Abstract
The rotational spectrum of a hydrogen-bonded dimer between vinylacetylene (H 2CCHCCH) and HF has been obtained with a pulsed-nozzle Fourier-transform microwave spectrometer. Analysis of the derived spectroscopic constants shows that the HF molecule attaches preferentially to the triple bond in vinylacetylene, in a T-type configuration close to the CC bisector, at a perpendicular distance R CC…F of 3.072 Å. The r o structure of the dimer is planar and a limit of 9° is placed on the equilibrium departure from planarity by consideration of the average r * structure. This is in contrast to an out-of-plane angle of 34° in vinylacetylene…HCl; the difference is rationalised in terms of changes in steric interaction between vinylacetylene and the HX proton donor.
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