An Adduct of Magnesium Sulfate with a Member of the Quinolone Family (Ciprofloxacin)

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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