Torsional frequency, barrier to internal rotation, and dipole moment of N-sulphinylaniline from microwave rotational spectra
Microwave spectra of the ground and first three excited torsional states of N-sulphinylaniline have been assigned. The variation of the inertial defect with torsional number shows the molecule to be planar. The torsional frequency has been determined as ν = 41.1 cm -1 and the barrier to internal rotation as V2 = 2.3 kcal/mole. From the splittings of the Stark lobes of some lines the values μa = 2.20 ± 0.06, μb = 0.664 ± 0.005, and μtot = 2.30 ± 0.06 were obtained.