On the Photochemistry of Purine Nucleobases

We present R2PI spectra of a series of purine nucleobases, nucleosides, and related derivatives, including adenine, guanine, guanosine, 2-aminopurine, 2,6-diaminopurine, 9-ethyladenine, and 9-methylguanine. We compare the results with models involving two interacting excited states, which have been...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2001-05, Vol.105 (21), p.5106-5110
Main Authors: Nir, Eyal, Kleinermanns, Karl, Grace, Louis, de Vries, Mattanjah S
Format: Article
Language:English
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Summary:We present R2PI spectra of a series of purine nucleobases, nucleosides, and related derivatives, including adenine, guanine, guanosine, 2-aminopurine, 2,6-diaminopurine, 9-ethyladenine, and 9-methylguanine. We compare the results with models involving two interacting excited states, which have been proposed to explain the short excited-state lifetime of most nucleobases. The amino group in the 2 position appears to have a strong effect on the excited-state potentials, as does any substitution in the 9 position. This explains the very different fluorescence characteristics of 2-aminopurine, but it raises new questions concerning the short lifetime of guanine in solution.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp0030645