Lomefloxacinium picrate

• Main Authors: Jerry P. Jasinski, Ray J. Butcher, M. S. Siddegowda, H. S. Yathirajan, Q. N. M. Hakim Al-arique
• Format: Article
• Language: English
• Published: International Union of Crystallography 2011-02-01
• Series: Acta Crystallographica Section E
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536811002534

In the cation of the title compound [systematic name: (RS)-4-(3-carboxy-1-ethyl-6,8-difluoro-4-oxo-1,4-dihydroquinolin-7-yl)-2-methylpiperazin-1-ium 2,4,6-trinitrophenolate], C17H20F2N3O3+·C6H2N3O7−, the piperazine ring adopts a slightly distorted chair conformation and contains a protonated N atom. An intramolecular O—H...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)°. The picrate anion interacts with the protonated N atom of an adjacent cation through a bifurcated N—H...(O,O) three-center hydrogen bond. Strong N—H...O hydrogen bonds in concert with weak π–π stacking interactions [centroid–centroid distance = 3.6460 (14) Å] dominate the crystal packing, creating a two-dimensional network structure along [011].