Abstract
THE AH stretching band of a strongly hydrogen bonded AH..B system is usually very broad and may present a complicated structure consisting of numerous sub-bands. In order to explain these sub-bands, the frequency modulation theory—that is, that the sub-band frequencies can be represented, by the expression ν = νAH±nν(AH)..B, where n = 0,1,2… and ν(AH)..B is any hydrogen bond frequency—has been advanced in the literature1–3. In the case of imidazole, which contains strong NH..N hydrogen bonds, we have suggested that the hydrogen bond-frequencies do not seem to be a decisive factor in determining the sub-band structure of the νNH absorption4. In this communication, we wish to show that the same is true for purine, which contains a similar hydrogen bonded system, by comparing the behaviour of the νNH sub-bands and the far infrared hydrogen bond frequencies of different isotopic species at different temperatures.
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NOVAK, A., LAUTIE, A. Structure of the NH Stretching Band and (NH).. N Hydrogen Bond Frequencies in Purine. Nature 216, 1202–1203 (1967). https://doi.org/10.1038/2161202a0
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DOI: https://doi.org/10.1038/2161202a0
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