Abstract
Rotational spectra were observed for 10 isotopomers of the trimethylamine-water complex with use of a Fourier-transform microwave spectrometer. The observed spectra of all 10 isotopomers were characteristic of a symmetric top and are indicative of a free internal rotation of the water about the symmetry axis of trimethylamine. Analysis of the rotational constants reveals a structure with an essentially linear single hydrogen bond (1.82 A). The dipole moment of the complex was determined to be 2.37 (1) D with use of Stark effect measurements. Ab initio calculations were used to model the structure and intermolecular potential energy surface of the complex
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