organic compounds
rac-1-(Furan-2-ylmethyl)-N-nitro-5-(oxolan-2-ylmethyl)-1,3,5-triazinan-2-imine
aDepartment of Chemistry, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, People's Republic of China
*Correspondence e-mail: maxubo6688@yahoo.com.cn
In the title compound C13H19N5O4, which belongs to the insecticidally active neonicotinoid group of compounds, the triazane ring exhibits a half-chair conformation. The large discrepancy between the two nitro O—N—N bond angles [116.1 (2) and 123.98 (19)°] may be attributed to intramolecular N—H⋯O hydrogen bonding involving one of the nitro O atoms as the acceptor. The delocalization of the electrons extends as far as the nitro group, forming coplanar π-electron networks. In the crystal, inversion dimers lined by pairs of N—H⋯O hydrogen bonds occur.
Related literature
For general background to neonicotinoids, see: Kagabu et al. (2005); Peter & Ralf (2008); Riley & Merz (2007); Tian et al. (2007); Tomizawa et al. (2000). For the synthesis, see: Zhu et al. (2010).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: SMART (Bruker, 2001); cell SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supporting information
10.1107/S1600536810036561/zs2064sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536810036561/zs2064Isup2.hkl
The title compound was prepared by the literature method (Zhu et al., 2010) and was recrystallized from ethanol-water (10:1), giving colorless crystals (yield 79.6%). 1HNMR(CDCl3, 400 Hz): 9.61 (1H, s, NH), 7.37–7.36 (2H, d, J = 0.8 Hz, furan—H), 6.38–6.34 (3H,m,furan—H), 4.49–4.47(6H, m, CH2—furan, triazine–H), 3.97–3.85 (2H, m, CH2—tetrahydrofuran), 3.53–3.12 (3H, m, tetrahydrofuran—H) 1.86–1.64(4H, m, tetrahydrofuran—H); IR(KBr, cm-1) 3278(N—H), 1588 (C═N), 1195 (C—O—C), 1060 (C—N), Anal.: calcd. for C13H19N5O4: C 50.48, H 6.19, N 22.64%; found, C 51.03, H 6.17, N 22.75%.
H atoms bonded to C were positioned geometrically [C—H = 0.93 Å (aromatic), 0.97 Å (methylene) and 0.98Å (methine)] and refined in riding modes [Uiso(H) = 1.2Ueq(C). H atoms bonded to N were found in Fourier difference maps and refined with the constraints of N—H = 0.82 (3)Å and Uiso(H) = 1.2Ueq(N).
Data collection: SMART (Bruker, 2001); cell
SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).C13H19N5O4 | F(000) = 656 |
Mr = 309.33 | Dx = 1.387 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 4051 reflections |
a = 11.1898 (12) Å | θ = 2.5–28.3° |
b = 9.262 (1) Å | µ = 0.11 mm−1 |
c = 14.4863 (15) Å | T = 298 K |
β = 99.276 (2)° | Block, colorless |
V = 1481.7 (3) Å3 | 0.16 × 0.12 × 0.10 mm |
Z = 4 |
Bruker SMART CCD area-detector diffractometer | 2615 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.054 |
Graphite monochromator | θmax = 26.0°, θmin = 2.1° |
ϕ and ω scans | h = −12→13 |
9196 measured reflections | k = −9→11 |
2902 independent reflections | l = −17→17 |
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)] = 0.066 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.164 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.18 | w = 1/[σ2(Fo2) + (0.0599P)2 + 0.7103P] where P = (Fo2 + 2Fc2)/3 |
2902 reflections | (Δ/σ)max < 0.001 |
202 parameters | Δρmax = 0.34 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
C13H19N5O4 | V = 1481.7 (3) Å3 |
Mr = 309.33 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 11.1898 (12) Å | µ = 0.11 mm−1 |
b = 9.262 (1) Å | T = 298 K |
c = 14.4863 (15) Å | 0.16 × 0.12 × 0.10 mm |
β = 99.276 (2)° |
Bruker SMART CCD area-detector diffractometer | 2615 reflections with I > 2σ(I) |
9196 measured reflections | Rint = 0.054 |
2902 independent reflections |
R[F2 > 2σ(F2)] = 0.066 | 0 restraints |
wR(F2) = 0.164 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.18 | Δρmax = 0.34 e Å−3 |
2902 reflections | Δρmin = −0.21 e Å−3 |
202 parameters |
Geometry. 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. |
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 > σ(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 | ||
C1 | 0.1890 (2) | 1.0871 (3) | −0.01634 (16) | 0.0487 (6) | |
H1 | 0.1262 | 1.0589 | −0.0684 | 0.058* | |
C2 | 0.2996 (3) | 1.1394 (3) | −0.0536 (2) | 0.0696 (8) | |
H2A | 0.3568 | 1.0614 | −0.0561 | 0.084* | |
H2B | 0.2777 | 1.1802 | −0.1157 | 0.084* | |
C3 | 0.3511 (3) | 1.2516 (4) | 0.0146 (2) | 0.0736 (9) | |
H3A | 0.3924 | 1.3257 | −0.0156 | 0.088* | |
H3B | 0.4078 | 1.2094 | 0.0651 | 0.088* | |
C4 | 0.2436 (3) | 1.3124 (3) | 0.0502 (2) | 0.0615 (7) | |
H4A | 0.2630 | 1.3307 | 0.1169 | 0.074* | |
H4B | 0.2191 | 1.4027 | 0.0188 | 0.074* | |
C5 | 0.2134 (2) | 0.9639 (3) | 0.05245 (16) | 0.0473 (6) | |
H5A | 0.2792 | 0.9902 | 0.1017 | 0.057* | |
H5B | 0.1420 | 0.9468 | 0.0809 | 0.057* | |
C6 | 0.1429 (2) | 0.7399 (3) | −0.02488 (15) | 0.0482 (6) | |
H6A | 0.1663 | 0.6655 | −0.0656 | 0.058* | |
H6B | 0.0791 | 0.7970 | −0.0608 | 0.058* | |
C7 | 0.16647 (19) | 0.6493 (2) | 0.13610 (15) | 0.0382 (5) | |
C8 | 0.3341 (2) | 0.7465 (3) | 0.06578 (16) | 0.0476 (6) | |
H8A | 0.4025 | 0.8074 | 0.0900 | 0.057* | |
H8B | 0.3630 | 0.6705 | 0.0290 | 0.057* | |
C9 | 0.3679 (2) | 0.6694 (3) | 0.23428 (16) | 0.0532 (6) | |
H9A | 0.3267 | 0.6217 | 0.2798 | 0.064* | |
H9B | 0.3899 | 0.7657 | 0.2574 | 0.064* | |
C10 | 0.4795 (2) | 0.5882 (3) | 0.22556 (16) | 0.0482 (6) | |
C11 | 0.5939 (2) | 0.6300 (3) | 0.23025 (18) | 0.0540 (6) | |
H11 | 0.6233 | 0.7234 | 0.2408 | 0.065* | |
C12 | 0.6623 (2) | 0.5070 (4) | 0.2163 (2) | 0.0693 (8) | |
H12 | 0.7454 | 0.5036 | 0.2161 | 0.083* | |
C13 | 0.5869 (3) | 0.3982 (4) | 0.2035 (3) | 0.0808 (10) | |
H13 | 0.6081 | 0.3034 | 0.1925 | 0.097* | |
N1 | 0.24528 (17) | 0.8309 (2) | 0.00685 (12) | 0.0440 (5) | |
N2 | 0.09726 (18) | 0.6721 (2) | 0.05406 (13) | 0.0434 (5) | |
H2 | 0.024 (2) | 0.659 (3) | 0.0503 (18) | 0.052* | |
N3 | 0.28447 (16) | 0.6810 (2) | 0.14521 (12) | 0.0442 (5) | |
N4 | 0.13154 (16) | 0.5958 (2) | 0.21520 (13) | 0.0463 (5) | |
N5 | 0.01557 (17) | 0.5609 (2) | 0.21385 (14) | 0.0486 (5) | |
O1 | 0.14841 (15) | 1.20885 (19) | 0.03162 (12) | 0.0540 (5) | |
O2 | 0.47092 (18) | 0.4451 (2) | 0.20884 (18) | 0.0799 (7) | |
O3 | −0.06477 (17) | 0.5800 (3) | 0.14598 (15) | 0.0902 (8) | |
O4 | −0.00984 (17) | 0.5099 (2) | 0.28658 (14) | 0.0709 (6) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0558 (14) | 0.0487 (14) | 0.0407 (12) | −0.0013 (11) | 0.0050 (10) | 0.0002 (10) |
C2 | 0.092 (2) | 0.0565 (17) | 0.0706 (18) | −0.0087 (16) | 0.0424 (17) | 0.0028 (14) |
C3 | 0.0628 (17) | 0.078 (2) | 0.084 (2) | −0.0169 (16) | 0.0242 (16) | −0.0094 (17) |
C4 | 0.0651 (17) | 0.0516 (16) | 0.0669 (17) | −0.0046 (13) | 0.0075 (13) | −0.0092 (13) |
C5 | 0.0543 (14) | 0.0514 (14) | 0.0384 (11) | −0.0023 (11) | 0.0141 (10) | 0.0002 (10) |
C6 | 0.0558 (14) | 0.0530 (14) | 0.0361 (11) | 0.0010 (11) | 0.0086 (10) | −0.0008 (10) |
C7 | 0.0385 (11) | 0.0360 (11) | 0.0409 (11) | 0.0031 (9) | 0.0088 (9) | −0.0005 (9) |
C8 | 0.0448 (12) | 0.0543 (14) | 0.0470 (12) | 0.0011 (11) | 0.0175 (10) | 0.0064 (11) |
C9 | 0.0432 (13) | 0.0758 (18) | 0.0407 (12) | −0.0032 (12) | 0.0072 (10) | 0.0061 (12) |
C10 | 0.0418 (12) | 0.0613 (16) | 0.0393 (11) | −0.0063 (11) | 0.0004 (9) | 0.0113 (11) |
C11 | 0.0406 (12) | 0.0648 (16) | 0.0580 (14) | −0.0129 (12) | 0.0121 (11) | 0.0088 (12) |
C12 | 0.0416 (14) | 0.093 (2) | 0.0730 (18) | 0.0042 (15) | 0.0090 (13) | 0.0168 (17) |
C13 | 0.0614 (18) | 0.069 (2) | 0.108 (3) | 0.0143 (17) | 0.0027 (17) | 0.0073 (19) |
N1 | 0.0493 (11) | 0.0454 (11) | 0.0393 (9) | 0.0019 (9) | 0.0125 (8) | 0.0025 (8) |
N2 | 0.0386 (10) | 0.0493 (12) | 0.0416 (10) | −0.0025 (9) | 0.0046 (8) | 0.0033 (8) |
N3 | 0.0370 (10) | 0.0562 (12) | 0.0403 (10) | 0.0008 (8) | 0.0091 (8) | 0.0102 (8) |
N4 | 0.0369 (10) | 0.0568 (12) | 0.0465 (10) | −0.0022 (9) | 0.0099 (8) | 0.0112 (9) |
N5 | 0.0423 (11) | 0.0519 (12) | 0.0523 (12) | −0.0010 (9) | 0.0101 (9) | 0.0095 (9) |
O1 | 0.0495 (10) | 0.0493 (10) | 0.0636 (11) | 0.0033 (8) | 0.0104 (8) | −0.0040 (8) |
O2 | 0.0524 (12) | 0.0665 (14) | 0.1163 (19) | −0.0084 (10) | −0.0001 (11) | 0.0061 (12) |
O3 | 0.0461 (11) | 0.154 (2) | 0.0675 (13) | −0.0258 (13) | 0.0006 (10) | 0.0314 (14) |
O4 | 0.0549 (11) | 0.0947 (16) | 0.0677 (12) | −0.0047 (10) | 0.0235 (9) | 0.0345 (11) |
C1—O1 | 1.436 (3) | C7—N4 | 1.362 (3) |
C1—C2 | 1.508 (4) | C8—N1 | 1.433 (3) |
C1—C5 | 1.510 (3) | C8—N3 | 1.485 (3) |
C1—H1 | 0.9800 | C8—H8A | 0.9700 |
C2—C3 | 1.485 (4) | C8—H8B | 0.9700 |
C2—H2A | 0.9700 | C9—N3 | 1.469 (3) |
C2—H2B | 0.9700 | C9—C10 | 1.481 (3) |
C3—C4 | 1.494 (4) | C9—H9A | 0.9700 |
C3—H3A | 0.9700 | C9—H9B | 0.9700 |
C3—H3B | 0.9700 | C10—C11 | 1.329 (3) |
C4—O1 | 1.426 (3) | C10—O2 | 1.348 (3) |
C4—H4A | 0.9700 | C11—C12 | 1.405 (4) |
C4—H4B | 0.9700 | C11—H11 | 0.9300 |
C5—N1 | 1.469 (3) | C12—C13 | 1.309 (4) |
C5—H5A | 0.9700 | C12—H12 | 0.9300 |
C5—H5B | 0.9700 | C13—O2 | 1.382 (4) |
C6—N1 | 1.436 (3) | C13—H13 | 0.9300 |
C6—N2 | 1.467 (3) | N2—H2 | 0.82 (3) |
C6—H6A | 0.9700 | N4—N5 | 1.335 (3) |
C6—H6B | 0.9700 | N5—O4 | 1.229 (3) |
C7—N2 | 1.327 (3) | N5—O3 | 1.233 (3) |
C7—N3 | 1.338 (3) | ||
O1—C1—C2 | 105.2 (2) | N1—C8—N3 | 111.98 (18) |
O1—C1—C5 | 108.15 (18) | N1—C8—H8A | 109.2 |
C2—C1—C5 | 114.1 (2) | N3—C8—H8A | 109.2 |
O1—C1—H1 | 109.7 | N1—C8—H8B | 109.2 |
C2—C1—H1 | 109.7 | N3—C8—H8B | 109.2 |
C5—C1—H1 | 109.7 | H8A—C8—H8B | 107.9 |
C3—C2—C1 | 103.8 (2) | N3—C9—C10 | 112.8 (2) |
C3—C2—H2A | 111.0 | N3—C9—H9A | 109.0 |
C1—C2—H2A | 111.0 | C10—C9—H9A | 109.0 |
C3—C2—H2B | 111.0 | N3—C9—H9B | 109.0 |
C1—C2—H2B | 111.0 | C10—C9—H9B | 109.0 |
H2A—C2—H2B | 109.0 | H9A—C9—H9B | 107.8 |
C2—C3—C4 | 104.2 (2) | C11—C10—O2 | 109.6 (2) |
C2—C3—H3A | 110.9 | C11—C10—C9 | 131.8 (3) |
C4—C3—H3A | 110.9 | O2—C10—C9 | 118.6 (2) |
C2—C3—H3B | 110.9 | C10—C11—C12 | 107.4 (3) |
C4—C3—H3B | 110.9 | C10—C11—H11 | 126.3 |
H3A—C3—H3B | 108.9 | C12—C11—H11 | 126.3 |
O1—C4—C3 | 107.4 (2) | C13—C12—C11 | 106.9 (3) |
O1—C4—H4A | 110.2 | C13—C12—H12 | 126.6 |
C3—C4—H4A | 110.2 | C11—C12—H12 | 126.6 |
O1—C4—H4B | 110.2 | C12—C13—O2 | 109.9 (3) |
C3—C4—H4B | 110.2 | C12—C13—H13 | 125.1 |
H4A—C4—H4B | 108.5 | O2—C13—H13 | 125.1 |
N1—C5—C1 | 111.59 (18) | C8—N1—C6 | 108.15 (19) |
N1—C5—H5A | 109.3 | C8—N1—C5 | 112.63 (19) |
C1—C5—H5A | 109.3 | C6—N1—C5 | 113.40 (19) |
N1—C5—H5B | 109.3 | C7—N2—C6 | 122.69 (19) |
C1—C5—H5B | 109.3 | C7—N2—H2 | 117.9 (18) |
H5A—C5—H5B | 108.0 | C6—N2—H2 | 118.7 (18) |
N1—C6—N2 | 111.20 (18) | C7—N3—C9 | 123.22 (18) |
N1—C6—H6A | 109.4 | C7—N3—C8 | 119.94 (18) |
N2—C6—H6A | 109.4 | C9—N3—C8 | 116.49 (18) |
N1—C6—H6B | 109.4 | N5—N4—C7 | 119.09 (19) |
N2—C6—H6B | 109.4 | O4—N5—O3 | 119.9 (2) |
H6A—C6—H6B | 108.0 | O4—N5—N4 | 116.1 (2) |
N2—C7—N3 | 118.54 (19) | O3—N5—N4 | 123.98 (19) |
N2—C7—N4 | 127.3 (2) | C4—O1—C1 | 109.54 (19) |
N3—C7—N4 | 114.15 (19) | C10—O2—C13 | 106.2 (2) |
O1—C1—C2—C3 | 29.5 (3) | N1—C6—N2—C7 | −25.4 (3) |
C5—C1—C2—C3 | −88.8 (3) | N2—C7—N3—C9 | 175.7 (2) |
C1—C2—C3—C4 | −30.1 (3) | N4—C7—N3—C9 | −4.3 (3) |
C2—C3—C4—O1 | 20.2 (3) | N2—C7—N3—C8 | 2.8 (3) |
O1—C1—C5—N1 | 175.01 (18) | N4—C7—N3—C8 | −177.2 (2) |
C2—C1—C5—N1 | −68.3 (3) | C10—C9—N3—C7 | 130.5 (2) |
N3—C9—C10—C11 | 110.1 (3) | C10—C9—N3—C8 | −56.4 (3) |
N3—C9—C10—O2 | −69.1 (3) | N1—C8—N3—C7 | 28.7 (3) |
O2—C10—C11—C12 | −0.3 (3) | N1—C8—N3—C9 | −144.7 (2) |
C9—C10—C11—C12 | −179.6 (2) | N2—C7—N4—N5 | −0.1 (4) |
C10—C11—C12—C13 | 0.3 (3) | N3—C7—N4—N5 | 179.9 (2) |
C11—C12—C13—O2 | −0.2 (4) | C7—N4—N5—O4 | 178.3 (2) |
N3—C8—N1—C6 | −56.5 (3) | C7—N4—N5—O3 | −3.5 (4) |
N3—C8—N1—C5 | 69.6 (2) | C3—C4—O1—C1 | −1.6 (3) |
N2—C6—N1—C8 | 54.5 (2) | C2—C1—O1—C4 | −17.4 (3) |
N2—C6—N1—C5 | −71.2 (2) | C5—C1—O1—C4 | 104.8 (2) |
C1—C5—N1—C8 | 144.4 (2) | C11—C10—O2—C13 | 0.2 (3) |
C1—C5—N1—C6 | −92.4 (2) | C9—C10—O2—C13 | 179.6 (2) |
N3—C7—N2—C6 | −4.4 (3) | C12—C13—O2—C10 | 0.0 (4) |
N4—C7—N2—C6 | 175.6 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2···O3 | 0.82 (3) | 1.97 (3) | 2.563 (3) | 128 (2) |
N2—H2···O1i | 0.82 (3) | 2.43 (3) | 3.035 (3) | 132 (2) |
Symmetry code: (i) −x, −y+2, −z. |
Experimental details
Crystal data | |
Chemical formula | C13H19N5O4 |
Mr | 309.33 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 298 |
a, b, c (Å) | 11.1898 (12), 9.262 (1), 14.4863 (15) |
β (°) | 99.276 (2) |
V (Å3) | 1481.7 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.11 |
Crystal size (mm) | 0.16 × 0.12 × 0.10 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector diffractometer |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 9196, 2902, 2615 |
Rint | 0.054 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.066, 0.164, 1.18 |
No. of reflections | 2902 |
No. of parameters | 202 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.34, −0.21 |
Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2···O3 | 0.82 (3) | 1.97 (3) | 2.563 (3) | 128 (2) |
N2—H2···O1i | 0.82 (3) | 2.43 (3) | 3.035 (3) | 132 (2) |
Symmetry code: (i) −x, −y+2, −z. |
References
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In recent years, the neonicotinoids have been the fastest-growing class of insecticides used in modern crop protection (Tomizawa et al., 2000; Kagabu et al., 2005; Tian et al., 2007; Peter & Ralf, 2008). We report here crystal structure of one of these compounds, C13H19N5O4, the title compound (I). In the structure of (I) (Fig. 1), the triazine ring exhibits a half-chair conformation with a dihedral angle of 50.62° between plane A (C8, N3, C7, N2, C6) and plane B (C6, N1, C8). The bond angles C8–N1–C6, N1–C6–N2, C6–N2–C7, N2–C7–N3, C7–N3–C8 and N3–C8–N1 are 108.15 (19), 111.20 (18), 122.69 (19), 118.54 (19), 119.94 (18) and 111.98 (18)° respectively, in turn indicating asymmetry and strong tensility in the 1,3,5-hexahydrotriazine ring. The large discrepancy between the nitro O3–N5–N4 and O4–N5–N4 bond angles [116.1 (2) and 123.98 (19)° respectively] may be attributed to the intramolecular N2–H···O3 hydrogen bond (Table 1). There is also a single intermolecular N–H···O hydrogen bond associated with N2 (Fig. 2).
Interestingly, due to the transfer of the lone-pair of electrons from the hetero-N atoms to the C7═N4 double bond, the C7–N2 and C7–N3 bond lengths (1.327 (3) Å and 1.338 (3) Å), are both remarkably shorter than the pure C–N single bond (1.49 Å), but close to the C═C value (1.33 Å). The delocalization of the electrons extends as far as the electron-withdrawing nitro group, forming a coplanar π-electron network. A six-membered plane C (C7, N4, N5, O3, H2 and N2) is established by the intramolecular N2–H···O3 hydrogen bond. In addition, planes A and C form an enlarged plane D (comprising C6, C8, N3, C7, N2, H2, N4, O3 and O4).