Ethyl 7-chloro-1-cyclopropyl-6-fluoro-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylate

In the title compound, C15H12ClFN2O5, molecules are packed in the crystal lattice in a parallel fashion sustained by various C—H⋯O [C⋯O = 3.065 (5)–3.537 (5) Å] and C—H⋯Cl [3.431 (5)–3.735 (4) Å] interactions.


Experimental
The title compound was synthesized according to the published literature (Al-Hiari et al., 2006) and it has been recrystallized from hot ethanol to produce a yellow crystalline material

Refinement
Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc.and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger. The H atom was located from difference Fourier syntheses and its position and isotropic displacement parameter refined freely.  Molecular structure of the title compound. The thermal ellipsoids are drawn at the 30% probability level.

Figure 2
Molecular packing displaying C-H···Cl and C-H···O interactions in the title compound (I).

Special details
Experimental. CrysAlisPro, Agilent Technologies, Version 1.171.35.11 Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. (CrysAlisPro; Oxford Diffraction, 2009) Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc.and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger. The H atom was located from difference Fourier syntheses and its position and isotropic displacement parameter refined freely.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq