Bis[1-cyclopropyl-6-fluoro-4-oxo-7-(1-piperazin-4-ium-1-yl)-1,4-dihydroquinoline-3-carboxylate-κ2 O 3,O 4]bis(nitrato-κO)copper(II)

In the title complex, [Cu(NO3)2(C17H18FN3O3)2], the CuII ion is located on an inversion center. It exhibits a distorted octahedral geometry, being coordinated by six O atoms, four from two ciprofloxacin ligand molecules (L), which act as bidentate ligands, and two from two nitrate anions. In the ligand, the piperazine ring has a chair conformation and the quinoline system is essentially planar [maximum deviation = 0.097 (2) Å]. One of the nitrate O atoms is disordered over two positions [occupancy ratio = 0.51 (6):0.49 (6)]. There is a C—H⋯F interaction in the complex. In the crystal, molecules are linked via N—H⋯O hydrogen bonds generating a two-dimensional network lying parallel to (111). The presence of C—H⋯O interactions leads to the formation of a three-dimensional structure. The title complex was prepared by hydrothermal synthesis, and the hexahydrate form of this complex, synthesized by conventional methods, has been reported previously [Hernandez-Gil et al. (2009 ▶). Polyhedron, 28, 138–144].


Related literature
For general background on the use of quinolones in the treatment of infections, see: Barbas et al. (2006); Basavoju et al. (2006); Xiao et al. (2005). For the synthesis and crystal structure of the hexahydrate form of this complex, see: Hernandez-Gil et al. (2009).
The asymmetric unit of the title compound is compossed of one Cu II ion, that is located on an inversion center, one L ligand and one NO 3anion (Fig. 1). The Cu II ion is coordinated by six O atoms, four from two L ligand molecules and two from two NO 3anions, in a distorted octahedral geometry. There is a C-H···F interaction in the complex. In the ligand the piperazine ring (N2,N3,C14-C17) has a chair conformation and the quinoline moiety (N1,C2-C10) is essentially planer [max. devsion = 0.097 (2) Å].
In the crystal, molecules are linked via N-H···O hydrogen bonds generating a two-dimensional network lieing parallel to (1 1 1). The presence of C-H···O interactions leads to the formation of a three-dimensional structure.
The geometrical parameters of the title compound are very similar to those of the hexhydrate form of this complex (Hernandez-Gil et al., 2009).

Refinement
The NH H atoms were located in a difference Fourier map. In the final cycles of refinement all the H atoms were The molecular structure of the title compound, with the atom numbering and displacement ellipsoids drawn at the 30% probability level. H atoms have been omitted for clarity [Symmetry code: (i) -x, -y, -z].