organic compounds
2-Cyano-N′-[(E)-1-(2-oxo-2H-chromen-3-yl)ethylidene]acetohydrazide
aSchool of Chemical Sciences, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, bPharmaceutical Design and Simulation (PhDS) Laboratory, School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia, and cX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
*Correspondence e-mail: arazaki@usm.my
In the title compound, C14H11N3O3, the chromene ring is almost planar, with a maximum deviation of 0.065 (2) Å from the mean plane for one of the C atoms. In the crystal, inversion dimers linked by pairs of N—H⋯O hydrogen bonds generate R22(8) loops. The dimers are linked by C—H⋯N and C—H⋯O interactions into a three-dimensional network. An aromatic π–π stacking interaction, with a centroid–centroid distance of 3.562 (10) Å, is also observed.
Related literature
For related structures and background to coumarin, see: Yusufzai, Osman, Sulaiman et al. (2012); Yusufzai, Osman, Abdul Rahim et al. (2012).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536812019915/hb6757sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812019915/hb6757Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812019915/hb6757Isup3.cml
To a solution of 3-acetyl-2H-chromen-2-one. (0.188 g, 0.001 mol) in methanol (20 ml), cyanoacetic acid hydrazide (0.98 g m, 0.001 mol) was added with stirring at room temperature. Hydrochloric acid (0.5 ml) was added and the reaction mixture was stirred at 5–10 ° C for 30 min. The solid product thus formed was collected by filtration, dried in vacuum and recrystallized from ethanol-dioxane (2:1) solution to give the title compound as shiny light yellow blocks.
In continuation of our previous work of coumarin derivatives (Yusufzai, Osman, Sulaiman et al., 2012; Yusufzai, Osman, Abdul Rahim et al., 2012) we have synthesized the title compound: its melting point found to be 175–178°C. Synthesis of other derivatives of coumarin cyanoacetohydrazone and their biological activities are under progress.
The chromene ring is almost planar with the maximum deviation of 0.065 (2) Å from atom C1. In the π—π interaction with centroid-centroid distance of 3.562 (10) Å is also observed (Cg1 = O1/C1—C2/C7—C9, Cg2 = C2—C7, 1 - x, -y,1 - z).
N2—H1N2···O3i, C3—H3A···N3ii, C4—H4A···N3iii and C6—H6A···O2 interactions link the molecules into layers parallel to the (1 0 2) plane (Table 1, Fig. 2). These layers are further connected by C13—H13A···O2v and C13—H13B···N3vi intermolecular interactions to form a three-dimensional network (Table 1, Fig. 2). AFor related structures and background to coumarin, see: Yusufzai, Osman, Sulaiman et al. (2012); Yusufzai, Osman, Abdul Rahim et al. (2012).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); 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, 2009).C14H11N3O3 | F(000) = 560 |
Mr = 269.26 | Dx = 1.365 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1883 reflections |
a = 10.4755 (2) Å | θ = 2.9–32.3° |
b = 15.8283 (3) Å | µ = 0.10 mm−1 |
c = 8.2650 (2) Å | T = 100 K |
β = 106.982 (2)° | Block, yellow |
V = 1310.66 (5) Å3 | 0.20 × 0.18 × 0.13 mm |
Z = 4 |
Bruker SMART APEXII CCD diffractometer | 3020 independent reflections |
Radiation source: fine-focus sealed tube | 1987 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.061 |
φ and ω scans | θmax = 27.5°, θmin = 2.0° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −13→11 |
Tmin = 0.980, Tmax = 0.988 | k = −20→20 |
13242 measured reflections | l = −10→10 |
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)] = 0.057 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.120 | All H-atom parameters refined |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0477P)2 + 0.221P] where P = (Fo2 + 2Fc2)/3 |
3020 reflections | (Δ/σ)max < 0.001 |
225 parameters | Δρmax = 0.27 e Å−3 |
0 restraints | Δρmin = −0.26 e Å−3 |
C14H11N3O3 | V = 1310.66 (5) Å3 |
Mr = 269.26 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 10.4755 (2) Å | µ = 0.10 mm−1 |
b = 15.8283 (3) Å | T = 100 K |
c = 8.2650 (2) Å | 0.20 × 0.18 × 0.13 mm |
β = 106.982 (2)° |
Bruker SMART APEXII CCD diffractometer | 3020 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 1987 reflections with I > 2σ(I) |
Tmin = 0.980, Tmax = 0.988 | Rint = 0.061 |
13242 measured reflections |
R[F2 > 2σ(F2)] = 0.057 | 0 restraints |
wR(F2) = 0.120 | All H-atom parameters refined |
S = 1.03 | Δρmax = 0.27 e Å−3 |
3020 reflections | Δρmin = −0.26 e Å−3 |
225 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. |
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 | ||
O1 | 0.63816 (12) | 0.09170 (8) | 0.75003 (16) | 0.0247 (3) | |
O2 | 0.51923 (13) | 0.17039 (9) | 0.87086 (18) | 0.0315 (4) | |
O3 | 0.00031 (13) | −0.10885 (9) | 1.00205 (17) | 0.0299 (4) | |
N1 | 0.26272 (15) | −0.03027 (11) | 0.86808 (19) | 0.0240 (4) | |
N2 | 0.14627 (15) | −0.02929 (11) | 0.9143 (2) | 0.0248 (4) | |
N3 | 0.05268 (18) | −0.31915 (12) | 0.9689 (2) | 0.0381 (5) | |
C1 | 0.52801 (19) | 0.10271 (13) | 0.8072 (2) | 0.0244 (4) | |
C2 | 0.67126 (19) | 0.01490 (12) | 0.6931 (2) | 0.0225 (4) | |
C3 | 0.7888 (2) | 0.01131 (14) | 0.6498 (2) | 0.0266 (5) | |
C4 | 0.8249 (2) | −0.06527 (14) | 0.5953 (2) | 0.0290 (5) | |
C5 | 0.7453 (2) | −0.13655 (14) | 0.5845 (2) | 0.0287 (5) | |
C6 | 0.6272 (2) | −0.13152 (14) | 0.6261 (2) | 0.0271 (5) | |
C7 | 0.58787 (19) | −0.05499 (12) | 0.6825 (2) | 0.0223 (4) | |
C8 | 0.46742 (19) | −0.04304 (13) | 0.7273 (2) | 0.0228 (4) | |
C9 | 0.43492 (18) | 0.03136 (12) | 0.7863 (2) | 0.0225 (4) | |
C10 | 0.31072 (18) | 0.04074 (13) | 0.8374 (2) | 0.0220 (4) | |
C11 | 0.2471 (2) | 0.12496 (14) | 0.8465 (3) | 0.0289 (5) | |
C12 | 0.09542 (19) | −0.10427 (13) | 0.9446 (2) | 0.0241 (4) | |
C13 | 0.1621 (2) | −0.18236 (13) | 0.9000 (3) | 0.0261 (5) | |
C14 | 0.09896 (19) | −0.25873 (14) | 0.9385 (2) | 0.0267 (5) | |
H3A | 0.8460 (19) | 0.0623 (14) | 0.658 (2) | 0.029 (6)* | |
H4A | 0.906 (2) | −0.0682 (13) | 0.564 (2) | 0.031 (6)* | |
H6A | 0.571 (2) | −0.1803 (14) | 0.617 (2) | 0.033 (6)* | |
H5A | 0.7711 (19) | −0.1885 (14) | 0.543 (2) | 0.030 (6)* | |
H8A | 0.4042 (19) | −0.0902 (13) | 0.714 (2) | 0.026 (5)* | |
H11A | 0.153 (2) | 0.1204 (14) | 0.794 (3) | 0.035 (6)* | |
H11B | 0.284 (2) | 0.1687 (15) | 0.787 (3) | 0.045 (7)* | |
H11C | 0.257 (3) | 0.1423 (17) | 0.966 (4) | 0.075 (9)* | |
H13A | 0.255 (2) | −0.1847 (14) | 0.962 (3) | 0.040 (6)* | |
H13B | 0.155 (2) | −0.1803 (14) | 0.777 (3) | 0.043 (6)* | |
H1N2 | 0.102 (2) | 0.0198 (16) | 0.941 (3) | 0.049 (7)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0218 (7) | 0.0214 (8) | 0.0357 (7) | 0.0000 (6) | 0.0159 (6) | −0.0019 (6) |
O2 | 0.0266 (8) | 0.0227 (8) | 0.0483 (8) | 0.0012 (6) | 0.0160 (7) | −0.0072 (7) |
O3 | 0.0265 (8) | 0.0287 (9) | 0.0423 (8) | −0.0002 (6) | 0.0224 (6) | 0.0001 (6) |
N1 | 0.0211 (8) | 0.0269 (10) | 0.0284 (8) | −0.0005 (7) | 0.0137 (7) | 0.0006 (7) |
N2 | 0.0215 (9) | 0.0242 (10) | 0.0340 (9) | 0.0006 (8) | 0.0161 (7) | 0.0002 (7) |
N3 | 0.0403 (11) | 0.0299 (12) | 0.0514 (11) | −0.0052 (9) | 0.0246 (9) | −0.0030 (9) |
C1 | 0.0232 (10) | 0.0214 (11) | 0.0302 (10) | 0.0036 (8) | 0.0104 (8) | 0.0023 (8) |
C2 | 0.0248 (10) | 0.0186 (11) | 0.0258 (9) | 0.0048 (8) | 0.0097 (8) | 0.0000 (8) |
C3 | 0.0241 (10) | 0.0275 (13) | 0.0313 (10) | −0.0003 (9) | 0.0131 (8) | 0.0005 (9) |
C4 | 0.0231 (11) | 0.0334 (13) | 0.0348 (11) | 0.0039 (9) | 0.0153 (9) | −0.0005 (9) |
C5 | 0.0317 (12) | 0.0251 (12) | 0.0331 (11) | 0.0064 (10) | 0.0152 (9) | −0.0009 (9) |
C6 | 0.0319 (11) | 0.0201 (12) | 0.0329 (10) | 0.0008 (9) | 0.0154 (9) | 0.0008 (9) |
C7 | 0.0238 (10) | 0.0199 (11) | 0.0259 (9) | 0.0023 (8) | 0.0113 (8) | 0.0015 (8) |
C8 | 0.0252 (10) | 0.0188 (11) | 0.0278 (10) | −0.0016 (9) | 0.0130 (8) | 0.0019 (8) |
C9 | 0.0220 (10) | 0.0211 (11) | 0.0272 (9) | 0.0002 (8) | 0.0116 (8) | 0.0017 (8) |
C10 | 0.0207 (10) | 0.0241 (12) | 0.0242 (9) | 0.0009 (8) | 0.0113 (8) | −0.0002 (8) |
C11 | 0.0279 (12) | 0.0255 (12) | 0.0398 (12) | 0.0032 (9) | 0.0200 (10) | 0.0034 (9) |
C12 | 0.0226 (10) | 0.0251 (12) | 0.0277 (9) | 0.0006 (9) | 0.0118 (8) | −0.0004 (8) |
C13 | 0.0252 (11) | 0.0229 (12) | 0.0357 (11) | −0.0032 (9) | 0.0175 (9) | −0.0032 (9) |
C14 | 0.0239 (10) | 0.0265 (12) | 0.0331 (10) | −0.0024 (9) | 0.0137 (8) | −0.0049 (9) |
O1—C1 | 1.379 (2) | C5—C6 | 1.380 (3) |
O1—C2 | 1.384 (2) | C5—H5A | 0.96 (2) |
O2—C1 | 1.209 (2) | C6—C7 | 1.402 (3) |
O3—C12 | 1.225 (2) | C6—H6A | 0.96 (2) |
N1—C10 | 1.287 (2) | C7—C8 | 1.428 (3) |
N1—N2 | 1.381 (2) | C8—C9 | 1.356 (3) |
N2—C12 | 1.354 (2) | C8—H8A | 0.98 (2) |
N2—H1N2 | 0.96 (2) | C9—C10 | 1.488 (3) |
N3—C14 | 1.133 (3) | C10—C11 | 1.502 (3) |
C1—C9 | 1.469 (3) | C11—H11A | 0.95 (2) |
C2—C3 | 1.380 (3) | C11—H11B | 0.99 (2) |
C2—C7 | 1.396 (3) | C11—H11C | 1.00 (3) |
C3—C4 | 1.384 (3) | C12—C13 | 1.517 (3) |
C3—H3A | 1.00 (2) | C13—C14 | 1.457 (3) |
C4—C5 | 1.390 (3) | C13—H13A | 0.96 (2) |
C4—H4A | 0.96 (2) | C13—H13B | 1.00 (2) |
C1—O1—C2 | 123.02 (15) | C9—C8—C7 | 122.84 (19) |
C10—N1—N2 | 118.20 (17) | C9—C8—H8A | 117.9 (12) |
C12—N2—N1 | 117.93 (17) | C7—C8—H8A | 119.3 (12) |
C12—N2—H1N2 | 114.9 (14) | C8—C9—C1 | 118.83 (18) |
N1—N2—H1N2 | 126.7 (14) | C8—C9—C10 | 121.40 (18) |
O2—C1—O1 | 116.01 (17) | C1—C9—C10 | 119.72 (17) |
O2—C1—C9 | 126.87 (18) | N1—C10—C9 | 113.17 (17) |
O1—C1—C9 | 117.12 (17) | N1—C10—C11 | 124.11 (18) |
C3—C2—O1 | 117.10 (18) | C9—C10—C11 | 122.70 (18) |
C3—C2—C7 | 122.69 (19) | C10—C11—H11A | 108.8 (13) |
O1—C2—C7 | 120.21 (17) | C10—C11—H11B | 110.5 (13) |
C2—C3—C4 | 118.0 (2) | H11A—C11—H11B | 109.1 (18) |
C2—C3—H3A | 120.9 (12) | C10—C11—H11C | 112.0 (16) |
C4—C3—H3A | 121.1 (12) | H11A—C11—H11C | 105 (2) |
C3—C4—C5 | 121.1 (2) | H11B—C11—H11C | 111 (2) |
C3—C4—H4A | 118.5 (13) | O3—C12—N2 | 122.15 (18) |
C5—C4—H4A | 120.4 (13) | O3—C12—C13 | 122.03 (18) |
C6—C5—C4 | 120.1 (2) | N2—C12—C13 | 115.81 (17) |
C6—C5—H5A | 120.3 (12) | C14—C13—C12 | 110.63 (16) |
C4—C5—H5A | 119.6 (12) | C14—C13—H13A | 107.8 (13) |
C5—C6—C7 | 120.3 (2) | C12—C13—H13A | 111.6 (13) |
C5—C6—H6A | 120.7 (12) | C14—C13—H13B | 110.2 (13) |
C7—C6—H6A | 119.0 (12) | C12—C13—H13B | 108.4 (13) |
C2—C7—C6 | 117.80 (18) | H13A—C13—H13B | 108.2 (18) |
C2—C7—C8 | 117.57 (18) | N3—C14—C13 | 178.3 (2) |
C6—C7—C8 | 124.62 (19) | ||
C10—N1—N2—C12 | 179.26 (16) | C7—C8—C9—C1 | −0.7 (3) |
C2—O1—C1—O2 | 171.92 (16) | C7—C8—C9—C10 | −177.89 (17) |
C2—O1—C1—C9 | −7.4 (2) | O2—C1—C9—C8 | −173.41 (19) |
C1—O1—C2—C3 | −175.90 (16) | O1—C1—C9—C8 | 5.9 (3) |
C1—O1—C2—C7 | 3.7 (2) | O2—C1—C9—C10 | 3.8 (3) |
O1—C2—C3—C4 | 178.95 (16) | O1—C1—C9—C10 | −176.90 (15) |
C7—C2—C3—C4 | −0.6 (3) | N2—N1—C10—C9 | −179.11 (15) |
C2—C3—C4—C5 | −0.1 (3) | N2—N1—C10—C11 | −0.8 (3) |
C3—C4—C5—C6 | 1.0 (3) | C8—C9—C10—N1 | 19.6 (2) |
C4—C5—C6—C7 | −1.2 (3) | C1—C9—C10—N1 | −157.52 (16) |
C3—C2—C7—C6 | 0.4 (3) | C8—C9—C10—C11 | −158.73 (18) |
O1—C2—C7—C6 | −179.18 (16) | C1—C9—C10—C11 | 24.1 (3) |
C3—C2—C7—C8 | −178.66 (17) | N1—N2—C12—O3 | 172.68 (16) |
O1—C2—C7—C8 | 1.8 (3) | N1—N2—C12—C13 | −8.4 (2) |
C5—C6—C7—C2 | 0.5 (3) | O3—C12—C13—C14 | −1.2 (3) |
C5—C6—C7—C8 | 179.50 (18) | N2—C12—C13—C14 | 179.88 (16) |
C2—C7—C8—C9 | −3.2 (3) | C12—C13—C14—N3 | −154 (7) |
C6—C7—C8—C9 | 177.89 (18) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H1N2···O3i | 0.96 (2) | 1.91 (2) | 2.870 (2) | 174 (2) |
C3—H3A···N3ii | 1.00 (2) | 2.53 (2) | 3.446 (3) | 152.9 (12) |
C4—H4A···N3iii | 0.96 (2) | 2.62 (2) | 3.404 (3) | 139.2 (16) |
C6—H6A···O2iv | 0.96 (2) | 2.56 (2) | 3.494 (3) | 164.7 (17) |
C13—H13A···O2v | 0.96 (2) | 2.38 (2) | 3.328 (3) | 171.7 (18) |
C13—H13B···N3vi | 1.00 (2) | 2.46 (2) | 3.409 (3) | 159.3 (18) |
Symmetry codes: (i) −x, −y, −z+2; (ii) −x+1, y+1/2, −z+3/2; (iii) x+1, −y−1/2, z−1/2; (iv) −x+1, y−1/2, −z+3/2; (v) −x+1, −y, −z+2; (vi) x, −y−1/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | C14H11N3O3 |
Mr | 269.26 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 10.4755 (2), 15.8283 (3), 8.2650 (2) |
β (°) | 106.982 (2) |
V (Å3) | 1310.66 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.10 |
Crystal size (mm) | 0.20 × 0.18 × 0.13 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.980, 0.988 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 13242, 3020, 1987 |
Rint | 0.061 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.057, 0.120, 1.03 |
No. of reflections | 3020 |
No. of parameters | 225 |
H-atom treatment | All H-atom parameters refined |
Δρmax, Δρmin (e Å−3) | 0.27, −0.26 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H1N2···O3i | 0.96 (2) | 1.91 (2) | 2.870 (2) | 174 (2) |
C3—H3A···N3ii | 1.00 (2) | 2.53 (2) | 3.446 (3) | 152.9 (12) |
C4—H4A···N3iii | 0.96 (2) | 2.62 (2) | 3.404 (3) | 139.2 (16) |
C6—H6A···O2iv | 0.96 (2) | 2.56 (2) | 3.494 (3) | 164.7 (17) |
C13—H13A···O2v | 0.96 (2) | 2.38 (2) | 3.328 (3) | 171.7 (18) |
C13—H13B···N3vi | 1.00 (2) | 2.46 (2) | 3.409 (3) | 159.3 (18) |
Symmetry codes: (i) −x, −y, −z+2; (ii) −x+1, y+1/2, −z+3/2; (iii) x+1, −y−1/2, z−1/2; (iv) −x+1, y−1/2, −z+3/2; (v) −x+1, −y, −z+2; (vi) x, −y−1/2, z−1/2. |
Acknowledgements
The authors thank the Malaysian Government and Universiti Sains Malaysia (USM) for the Fundamental Research Grant Scheme (FRGS) grant (No. 203/PKIMIA/6711179) and MOSTI Grant (No. 09-05-lfn-meb-004) to conduct this work. SKY thanks USM for providing Graduate Assistance financial support.
References
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In continuation of our previous work of coumarin derivatives (Yusufzai, Osman, Sulaiman et al., 2012; Yusufzai, Osman, Abdul Rahim et al., 2012) we have synthesized the title compound: its melting point found to be 175–178°C. Synthesis of other derivatives of coumarin cyanoacetohydrazone and their biological activities are under progress.
The chromene ring is almost planar with the maximum deviation of 0.065 (2) Å from atom C1. In the crystal structure, N2—H1N2···O3i, C3—H3A···N3ii, C4—H4A···N3iii and C6—H6A···O2 interactions link the molecules into layers parallel to the (1 0 2) plane (Table 1, Fig. 2). These layers are further connected by C13—H13A···O2v and C13—H13B···N3vi intermolecular interactions to form a three-dimensional network (Table 1, Fig. 2). A π—π interaction with centroid-centroid distance of 3.562 (10) Å is also observed (Cg1 = O1/C1—C2/C7—C9, Cg2 = C2—C7, 1 - x, -y,1 - z).