Lomefloxacinium picrate

In the cation of the title compound systematic name: (RS)-4-(3-carboxy-1-ethyl-6,8-difluoro-4-oxo-1,4-dihydroquinolin-7yl)-2- methylpiperazin-1-ium 2,4,6-trinitrophenolate], C17H20F2N3O3+center dot C6H2N3O7-, the piperazine ring adopts a slightly distorted chair conformation and contains a protonated N atom. An intramolecular O-H center dot center dot center dot O hydrogen bond occurs in the cation. The dihedral angles between the mean planes of the six-atom piperazine ring and the 10-atom fused ring system is 43.3 (5)degrees. The picrate anion interacts with the protonated N atom of an adjacent cation through a bifurcated N-H center dot center dot center dot(O, O) three-center hydrogen bond. Strong N-H center dot center dot center dot O hydrogen bonds in concert with weak pi-pi stacking interactions centroid-centroid distance = 3.6460 (14) angstrom] dominate the crystal packing, creating a two-dimensional network structure along 011]