Abstract
The anhydrous salt levofloxacinium 4-methyl-benzoate, C(18)H(21)FN(3)O(4) (+)·C(8)H(7)O(2) (-), has been synthesized and its crystal structure determined. In the crystal, the levofloxacinium ions inter-act with the 4-methyl-benzoate anion via N-H(+)⋯O(-) and C-H⋯O hydrogen bonds, forming a tape-like supra-molecular structure. Hirshfeld surface analysis and the calculated two-dimensional finger plots of the various atom-atom contacts involving both the ions are described.