Microwave spectrum, structure, and dipole moment of ethylene sulfone

The microwave rotational spectra of the 32S and 34S isotopic species of ethylene sulfone have been observed. The rotational constants A, B, and C in megahertz are: 6676.06, 4924.01 and 3759.97 for the 32S species; and 6679.20, 4917.07, and 3757.64 for the 34S species. The structural parameters obtained are r(S–O) = 1.42 ± 0.02 Å, r(C–C) = 1.586 ± 0.01 Å, r (C–S) = 1.76 ± 0.02 Å, and ∠OSO = 124 ± 2o, with the assumption that the C–H distance and ∠HCH and ∠H2CC angles are the same as those of ethylene sulfide. From the measurements of Stark shifts, the dipole moment has been determined to be 4.47 ± 0.02 D.