Isolation of H2S…ClF in a pre-reactive mixture of H2S and ClF expanded in a coaxial jet and characterisation by rotational spectroscopy

The reaction between H2S and ClF was precluded and H2S…ClF isolated by a coaxial supersonic expansion of the gaseous components into the Fabry-Pérot cavity of a pulsed-nozzle, Fourier-transform microwave spectrometer. The ground-state rotational spectra of seven isotopomers of H2S…ClF were analysed and gave in each case the spectroscopic constants 12(B0 + C0), DJ, χaa (Cl) and Mbb (Cl). Interpretation of these constants revealed the complex to have a geometry of Cs symmetry with the S…ClF nuclei collinear in the order shown, with the angle 180°−φ = 84.2(4)° between the C2 axis of H2S and the S…ClF axis, and with r(S…Cl) = 2.857(3) Å.