organic compounds
N-[(2-Chlorophenyl)sulfonyl]-3-nitrobenzamide
aDepartment of Studies and Research in Chemistry, Tumkur University, Tumkur, Karnataka 572 103, India, bUniversity College of Science, Tumkur University, Tumkur, India, cDepartment of Studies and Research in Physics, U.C.S., Tumkur University, Tumkur, Karnataka 572 103, India, and dDepartment of Chemistry, University College of Science, Tumkur University, Tumkur 572 103, India
*Correspondence e-mail: pasuchetan@yahoo.co.in
In the title compound, C13H9ClN2O5S, the dihedral angle between the benzene rings is 74.86 (11)°. The molecule is twisted at the S atom, with a dihedral angle of 82.53 (13)° between the sulfonyl benzene ring and the S—N—C=O segment. In the crystal, molecules are linked into inversion dimers through pairs of N—H⋯O hydrogen bonds, thereby forming R22(8) loops. Molecules are linked into C(7) [010] chains by weak C—H⋯O hydrogen bonds, and C—H⋯π interactions are also observed.
Related literature
For similar structures, see: Gowda et al. (2009, 2010); Suchetan et al. (2011, 2012).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2009); cell APEX2 and SAINT-Plus (Bruker, 2009); data reduction: SAINT-Plus and XPREP (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536813015912/hb7091sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536813015912/hb7091Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536813015912/hb7091Isup3.cml
The title compound was prepared by refluxing a mixture of 3-nitrobenzoic acid, 2-chlorobenzene sulfonamide and phosphorous oxy chloride for 2 h on a water bath. The resultant mixture was cooled and poured into ice cold water. The Solid obtained was filtered and washed thoroughly with water and then dissolved in sodium bicarbonate solution. The compound was later reprecipitated by acidifying the filtered solution with dilute HCl. The filtered and dried solid was recrystallized to the constant melting point (483 K).
Colorless prisms of (I) were obtained from a slow evaporation of its ethanolic solution at room temperature.
The H atom of the NH group was located in a difference map and later restained to N—H = 0.81 (2) Å. The other H atoms were positioned with idealized geometry using a riding model with C—H = 0.93 Å. All H atoms were refined with isotropic displacement parameters (set to 1.2 times of the Ueq of the parent atom).
Diaryl acylsulfonamides are known as potent anti-tumor agents against a broad spectrum of human tumor xenografts (colon, lung, breast, ovary, and prostate) in nude mice. As part of our studies in this area, the structure of the title compound, (I), was determined.
In the title compound, C13H9ClN2O5S (I), the conformation of the N—H bond in the C—SO2—NH—C(O) segment is anti to the C=O bond. In the molecule, the conformation between the N—H bond and the ortho-chloro group in the sulfonyl benzene ring is syn. Similarly, the conformation between the N—H bond and the meta-nitro group in the benzoyl ring is syn. The dihedral angle between the two benzene rings is 74.86 (11)°, compared to the value of 80.3 (1)° in N-(benzoyl)-benzenesulfonamide (Gowda et al. 2009), 86.9 (2)o N-(3-nitrobenzoyl)-benzenesulfonamide (Suchetan et al. 2012), 73.3 (1)° in N-benzoyl-2-chlorobenzenesulfonamide (Gowda et al. 2010) and 85.4 (1)o in 2-chloro-N-(4-nitrobenzoyl)benzenesulfonamide (Suchetan et al. 2011). In the crystal, the molecules are linked into inversion dimers through N—H···O hydrogen bonds forming a R22(8) motif. The molecules are further linked along [010] through a weak C—H···O intermolecular interaction into C(7) chains. C—H···Cg (where Cg is the centroid of the nitrobenzene ring) interactions are also observed in the crystal structure.
For similar structures, see: Gowda et al. (2009, 2010); Suchetan et al. (2011, 2012).
Data collection: APEX2 (Bruker, 2009); cell
APEX2 and SAINT-Plus (Bruker, 2009); data reduction: SAINT-Plus and XPREP (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. Molecular structure of the title compound, showing displacement ellipsoids drawn at the 50% probability level. | |
Fig. 2. Molecular packing of (I) with hydrogen bonding shown as dashed lines. Carbon bounded hydrogen atoms are ommitted for clarity. | |
Fig. 3. Display of C—H···O interactions among molecules along b axis forming C(7) chains. | |
Fig. 4. Stacking of molecules along b axis through C—H···Cg interactions. Cg is the centroid of the nitrobenzene ring |
C13H9ClN2O5S | Prism |
Mr = 340.73 | Dx = 1.577 Mg m−3 |
Orthorhombic, Pbca | Melting point: 483 K |
Hall symbol: -P 2ac 2ab | Mo Kα radiation, λ = 0.71073 Å |
a = 12.290 (8) Å | Cell parameters from 456 reflections |
b = 13.548 (9) Å | θ = 2.4–25.0° |
c = 17.240 (11) Å | µ = 0.44 mm−1 |
V = 2870 (3) Å3 | T = 298 K |
Z = 8 | Prism, colourless |
F(000) = 1392 | 0.32 × 0.26 × 0.18 mm |
Bruker APEXII diffractometer | 2170 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.059 |
Graphite monochromator | θmax = 25.0°, θmin = 2.4° |
phi and ω scans | h = −14→14 |
22957 measured reflections | k = −16→16 |
2523 independent reflections | l = −20→20 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.039 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.095 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0417P)2 + 1.3036P] where P = (Fo2 + 2Fc2)/3 |
2523 reflections | (Δ/σ)max = 0.009 |
203 parameters | Δρmax = 0.19 e Å−3 |
0 restraints | Δρmin = −0.34 e Å−3 |
C13H9ClN2O5S | V = 2870 (3) Å3 |
Mr = 340.73 | Z = 8 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 12.290 (8) Å | µ = 0.44 mm−1 |
b = 13.548 (9) Å | T = 298 K |
c = 17.240 (11) Å | 0.32 × 0.26 × 0.18 mm |
Bruker APEXII diffractometer | 2170 reflections with I > 2σ(I) |
22957 measured reflections | Rint = 0.059 |
2523 independent reflections |
R[F2 > 2σ(F2)] = 0.039 | 0 restraints |
wR(F2) = 0.095 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.06 | Δρmax = 0.19 e Å−3 |
2523 reflections | Δρmin = −0.34 e Å−3 |
203 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
H1N1 | −0.0482 (19) | 0.0080 (17) | 0.5829 (13) | 0.038 (7)* | |
Cl | −0.15389 (6) | 0.15122 (5) | 0.47697 (4) | 0.0619 (2) | |
O1 | 0.14765 (12) | 0.14055 (11) | 0.63851 (9) | 0.0459 (4) | |
O2 | 0.08993 (13) | 0.09375 (11) | 0.50819 (9) | 0.0417 (4) | |
O3 | −0.04676 (15) | 0.10265 (12) | 0.73735 (9) | 0.0500 (4) | |
C7 | −0.06345 (17) | 0.03864 (15) | 0.69067 (12) | 0.0360 (5) | |
C1 | −0.01089 (17) | 0.23801 (15) | 0.57672 (11) | 0.0326 (5) | |
N1 | −0.02055 (16) | 0.04195 (13) | 0.61651 (11) | 0.0372 (5) | |
C9 | −0.10982 (18) | −0.13960 (15) | 0.66930 (12) | 0.0354 (5) | |
H9 | −0.0518 | −0.1458 | 0.6350 | 0.042* | |
C2 | −0.09947 (18) | 0.24942 (17) | 0.52799 (12) | 0.0406 (5) | |
C8 | −0.13061 (17) | −0.05097 (15) | 0.70592 (11) | 0.0333 (5) | |
O4 | −0.21793 (19) | −0.37931 (13) | 0.65266 (13) | 0.0796 (7) | |
N2 | −0.15398 (19) | −0.31165 (14) | 0.64382 (12) | 0.0524 (6) | |
C3 | −0.1469 (2) | 0.3409 (2) | 0.51955 (15) | 0.0565 (7) | |
H3 | −0.2065 | 0.3487 | 0.4868 | 0.068* | |
C12 | −0.2825 (2) | −0.12449 (18) | 0.77063 (14) | 0.0471 (6) | |
H12 | −0.3407 | −0.1189 | 0.8048 | 0.057* | |
C13 | −0.21677 (19) | −0.04398 (17) | 0.75771 (12) | 0.0427 (6) | |
H13 | −0.2300 | 0.0150 | 0.7836 | 0.051* | |
C10 | −0.17671 (19) | −0.21855 (15) | 0.68463 (12) | 0.0378 (5) | |
C5 | −0.0202 (2) | 0.40986 (18) | 0.60766 (16) | 0.0587 (7) | |
H5 | 0.0062 | 0.4642 | 0.6347 | 0.070* | |
C6 | 0.0285 (2) | 0.31882 (16) | 0.61681 (14) | 0.0452 (6) | |
H6 | 0.0878 | 0.3119 | 0.6499 | 0.054* | |
O5 | −0.0744 (2) | −0.31613 (14) | 0.60277 (13) | 0.0822 (7) | |
C11 | −0.2639 (2) | −0.21325 (18) | 0.73390 (13) | 0.0443 (6) | |
H11 | −0.3089 | −0.2674 | 0.7423 | 0.053* | |
C4 | −0.1068 (2) | 0.4203 (2) | 0.55921 (16) | 0.0629 (8) | |
H4 | −0.1389 | 0.4820 | 0.5530 | 0.076* | |
S1 | 0.06284 (4) | 0.12695 (4) | 0.58416 (3) | 0.03356 (17) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl | 0.0569 (4) | 0.0694 (5) | 0.0596 (4) | −0.0047 (3) | −0.0229 (3) | −0.0149 (3) |
O1 | 0.0407 (9) | 0.0430 (9) | 0.0540 (10) | −0.0002 (7) | −0.0146 (8) | 0.0011 (7) |
O2 | 0.0465 (9) | 0.0391 (8) | 0.0394 (9) | −0.0032 (7) | 0.0112 (7) | −0.0044 (7) |
O3 | 0.0670 (12) | 0.0416 (9) | 0.0415 (9) | −0.0036 (8) | 0.0007 (8) | −0.0112 (8) |
C7 | 0.0422 (12) | 0.0328 (11) | 0.0328 (12) | 0.0053 (9) | −0.0023 (10) | −0.0001 (9) |
C1 | 0.0361 (11) | 0.0314 (11) | 0.0301 (11) | −0.0002 (9) | −0.0001 (9) | 0.0002 (9) |
N1 | 0.0493 (12) | 0.0319 (10) | 0.0305 (10) | −0.0089 (9) | 0.0011 (9) | −0.0029 (8) |
C9 | 0.0402 (12) | 0.0358 (12) | 0.0301 (11) | 0.0001 (9) | 0.0034 (10) | 0.0031 (9) |
C2 | 0.0395 (12) | 0.0466 (13) | 0.0356 (12) | 0.0014 (10) | −0.0034 (10) | −0.0027 (10) |
C8 | 0.0407 (12) | 0.0326 (11) | 0.0267 (11) | 0.0025 (9) | −0.0007 (9) | 0.0039 (8) |
O4 | 0.1089 (17) | 0.0447 (11) | 0.0853 (15) | −0.0325 (11) | 0.0239 (13) | −0.0087 (10) |
N2 | 0.0765 (16) | 0.0340 (11) | 0.0467 (12) | −0.0083 (11) | 0.0071 (12) | 0.0016 (9) |
C3 | 0.0521 (16) | 0.0654 (18) | 0.0521 (16) | 0.0171 (13) | −0.0112 (13) | 0.0027 (13) |
C12 | 0.0413 (13) | 0.0607 (16) | 0.0392 (13) | 0.0037 (12) | 0.0109 (11) | 0.0101 (11) |
C13 | 0.0540 (14) | 0.0412 (12) | 0.0331 (12) | 0.0089 (11) | 0.0054 (11) | 0.0042 (10) |
C10 | 0.0467 (13) | 0.0345 (11) | 0.0321 (11) | −0.0027 (10) | −0.0023 (10) | 0.0030 (9) |
C5 | 0.084 (2) | 0.0343 (13) | 0.0581 (17) | 0.0027 (13) | −0.0037 (15) | −0.0073 (12) |
C6 | 0.0565 (15) | 0.0357 (12) | 0.0433 (14) | −0.0024 (11) | −0.0087 (11) | −0.0038 (10) |
O5 | 0.1074 (18) | 0.0453 (11) | 0.0940 (16) | −0.0102 (11) | 0.0529 (14) | −0.0155 (10) |
C11 | 0.0459 (14) | 0.0475 (14) | 0.0395 (12) | −0.0067 (11) | 0.0023 (11) | 0.0109 (11) |
C4 | 0.079 (2) | 0.0454 (15) | 0.0646 (18) | 0.0224 (14) | 0.0006 (16) | 0.0020 (13) |
S1 | 0.0352 (3) | 0.0302 (3) | 0.0353 (3) | −0.0017 (2) | −0.0007 (2) | −0.0008 (2) |
Cl—C2 | 1.729 (2) | O4—N2 | 1.217 (3) |
O1—S1 | 1.4137 (17) | N2—O5 | 1.209 (3) |
O2—S1 | 1.4243 (17) | N2—C10 | 1.471 (3) |
O3—C7 | 1.201 (3) | C3—C4 | 1.367 (4) |
C7—N1 | 1.384 (3) | C3—H3 | 0.9300 |
C7—C8 | 1.491 (3) | C12—C13 | 1.376 (3) |
C1—C6 | 1.382 (3) | C12—C11 | 1.378 (3) |
C1—C2 | 1.384 (3) | C12—H12 | 0.9300 |
C1—S1 | 1.761 (2) | C13—H13 | 0.9300 |
N1—S1 | 1.639 (2) | C10—C11 | 1.370 (3) |
N1—H1N1 | 0.81 (2) | C5—C4 | 1.360 (4) |
C9—C10 | 1.375 (3) | C5—C6 | 1.380 (3) |
C9—C8 | 1.381 (3) | C5—H5 | 0.9300 |
C9—H9 | 0.9300 | C6—H6 | 0.9300 |
C2—C3 | 1.378 (3) | C11—H11 | 0.9300 |
C8—C13 | 1.388 (3) | C4—H4 | 0.9300 |
O3—C7—N1 | 122.1 (2) | C11—C12—H12 | 119.3 |
O3—C7—C8 | 124.3 (2) | C12—C13—C8 | 119.9 (2) |
N1—C7—C8 | 113.60 (18) | C12—C13—H13 | 120.1 |
C6—C1—C2 | 119.4 (2) | C8—C13—H13 | 120.1 |
C6—C1—S1 | 117.40 (17) | C11—C10—C9 | 123.1 (2) |
C2—C1—S1 | 122.98 (16) | C11—C10—N2 | 119.4 (2) |
C7—N1—S1 | 125.13 (16) | C9—C10—N2 | 117.5 (2) |
C7—N1—H1N1 | 118.7 (16) | C4—C5—C6 | 120.2 (2) |
S1—N1—H1N1 | 114.6 (16) | C4—C5—H5 | 119.9 |
C10—C9—C8 | 118.6 (2) | C6—C5—H5 | 119.9 |
C10—C9—H9 | 120.7 | C5—C6—C1 | 119.9 (2) |
C8—C9—H9 | 120.7 | C5—C6—H6 | 120.0 |
C3—C2—C1 | 119.8 (2) | C1—C6—H6 | 120.0 |
C3—C2—Cl | 118.35 (19) | C10—C11—C12 | 117.4 (2) |
C1—C2—Cl | 121.81 (17) | C10—C11—H11 | 121.3 |
C9—C8—C13 | 119.6 (2) | C12—C11—H11 | 121.3 |
C9—C8—C7 | 121.66 (19) | C5—C4—C3 | 120.5 (2) |
C13—C8—C7 | 118.69 (19) | C5—C4—H4 | 119.7 |
O5—N2—O4 | 123.9 (2) | C3—C4—H4 | 119.7 |
O5—N2—C10 | 118.5 (2) | O1—S1—O2 | 118.58 (11) |
O4—N2—C10 | 117.6 (2) | O1—S1—N1 | 109.09 (10) |
C4—C3—C2 | 120.2 (2) | O2—S1—N1 | 103.72 (10) |
C4—C3—H3 | 119.9 | O1—S1—C1 | 108.43 (10) |
C2—C3—H3 | 119.9 | O2—S1—C1 | 108.86 (10) |
C13—C12—C11 | 121.3 (2) | N1—S1—C1 | 107.65 (11) |
C13—C12—H12 | 119.3 | ||
O3—C7—N1—S1 | 4.0 (3) | O4—N2—C10—C11 | 3.8 (3) |
C8—C7—N1—S1 | −175.78 (15) | O5—N2—C10—C9 | 4.4 (3) |
C6—C1—C2—C3 | 0.4 (3) | O4—N2—C10—C9 | −174.4 (2) |
S1—C1—C2—C3 | −173.82 (19) | C4—C5—C6—C1 | −0.1 (4) |
C6—C1—C2—Cl | −179.23 (18) | C2—C1—C6—C5 | −0.3 (3) |
S1—C1—C2—Cl | 6.5 (3) | S1—C1—C6—C5 | 174.2 (2) |
C10—C9—C8—C13 | 0.9 (3) | C9—C10—C11—C12 | −1.6 (3) |
C10—C9—C8—C7 | −178.37 (19) | N2—C10—C11—C12 | −179.7 (2) |
O3—C7—C8—C9 | −149.7 (2) | C13—C12—C11—C10 | 0.7 (3) |
N1—C7—C8—C9 | 30.1 (3) | C6—C5—C4—C3 | 0.5 (4) |
O3—C7—C8—C13 | 31.0 (3) | C2—C3—C4—C5 | −0.4 (4) |
N1—C7—C8—C13 | −149.2 (2) | C7—N1—S1—O1 | 48.2 (2) |
C1—C2—C3—C4 | 0.0 (4) | C7—N1—S1—O2 | 175.44 (18) |
Cl—C2—C3—C4 | 179.6 (2) | C7—N1—S1—C1 | −69.3 (2) |
C11—C12—C13—C8 | 0.9 (4) | C6—C1—S1—O1 | 5.5 (2) |
C9—C8—C13—C12 | −1.7 (3) | C2—C1—S1—O1 | 179.83 (18) |
C7—C8—C13—C12 | 177.6 (2) | C6—C1—S1—O2 | −124.79 (18) |
C8—C9—C10—C11 | 0.8 (3) | C2—C1—S1—O2 | 49.5 (2) |
C8—C9—C10—N2 | 178.95 (19) | C6—C1—S1—N1 | 123.40 (18) |
O5—N2—C10—C11 | −177.3 (2) | C2—C1—S1—N1 | −62.3 (2) |
Cg is the centroid of the nitrobenzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···O2i | 0.81 (2) | 2.15 (2) | 2.954 (3) | 169 (2) |
C11—H11···O3ii | 0.93 | 2.50 | 3.411 (3) | 166 |
C6—H6···Cgiii | 0.93 | 2.72 | 3.550 (3) | 150 |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x−1/2, y−1/2, z; (iii) −x+1, y−1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C13H9ClN2O5S |
Mr | 340.73 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 298 |
a, b, c (Å) | 12.290 (8), 13.548 (9), 17.240 (11) |
V (Å3) | 2870 (3) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.44 |
Crystal size (mm) | 0.32 × 0.26 × 0.18 |
Data collection | |
Diffractometer | Bruker APEXII |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 22957, 2523, 2170 |
Rint | 0.059 |
(sin θ/λ)max (Å−1) | 0.594 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.039, 0.095, 1.06 |
No. of reflections | 2523 |
No. of parameters | 203 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.19, −0.34 |
Computer programs: APEX2 (Bruker, 2009), APEX2 and SAINT-Plus (Bruker, 2009), SAINT-Plus and XPREP (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), Mercury (Macrae et al., 2008).
Cg is the centroid of the nitrobenzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···O2i | 0.81 (2) | 2.15 (2) | 2.954 (3) | 169 (2) |
C11—H11···O3ii | 0.93 | 2.50 | 3.411 (3) | 166 |
C6—H6···Cgiii | 0.93 | 2.72 | 3.550 (3) | 150 |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x−1/2, y−1/2, z; (iii) −x+1, y−1/2, −z+1/2. |
Acknowledgements
PAS thanks the University Grants Commission (UGC), India, for financial support under its Minor Research Project scheme.
References
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Diaryl acylsulfonamides are known as potent anti-tumor agents against a broad spectrum of human tumor xenografts (colon, lung, breast, ovary, and prostate) in nude mice. As part of our studies in this area, the structure of the title compound, (I), was determined.
In the title compound, C13H9ClN2O5S (I), the conformation of the N—H bond in the C—SO2—NH—C(O) segment is anti to the C=O bond. In the molecule, the conformation between the N—H bond and the ortho-chloro group in the sulfonyl benzene ring is syn. Similarly, the conformation between the N—H bond and the meta-nitro group in the benzoyl ring is syn. The dihedral angle between the two benzene rings is 74.86 (11)°, compared to the value of 80.3 (1)° in N-(benzoyl)-benzenesulfonamide (Gowda et al. 2009), 86.9 (2)o N-(3-nitrobenzoyl)-benzenesulfonamide (Suchetan et al. 2012), 73.3 (1)° in N-benzoyl-2-chlorobenzenesulfonamide (Gowda et al. 2010) and 85.4 (1)o in 2-chloro-N-(4-nitrobenzoyl)benzenesulfonamide (Suchetan et al. 2011). In the crystal, the molecules are linked into inversion dimers through N—H···O hydrogen bonds forming a R22(8) motif. The molecules are further linked along [010] through a weak C—H···O intermolecular interaction into C(7) chains. C—H···Cg (where Cg is the centroid of the nitrobenzene ring) interactions are also observed in the crystal structure.