Abstract
A Urey—Bradley potential function has been fitted to the observed vibrational frequencies of pyridine, pyridine-2,6-d2, pyridine-3,5-d2, pyridine-4-d1, and pyridine-d5. As in the case of benzene, it was necessary to include an additional non-Urey—Bradley force constant ρ to describe the aromatic character of the molecule. Our results suggest several minor changes in the vibrational assignment of some of these molecules.
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