Abstract
Infrared (IR) spectra of the enol and keto forms of 4-amino-6-oxopyrimidine (AOP) isolated in a low-temperature Xe matrix were recorded, where the change from the keto to the enol form was found to be induced by UV irradiation (λ>270nm). On the other hand, the hydrated crystal of AOP exhibited a similar IR spectrum to the anhydrous crystal by dehydration, suggesting that the dehydrated and anhydrous crystals are polymorphs. It has been found from the IR spectral analyses that the AOP crystal is dominated by infinite double H-bonded ribbons, which has been supported by quantum chemical calculations.
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