Moxifloxacinium chloride monohydrate

Abstract

The title compound {systematic name: 7-[(1S,6S)-8-aza-2-azonia-bicyclo-[4. 3.0]non-8-yl]-1-cyclo-propyl-6-fluoro-8-meth-oxy-4-oxo-1,4-dihydro-quinoline-3- carb-oxy-lic acid chloride monohydrate}, C 21H 25FN 3O 4+·Cl -·H 2O, crystallizes with two moxi-floxa-cinium cations, two chloride ions and two uncoordinated water molecules in the unit cell. The crystal structure has a pseudo-inversion center except for the chloride ions. In both moxifloxacinium cations, the quinoline rings are approximately planar, the maximum atomic deviations being 0.107 (3) and 0.118 (3) Å. The piperidine rings adopt a chair conformation while the pyrrolidine rings display a half-chair conformation. In the crystal, the carboxyl groups, the protonated piperidyl groups, the uncoordinated water mol-ecule and chloride anions participate in O-H⋯O, O-H⋯Cl and N-H⋯Cl hydrogen bonding; weak intermolecular C-H⋯O and C-H⋯Cl hydrogen bonding is also present in the crystal structure.