According to theoretical calculations, both 2′-deoxycytidine and cytidine show a different energetical behaviour as compared to the other nucleosides. A C–H···O intramolecular hydrogen bond is suspected to greatly influence the conformational behaviour of the nucleosides. The donor atom is the H6 (H8) atom of the pyrimidic (puric) nucleic base and the acceptor atom is the O5′ atom of the sugar. In the present work, we assess the hydrogen bond donor capacity of the H6/H8 hydrogen atom according to the base, by calculating deprotonation energies and electrostatic potentials. This allows us to state precisely that the peculiar behaviour of deoxycytidine expresses itself in the South conformation, and that cytidine does not behave like deoxycytidine.
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Hocquet et al. (2000) studied this question.