Abstract
The IR vs(PO32–) band shape of cytidine 5′-monophosphate (5′-CMP) in H2O solution at different concentrations, 0.009–0.3 mol dm–3, has been studied and the results have been interpreted in terms of the dynamics of the PO32– group. The relaxation of this mode in aqueous solution seems to be predominantly vibrational. A reasonably good fit was obtained applying theories for vibrational dephasing to the decay of the IR time correlation functions up to 3 ps. An intermediate modulation speed, ca. 1, for the vibrational frequency is obtained. The full-width at half-height of the band in H2O is ca. 3 cm–1 wider than in 2H2O. In the same way, the modulation speed is slightly higher and the decay of the correlation function is faster in H2O than in 2H2O. These effects could be associated with the smaller mass of the solvent molecules. Similar trends have been observed when increasing the concentration of the mononucleotide.
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