
Acta Cryst. (2008). E64, o679-o680 [ doi:10.1107/S1600536808005825 ]
In the title compound, C13H9N5O7, one of the nitro groups is twisted away from the attached benzene ring by 16.21 (8)°. The dihedral angle between the two benzene rings is 4.63 (1)°. The molecular structure is stabilized by intramolecular N-H
O and O-H
N hydrogen bonds which generate an S(6) ring motif. The molecules pack as layers parallel to the ab plane; molecules of adjacent layers are linked into chains along the [101] direction through N-H
O hydrogen bonds.
2,4-Dinitrophenylhydrazine (400 mg, 2 mmol) in concentrated sulfuric acid (5 ml) was slowly added to a solution of 2-hydroxy-5-nitrobenzaldehyde (337 mg, 2 mmol) in ethanol (95%, 20 ml). The mixture was stirred for 15 min, and was left to stand at room temperature for 30 min. The resulting product was filtered and washed with 95% ethanol (20 ml) and the orange powder product was collected. Crystals suitable for X-ray diffraction analysis were grown by slow evaporation of a saturated solution of the resulted compound in ethanol.
O– and N-bound H atoms were located in a difference map and refined isotropically. The remaining H atoms were placed in calculated positions (C—H = 0.93 Å) and refined using a riding model, with Uiso(H) = 1.2Ueq(C).
Data collection: APEX2 (Bruker, 2005); cell refinement: APEX2 (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2003).
| C13H9N5O7 | F000 = 712 |
| Mr = 347.25 | Dx = 1.726 Mg m−3 |
| Monoclinic, P21/n | Mo Kα radiation λ = 0.71073 Å |
| Hall symbol: -P 2yn | Cell parameters from 3255 reflections |
| a = 12.7543 (5) Å | θ = 2.8–33.1º |
| b = 8.1898 (3) Å | µ = 0.14 mm−1 |
| c = 13.8618 (5) Å | T = 100.0 (1) K |
| β = 112.683 (2)º | Block, orange |
| V = 1335.94 (9) Å3 | 0.29 × 0.27 × 0.11 mm |
| Z = 4 |
| Bruker SMART APEXII CCD area-detector diffractometer | 3513 reflections with I > 2σ(I) |
| Detector resolution: 8.33 pixels mm-1 | Rint = 0.056 |
| ω scans | θmax = 33.4º |
| Absorption correction: multi-scan (SADABS; Bruker, 2005) | θmin = 2.8º |
| Tmin = 0.960, Tmax = 0.985 | h = −19→19 |
| 24539 measured reflections | k = −10→12 |
| 5195 independent reflections | l = −21→20 |
| Refinement on F2 | H atoms treated by a mixture of independent and constrained refinement |
| Least-squares matrix: full | w = 1/[σ2(Fo2) + (0.0708P)2 + 0.0132P] where P = (Fo2 + 2Fc2)/3 |
| R[F2 > 2σ(F2)] = 0.050 | (Δ/σ)max = 0.001 |
| wR(F2) = 0.145 | Δρmax = 0.47 e Å−3 |
| S = 1.09 | Δρmin = −0.33 e Å−3 |
| 5195 reflections | Extinction correction: none |
| 234 parameters |
| C13H9N5O7 | V = 1335.94 (9) Å3 |
| Mr = 347.25 | Z = 4 |
| Monoclinic, P21/n | Mo Kα |
| a = 12.7543 (5) Å | µ = 0.14 mm−1 |
| b = 8.1898 (3) Å | T = 100.0 (1) K |
| c = 13.8618 (5) Å | 0.29 × 0.27 × 0.11 mm |
| β = 112.683 (2)º |
| Bruker SMART APEXII CCD area-detector diffractometer | 5195 independent reflections |
| Absorption correction: multi-scan (SADABS; Bruker, 2005) | 3513 reflections with I > 2σ(I) |
| Tmin = 0.960, Tmax = 0.985 | Rint = 0.056 |
| 24539 measured reflections |
| R[F2 > 2σ(F2)] = 0.050 | 234 parameters |
| wR(F2) = 0.145 | H atoms treated by a mixture of independent and constrained refinement |
| S = 1.09 | Δρmax = 0.47 e Å−3 |
| 5195 reflections | Δρmin = −0.33 e Å−3 |
Geometry. Experimental. The low-temperature data was collected with the Oxford Crysosystem Cobra low-temperature attachement. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
| x | y | z | Uiso*/Ueq | ||
| O1 | 0.71240 (8) | 0.91583 (13) | 0.22343 (8) | 0.0228 (2) | |
| O2 | 0.61439 (9) | 1.12841 (14) | 0.22968 (8) | 0.0282 (2) | |
| O3 | 0.39947 (10) | 1.41385 (15) | −0.08171 (9) | 0.0340 (3) | |
| O4 | 0.45224 (10) | 1.41148 (14) | −0.21219 (8) | 0.0307 (3) | |
| O5 | 0.94762 (8) | 0.81549 (12) | −0.11896 (7) | 0.0189 (2) | |
| O6 | 1.34597 (9) | 0.33913 (14) | 0.11735 (8) | 0.0300 (3) | |
| O7 | 1.29887 (9) | 0.41281 (13) | 0.24496 (8) | 0.0259 (2) | |
| N1 | 0.80661 (9) | 0.91651 (14) | 0.08340 (9) | 0.0164 (2) | |
| N2 | 0.87737 (9) | 0.86266 (13) | 0.03680 (8) | 0.0157 (2) | |
| N3 | 0.66026 (9) | 1.04241 (14) | 0.18460 (8) | 0.0187 (2) | |
| N4 | 0.46053 (10) | 1.36459 (15) | −0.12555 (9) | 0.0208 (2) | |
| N5 | 1.28791 (9) | 0.41996 (14) | 0.15301 (9) | 0.0184 (2) | |
| C1 | 0.64902 (11) | 1.08800 (16) | 0.07968 (9) | 0.0160 (2) | |
| C2 | 0.56488 (11) | 1.20121 (16) | 0.02874 (10) | 0.0179 (2) | |
| H2A | 0.5209 | 1.2465 | 0.062 | 0.021* | |
| C3 | 0.54779 (10) | 1.24505 (16) | −0.07199 (10) | 0.0172 (2) | |
| C4 | 0.61284 (11) | 1.17695 (16) | −0.12363 (10) | 0.0171 (2) | |
| H4A | 0.5993 | 1.2067 | −0.1921 | 0.02* | |
| C5 | 0.69644 (11) | 1.06624 (16) | −0.07233 (10) | 0.0165 (2) | |
| H5A | 0.7392 | 1.0211 | −0.1069 | 0.02* | |
| C6 | 0.71925 (10) | 1.01896 (15) | 0.03210 (9) | 0.0150 (2) | |
| C7 | 0.96469 (10) | 0.78013 (15) | 0.09632 (9) | 0.0151 (2) | |
| H7A | 0.9782 | 0.7678 | 0.1668 | 0.018* | |
| C8 | 1.04195 (10) | 0.70636 (15) | 0.05474 (9) | 0.0142 (2) | |
| C9 | 1.03109 (10) | 0.72528 (15) | −0.05001 (9) | 0.0151 (2) | |
| C10 | 1.10725 (11) | 0.64726 (16) | −0.08556 (10) | 0.0168 (2) | |
| H10A | 1.1009 | 0.6634 | −0.154 | 0.02* | |
| C11 | 1.19152 (10) | 0.54678 (16) | −0.02006 (10) | 0.0169 (2) | |
| H11A | 1.2412 | 0.4933 | −0.044 | 0.02* | |
| C12 | 1.20051 (10) | 0.52732 (15) | 0.08265 (10) | 0.0159 (2) | |
| C13 | 1.12875 (10) | 0.60635 (15) | 0.12052 (10) | 0.0153 (2) | |
| H13A | 1.1382 | 0.593 | 0.19 | 0.018* | |
| H1N1 | 0.8262 (16) | 0.891 (2) | 0.1508 (16) | 0.038 (5)* | |
| H1O5 | 0.905 (2) | 0.854 (3) | −0.082 (2) | 0.067 (8)* |
| U11 | U22 | U33 | U12 | U13 | U23 | |
| O1 | 0.0238 (5) | 0.0253 (5) | 0.0220 (5) | 0.0056 (4) | 0.0118 (4) | 0.0049 (4) |
| O2 | 0.0377 (6) | 0.0307 (6) | 0.0253 (5) | 0.0079 (5) | 0.0222 (5) | −0.0004 (4) |
| O3 | 0.0317 (6) | 0.0461 (7) | 0.0298 (6) | 0.0207 (5) | 0.0181 (5) | 0.0077 (5) |
| O4 | 0.0379 (6) | 0.0342 (6) | 0.0228 (5) | 0.0153 (5) | 0.0150 (5) | 0.0087 (4) |
| O5 | 0.0201 (4) | 0.0210 (5) | 0.0162 (4) | 0.0047 (4) | 0.0076 (3) | 0.0023 (3) |
| O6 | 0.0284 (5) | 0.0335 (6) | 0.0285 (5) | 0.0145 (5) | 0.0114 (4) | 0.0014 (4) |
| O7 | 0.0269 (5) | 0.0307 (6) | 0.0197 (5) | 0.0070 (4) | 0.0086 (4) | 0.0059 (4) |
| N1 | 0.0163 (5) | 0.0196 (5) | 0.0155 (5) | 0.0030 (4) | 0.0085 (4) | 0.0005 (4) |
| N2 | 0.0158 (5) | 0.0157 (5) | 0.0177 (5) | 0.0000 (4) | 0.0089 (4) | −0.0017 (4) |
| N3 | 0.0193 (5) | 0.0220 (6) | 0.0183 (5) | −0.0015 (4) | 0.0112 (4) | −0.0006 (4) |
| N4 | 0.0209 (5) | 0.0224 (6) | 0.0204 (5) | 0.0049 (4) | 0.0097 (4) | 0.0004 (4) |
| N5 | 0.0170 (5) | 0.0177 (5) | 0.0203 (5) | 0.0010 (4) | 0.0070 (4) | 0.0005 (4) |
| C1 | 0.0177 (5) | 0.0183 (6) | 0.0144 (5) | −0.0009 (4) | 0.0088 (4) | −0.0011 (4) |
| C2 | 0.0176 (5) | 0.0191 (6) | 0.0195 (6) | 0.0006 (5) | 0.0099 (5) | −0.0033 (5) |
| C3 | 0.0161 (5) | 0.0174 (6) | 0.0194 (6) | 0.0029 (5) | 0.0081 (5) | 0.0005 (4) |
| C4 | 0.0194 (6) | 0.0174 (6) | 0.0158 (5) | −0.0005 (5) | 0.0085 (4) | −0.0005 (4) |
| C5 | 0.0169 (5) | 0.0185 (6) | 0.0160 (5) | 0.0001 (5) | 0.0085 (4) | −0.0023 (4) |
| C6 | 0.0147 (5) | 0.0150 (6) | 0.0163 (5) | −0.0019 (4) | 0.0070 (4) | −0.0017 (4) |
| C7 | 0.0161 (5) | 0.0151 (6) | 0.0158 (5) | −0.0009 (4) | 0.0081 (4) | −0.0004 (4) |
| C8 | 0.0151 (5) | 0.0143 (5) | 0.0142 (5) | −0.0009 (4) | 0.0068 (4) | −0.0013 (4) |
| C9 | 0.0156 (5) | 0.0142 (6) | 0.0156 (5) | −0.0007 (4) | 0.0062 (4) | −0.0002 (4) |
| C10 | 0.0190 (6) | 0.0181 (6) | 0.0156 (5) | −0.0011 (5) | 0.0093 (4) | −0.0010 (4) |
| C11 | 0.0159 (5) | 0.0174 (6) | 0.0200 (6) | −0.0012 (4) | 0.0096 (5) | −0.0024 (4) |
| C12 | 0.0134 (5) | 0.0140 (6) | 0.0190 (6) | 0.0010 (4) | 0.0048 (4) | 0.0005 (4) |
| C13 | 0.0160 (5) | 0.0147 (6) | 0.0161 (5) | −0.0009 (4) | 0.0072 (4) | 0.0000 (4) |
| O1—N3 | 1.2372 (15) | C2—H2A | 0.93 |
| O2—N3 | 1.2291 (15) | C3—C4 | 1.4035 (18) |
| O3—N4 | 1.2262 (15) | C4—C5 | 1.3711 (18) |
| O4—N4 | 1.2259 (15) | C4—H4A | 0.93 |
| O5—C9 | 1.3446 (15) | C5—C6 | 1.4159 (17) |
| O5—H1O5 | 0.92 (3) | C5—H5A | 0.93 |
| O6—N5 | 1.2302 (15) | C7—C8 | 1.4514 (17) |
| O7—N5 | 1.2288 (14) | C7—H7A | 0.93 |
| N1—C6 | 1.3565 (16) | C8—C13 | 1.3962 (17) |
| N1—N2 | 1.3697 (15) | C8—C9 | 1.4128 (16) |
| N1—H1N1 | 0.89 (2) | C9—C10 | 1.4014 (18) |
| N2—C7 | 1.2920 (16) | C10—C11 | 1.3799 (18) |
| N3—C1 | 1.4541 (16) | C10—H10A | 0.93 |
| N4—C3 | 1.4530 (17) | C11—C12 | 1.3927 (17) |
| N5—C12 | 1.4589 (16) | C11—H11A | 0.93 |
| C1—C2 | 1.3876 (18) | C12—C13 | 1.3795 (17) |
| C1—C6 | 1.4187 (17) | C13—H13A | 0.93 |
| C2—C3 | 1.3753 (17) | ||
| C9—O5—H1O5 | 105.4 (15) | C4—C5—H5A | 119.2 |
| C6—N1—N2 | 120.62 (11) | C6—C5—H5A | 119.2 |
| C6—N1—H1N1 | 122.4 (13) | N1—C6—C5 | 120.57 (11) |
| N2—N1—H1N1 | 116.6 (13) | N1—C6—C1 | 122.75 (11) |
| C7—N2—N1 | 115.45 (10) | C5—C6—C1 | 116.66 (11) |
| O2—N3—O1 | 122.71 (11) | N2—C7—C8 | 120.94 (11) |
| O2—N3—C1 | 118.60 (11) | N2—C7—H7A | 119.5 |
| O1—N3—C1 | 118.64 (11) | C8—C7—H7A | 119.5 |
| O4—N4—O3 | 123.45 (12) | C13—C8—C9 | 118.32 (11) |
| O4—N4—C3 | 118.12 (11) | C13—C8—C7 | 118.27 (11) |
| O3—N4—C3 | 118.43 (11) | C9—C8—C7 | 123.37 (11) |
| O7—N5—O6 | 123.08 (11) | O5—C9—C10 | 117.82 (11) |
| O7—N5—C12 | 118.31 (11) | O5—C9—C8 | 121.85 (11) |
| O6—N5—C12 | 118.60 (11) | C10—C9—C8 | 120.32 (11) |
| C2—C1—C6 | 122.19 (11) | C11—C10—C9 | 120.67 (11) |
| C2—C1—N3 | 116.05 (11) | C11—C10—H10A | 119.7 |
| C6—C1—N3 | 121.76 (11) | C9—C10—H10A | 119.7 |
| C3—C2—C1 | 118.67 (12) | C10—C11—C12 | 118.49 (12) |
| C3—C2—H2A | 120.7 | C10—C11—H11A | 120.8 |
| C1—C2—H2A | 120.7 | C12—C11—H11A | 120.8 |
| C2—C3—C4 | 121.38 (12) | C13—C12—C11 | 122.02 (11) |
| C2—C3—N4 | 119.01 (11) | C13—C12—N5 | 118.45 (11) |
| C4—C3—N4 | 119.61 (11) | C11—C12—N5 | 119.53 (11) |
| C5—C4—C3 | 119.51 (12) | C12—C13—C8 | 120.14 (11) |
| C5—C4—H4A | 120.2 | C12—C13—H13A | 119.9 |
| C3—C4—H4A | 120.2 | C8—C13—H13A | 119.9 |
| C4—C5—C6 | 121.55 (12) | ||
| C6—N1—N2—C7 | 172.84 (11) | C2—C1—C6—C5 | −2.48 (18) |
| O2—N3—C1—C2 | −15.33 (17) | N3—C1—C6—C5 | 176.74 (11) |
| O1—N3—C1—C2 | 162.33 (11) | N1—N2—C7—C8 | 175.64 (11) |
| O2—N3—C1—C6 | 165.40 (12) | N2—C7—C8—C13 | −174.24 (11) |
| O1—N3—C1—C6 | −16.94 (18) | N2—C7—C8—C9 | 3.12 (19) |
| C6—C1—C2—C3 | 1.35 (19) | C13—C8—C9—O5 | 177.95 (11) |
| N3—C1—C2—C3 | −177.92 (11) | C7—C8—C9—O5 | 0.58 (19) |
| C1—C2—C3—C4 | 0.5 (2) | C13—C8—C9—C10 | −1.09 (18) |
| C1—C2—C3—N4 | −179.46 (11) | C7—C8—C9—C10 | −178.46 (11) |
| O4—N4—C3—C2 | 174.55 (13) | O5—C9—C10—C11 | −176.95 (11) |
| O3—N4—C3—C2 | −5.12 (19) | C8—C9—C10—C11 | 2.12 (19) |
| O4—N4—C3—C4 | −5.37 (19) | C9—C10—C11—C12 | −1.25 (19) |
| O3—N4—C3—C4 | 174.96 (13) | C10—C11—C12—C13 | −0.63 (19) |
| C2—C3—C4—C5 | −1.0 (2) | C10—C11—C12—N5 | 179.16 (11) |
| N4—C3—C4—C5 | 178.90 (11) | O7—N5—C12—C13 | −4.77 (17) |
| C3—C4—C5—C6 | −0.22 (19) | O6—N5—C12—C13 | 174.17 (12) |
| N2—N1—C6—C5 | 2.89 (18) | O7—N5—C12—C11 | 175.44 (12) |
| N2—N1—C6—C1 | −175.04 (11) | O6—N5—C12—C11 | −5.62 (18) |
| C4—C5—C6—N1 | −176.16 (12) | C11—C12—C13—C8 | 1.65 (19) |
| C4—C5—C6—C1 | 1.89 (18) | N5—C12—C13—C8 | −178.14 (11) |
| C2—C1—C6—N1 | 175.52 (12) | C9—C8—C13—C12 | −0.75 (18) |
| N3—C1—C6—N1 | −5.25 (19) | C7—C8—C13—C12 | 176.75 (11) |
| D—H···A | D—H | H···A | D···A | D—H···A |
| N1—H1N1···O4i | 0.89 (2) | 2.54 (2) | 3.0666 (15) | 118 (2) |
| N1—H1N1···O1 | 0.89 (2) | 2.07 (2) | 2.6477 (15) | 121 (2) |
| O5—H1O5···N2 | 0.92 (3) | 1.82 (3) | 2.6656 (14) | 150 (2) |
| Symmetry codes: (i) x+1/2, −y+5/2, z+1/2. |
| D—H···A | D—H | H···A | D···A | D—H···A |
| N1—H1N1···O4i | 0.89 (2) | 2.54 (2) | 3.0666 (15) | 118 (2) |
| N1—H1N1···O1 | 0.89 (2) | 2.07 (2) | 2.6477 (15) | 121 (2) |
| O5—H1O5···N2 | 0.92 (3) | 1.82 (3) | 2.6656 (14) | 150 (2) |
| Symmetry codes: (i) x+1/2, −y+5/2, z+1/2. |
FHK and SRJ thank the Malaysian Government and Universiti Sains Malaysia for the Science Fund grant No. 305/PFIZIK/613312. SRJ thanks the Universiti Sains Malaysia for the award of a post-doctoral research fellowship.
Bernstein, J., Davis, R. E., Shimoni, L. & Chang, N. L. (1995). Angew. Chem. Int. Ed. Engl. 34, 1555–1573.
Bruker (2005). APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.
Cordis, G. A., Das, D. K. & Riedel, W. (1998). J. Chromatogr. A, 798, 117–123.
Fun, H.-K., Sivakumar, K., Lu, Z.-L., Duan, C.-Y., Tian, Y.-P. & You, X.-Z. (1996). Acta Cryst. C52, 986–988.
Guillaumont, D. & Nakamura, S. (2000). Dyes Pigm. 46, 85–92.
Hanoune, B., Bris, T. L., Allou, L., Marchand, C. & Calve, S. L. (2006). Atmos. Environ. 40, 5768–5775.
Lamberton, J. A., Nelson, E. R. & Triffett, C. K. (1974). Aust. J. Chem. 27, 1521–1529.
Niknam, K., Kiasat, A. R. & Karimi, S. (2005). Synth. Commun. 35, 2231–2236.
Raj, B. N. B. & Kurup, M. R. P. (2007). Spectrochim. Acta Part A, 66, 898–903.
Salhin, A., Tameem, A. A., Saad, B., Ng, S.-L. & Fun, H.-K. (2007). Acta Cryst. E63, o2880–?.
Shan, S., Xu, D.-J. & Hu, W.-X. (2003). Acta Cryst. E59, o1173–o1174.
Shan, S., Yu, H.-G., Hu, W.-X. & Xu, D.-J. (2003). Acta Cryst. E59, o1886–o1887.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.
Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13.
Tameem, A. A., Salhin, A., Saad, B., Ng, S.-L. & Fun, H.-K. (2007). Acta Cryst. E63, o2502–?.
Uchiyama, S., Ando, M. & Aoyagi, S. (2003). J. Chromatogr. A996, 95–102.
Vogel, M., Potter, W. & Karst, U. (2000). J. Chromatogr. A886, 303–307.
Zegota, H. (1999). J. Chromatogr. A863, 227–233.
Zlotorzynska, E. D. & Lai, E. P. C. (1999). J. Chromatogr. A853, 487–796.
Phenylhydrazone derivatives have been synthesized in order to investigate their structures and analytical applications. 2,4-Dinitrophenylhydrazones play an important role as stabilizers for the detection, characterization and protection of the carbonyl group of compounds than phenylhydrazones (Niknam et al., 2005). 2,4-Dinitrophenylhydrazone derivatives are widely used in various forms of analytical chemistry (Lamberton et al., 1974; Zegota, 1999; Cordis et al., 1998; Zlotorzynska & Lai, 1999) and are also used as dyes (Guillaumont & Nakamura, 2000). They are also found to have versatile coordinating abilities towards different metal ions (Raj et al., 2006). In addition, they are used to determine airborne aldehydes and ketones (Vogel et al., 2000) and as detectors of formaldehyde (Hanoune et al., 2006). These compounds can exist as E and Z stereoisomers (Uchiyama et al., 2003). Their existence as a keto tautomer in the solid state with an E configuration across the C—N bond have been reported (Fun et al., 1996). The title compound, whose structure is reported here, is one of the series of phenylhydrazone derivatives that we have prepared; the crystal structures of some of these compounds have been studied previously (Tameem et al., 2007; Salhin et al., 2007).
The bond lengths and angles in the title compound (Fig.1) have normal values. The molecule is nealy planar, with a maximum deviation from the mean plane of 0.487 (1) Å for atom O1. The dihedral angle between the two benzene rings is 4.63 (1)°. The C—N bond lengths in the hydrazone moiety agree well with those reported earlier (Shan, Xu et al., 2003; Shan, Yu et al., 2003). The asymmetry of the exocyclic angles at C7 [C7—C8—C13 = 118.2 (2)° and C7—C8—C9 = 123.3 (2)°] is more pronounced than that at C6 [N1—C6—C1 = 122.7 (1)° and N1—C6—C5 = 120.5 (1)°]. One of the hydrazone N atoms is involved in an O—H···N intramolecular hydrogen bond with the hydroxy group, while the other is involved in an N—H···O intramolecular hydrogen bond with the nitro group. Each of these hydrogen bonds generate an S(6) ring motif (Bernstein et al.,1995).
The molecules are linked into a chain along the [1 0 1] direction through N—H—O hydrogen bonds. The molecules pack as layers parallel to the ab plane. Within the layer, weak π-π interactions are observed between the C1—C6 and C8—C13 benzene rings, with a centroid-centroid distance of 3.7457 (8) Å.