Enrofloxacinium oxalate.
The title salt, 2C19H23FN3O3 (+)·C2O4 (2-) {systematic name: bis-[4-(3-carb-oxy-1-cyclo-propyl-6-fluoro-4-oxo-1,4-di-hydro-quino-lin-7-yl)-1-ethyl-piperazin-1-ium] oxalate}, crystallizes with two independent monocations (A and B) and an oxalate dianion (C) in the asymmetric unit. The piperazinium ring in both the cations adopts a slightly disordered chair conformation. The dihedral angles between the mean planes of the cyclo-propyl ring and the 10-membered quinoline ring are 50.6 (5)° (A) and 62.2 (5)° (B). In each of the cations, a single O-H⋯O intra-molecular hydrogen bond is observed. In the crystal, the oxalate anions inter-act with the cations through N-H⋯O hydrogen bonds and weak C-H⋯O inter-actions, forming R 2 (2)(8) graph-set ring motifs. Weak C-H⋯F inter-actions along with further C-H⋯O inter-actions are observed between the cations, forming zigzag chains along [001]. In addition, π-π stacking inter-actions are observed with centroid-centroid distances of 3.5089 (13), 3.5583 (13), 3.7900 (13) and 3.7991 (13) Å.
Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
Thammarse S
TS
Yamuna
Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
Manpreet
M
Kaur
Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
Brian J
BJ
Anderson
Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
Jerry P
JP
Jasinski
Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India.
H S
HS
Yathirajan