THE ANGULAR GEOMETRY OF THIIRANE...HF AND THE NONLINEARITY OF THE HYDROGEN-BOND FROM ROTATIONAL SPECTROSCOPY

Rotational constants (A(0), B-0, C-0), centrifugal distortion constants (Delta(J), Delta(JK), Delta(K), delta(J), delta(K)) and the H, F nuclear spin-nuclear spin coupling constant D-aa(HF) of the hydrogen-bonded complex (CH2)(2)S...HF were determined by analysis of 18 mu(a) and mu(b) transitions observed by pulsed-nozzle, Fourier-transform microwave spectroscopy. An angular geometry in which the HF subunit is almost perpendicular to the plane of the (CH2)(2)S molecule and in which the S...H-F hydrogen bond deviates from linearity by approximate to 17 degrees was established by an interpretation of the spectroscopic constants.