Vibrational modes of nucleoside deoxyadenosine monohydrate investigated under high pressure

The vibrational properties of the nucleoside deoxyadenosine monohydrate were investigated with Raman spectroscopy in the crystal form of the material. A tentative assignment of the vibrational modes was made through the knowledge of vibrations in similar materials. The behavior of the crystal under...

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Veröffentlicht in:Vibrational spectroscopy 2020-09, Vol.110, p.103140, Article 103140
Hauptverfasser: Quimbayo, Jennyffer S.M., Lima, Raphaela A., Vasconcelos, Daniel L.M., Freire, Paulo T.C.
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Sprache:eng
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Zusammenfassung:The vibrational properties of the nucleoside deoxyadenosine monohydrate were investigated with Raman spectroscopy in the crystal form of the material. A tentative assignment of the vibrational modes was made through the knowledge of vibrations in similar materials. The behavior of the crystal under high pressure was investigated up to 5.6 GPa. The results suggest a phase transition undergone by the crystal between 0.6 at 0.8 GPa as indicated by discontinuities on the wavenumber of some modes and changes in the Raman spectra. The phase transition involved a hydrogen bond between the sugar and the water molecule as it is observed through the changes of a COH bending vibration. Above the pressure of the phase transition, it is observed that the vibrational modes continue to change continuously up to the highest pressure reached in the experiment. Finally, the phase transition appears as completely reversible.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2020.103140