Rotational spectrum, H, F nuclear spin–nuclear spin coupling and structure of the furan–HF dimer

Abstract

The rotational spectrum of the ground vibrational state of the hydrogen-bonded dimer furan–HF has been observed in the frequency region 6–18 GHz using molecular beam Fourier transform microwave spectroscopy (MB-FTMW). Accurate rotational and all quartic centrifugal distortion constants except Δ_K have been obtained for this complex. Additionally, the D_aa element of the ¹HF nuclear spin–nuclear spin coupling tensor has been determined from the hyperfine structure present in all the observed transitions. The rotational parameters are consistent with a planar equilibrium structure of C_2v symmetry for the dimer, with the HF subunit lying along the C₂ axis of the complex.