Abstract
The rotational spectrum of the quinuclidine–water complex has been observed in the region 6–20 GHz using a pulsed molecular beam Fourier transform microwave (MB-FTMW) spectrometer. In order to obtain detailed structural information on the complex, spectra of quinuclidine, also called 1-azabicyclo[2.2.2]octane (ABCO), combined with both H2O and H218O were examined. The observation of a symmetric top spectrum is consistent with a complex in which water undergoes internal rotation. Using a reasonable model for the interaction potential, it has been possible to estimate the torsional barrier of water. Centrifugal distortion analysis yields a N–H bond stretching force constant of 12.3 N/m, corresponding to a stretching frequency of 116 cm−1for ABCO–H216O.
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