. ► Probably two, possibly three conformers exist for F2S=N-CF2-N=S(O)F2. ► The predicted number of stable conformers depends strongly on the computational method.