In the title compound, 4-(3-carboxy-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-quinolinyl)-1- piperazinium—magnesium hexahydrate—sulfate—water(1/0.5/1/3), (C17H19FN3O3)[Mg(H2O)6]0.5SO4.3H2O, the Mg2+ ion lies on a twofold axis and adopts a nearly regular octahedral geometry. The quinolone is protonated at the terminal N atom of the piperazine residue. The H atom of the carboxylic group is hydrogen bonded to the carbonyl O atom, thus preventing the bonding of the metal to this part of the molecule.
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Turel et al. (1996) studied this question.
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