IR-UV double-resonance spectroscopy of the nucleobase adenine

Chr Plützer, E. Nir, M. S. de Vries, K. Kleinermanns

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Abstract

We present R2PI and IR-UV double resonance spectra of the nucleobase adenine seeded in a supersonic jet. We show that there is only one tautomer of adenine which absorbs in the wavelength range 36050 to 36700 cm-1. The IR spectra, measured in the range 3200 to 3700 cm-1, show bands at 3452, 3508 and 3569 cm-1, which we assign to the symmetric NH2, N-H and antisymmetric NH2 stretching vibrations of a single tautomer of adenine. We compare the experimental IR-UV double resonance spectra with ab initio based normal mode calculations. The observed tautomer is most probably the 9H amino-form of adenine.

Original languageEnglish
Pages (from-to)5466-5469
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume3
Issue number24
DOIs
StatePublished - 1 Jan 2001
Externally publishedYes

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