Acta Cryst. (2004). E60, o1051-o1053  [ doi:10.1107/S1600536804011948 ]

Enoxacin hydroiodide

L.-C. Yu, H. Liang, C.-S. Zhou, Z.-F. Chen and Y. Zhang

Abstract: The title compound, C₁₅H₁₈FN₄O₃⁺·I^-, forms ionic crystals consisting of protonated enoxacin cations, C₁₅H₁₈FN₄O₃⁺, and I^- anions. The naphthyridine system of the cation is essentially planar, whereas the piperazine ring has a chair conformation; the enoxacin is protonated at the unsubstituted N atom of the piperazine ring. The carboxyl OH group forms an intramolecular hydrogen bond with the carbonyl O atom of the naphthyridine system, thus forming a six-membered pseudo-ring. The crystal packing is stabilized by - stacking of the naphthyridine rings and intermolecular hydrogen bonding involving the piperazine N-H group, the carboxyl group of the cation and the I^- anion, linking the residues of the structure into infinite chains running along the diagonal of the ac plane.

Online 22 May 2004

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