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https://hdl.handle.net/10316/17906
Título: | Spontaneous self-association of adenine and uracil in polycrystals from low temperature FTIR spectra in the range below 1000 cm−1 | Autor: | Rozenberg, M. Shoham, G. Reva, I. Fausto, R. |
Data: | Nov-2005 | Editora: | Elsevier B.V. | Título da revista, periódico, livro ou evento: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | Volume: | 62 | Resumo: | FTIR spectra of solid samples of co-crystallized adenine and uracil were measured at 10 K in the range below 1000 cm−1. New bands ascribable to the N3H (uracil) and NH2 (adenine) out of plane vibrations, which disappear upon D-exchange, were revealed in comparison with the spectra of pure polycrystalline adenine and uracil obtained in the same conditions. The observed changes relate to the same groups that establish the H-bonds in base pairs of naturally occurring nucleic acids, despite the presence of an extra proton donor NH-group in both molecules. The well-established empirical correlation between the out of plane NH vibrational frequencies and H-bond energies was successfully applied for estimation of the latter in the mixed crystal. | URI: | https://hdl.handle.net/10316/17906 | DOI: | 10.1016/j.saa.2004.12.037 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Química - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Spectrochimica Acta A, 62 (2005) 233.pdf | 243.4 kB | Adobe PDF | Ver/Abrir |
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