Rotational spectrum and structure of the tetrahydrothiophene⋯hydrogen fluoride complex

The ground-state rotational spectra of two isotopomers, C4H832S⋯HF and C4H834S⋯HF, of the tetrahydrothiophene⋯HF complex have been analyzed to give rotational constants, centrifugal distortion constants and the H,F nuclear spin–nuclear spin coupling constant Daa. These parameters are consistent with a dimer structure characterized by a distance r(S⋯F)=3.067(22) Å, an angle of 88.28(29)° between the S⋯F internuclear line and the line bisecting the CSC angle and an angle of deviation of the S⋯F internuclear line from the CSC angle bisector plane of 1.64(75)°. The deviation from collinearity of the atoms S⋯H–F has been found to be θ=10.5(45)°.