Infrared spectra of 2-pyridone-16O and 2-pyridone-18O

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Abstract
A comparison of the infrared spectra of natural 2-pyridone with that of the oxygen-18 labelled compound indicated modest shifts not only for the CO stretching mode (8.3−17.8 cm−1) for the various species in solution, but also for ring modes (0−13 cm−1) indicating a considerable mixing of the vibrations. The infrared spectrum of 2-pyridone at high concentrations revealed a new absorption band in chloroform solutions at 1685.0 and 1667.2 cm−1 for the unlabelled and labelled compound, respectively. In addition, absorption at 1614.9 cm−1 in the spectrum of 2-pyridone-18O in chloroform was found to be concentration dependent.

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