The molecule of the title compound is almost planar but with a dihedral angle between the two phenyl rings of 19.22 (5)°. In the crystal, molecules are linked by C—H⋯O interactions, forming sheets in the (21
) plane.
Keywords: crystal structure, nitrobenzene, alkyne, chalcone, phenyl ring
Abstract
The structure of the title compound, C18H13NO4, shows that the whole molecule is almost planar but with a dihedral angle between the two phenyl rings of 19.22 (5)°. The molecules are linked by C—H⋯O interactions, forming sheets in the (21
) plane.
Structure description
Chalcones are among the leading bioactive flavonoids, with a therapeutic potential implicated to an array of bioactivities that have been investigated by a series of preclinical and clinical studies. They contain an α-β unsaturated carbonyl system, which is present in open-chain form, and two aromatic rings are joined through three-carbon atoms (Kozlowski et al., 2007 ▸; Raghav & Garg, 2014 ▸). Studies depicting the biological activities of chalcones and their derivatives describe their immense significance as antidiabetic, anticancer, anti-inflammatory, antimicrobial, antioxidant, antiparasitic, psychoactive and neuroprotective agents, and their antioxidant and enzyme inhibitory activities (Lin et al., 2002 ▸; Bhat et al., 2005 ▸; Trivedi et al., 2007 ▸; Lahtchev et al., 2008 ▸; Aneja et al., 2018 ▸).
Chalcone as a privileged structure in medicinal chemistry has been reviewed by Zhuang et al. (2017 ▸). A comprehensive review of chalcone derivatives as antileishmanial agents has also been published (de Mello et al., 2018 ▸). The crystal structures of (2E)-1-(4-methylphenyl)-3-(4-nitrophenyl)prop-2-en-1-one (Butcher et al., 2007 ▸), (2E)-1-(3-bromophenyl)-3-(4,5-dimethoxy-2-nitrophenyl)prop-2-en-1-one (Jasinski et al., 2010 ▸), (2E)-3-(3-nitrophenyl)-1-[4-(piperidin-1-yl)phenyl]prop-2-en-1-one (Fun et al., 2012 ▸) and 4′-dimethylamino-3-nitrochalcone, 3-dimethylamino-3′-nitrochalcone and 3′-nitrochalcone (Hall et al., 2020 ▸) have been reported.
The present work describes the synthesis and crystal structure of the title compound 3-(3-nitrophenyl)-1-[4-(prop-2-ynyloxy)phenyl]prop-2-en-1-one (Fig. 1 ▸), which crystallizes in the triclinic space group P
with one molecule in the asymmetric unit. It consists both a 3-nitrophenyl group and a (prop-2-yn-1-yloxy)benzene group linked to a central chalcone moiety. Even though the C—N bond length is 1.4706 (17) Å and thus single, the nitro group is almost coplanar with its phenyl ring [dihedral angle of 18.94 (6)°] as a result of the steric clash between O1 and H4 and between O2 and H2, respectively. The chalcone group is planar (average deviation from plane of 0.004 Å) and makes dihedral angles of 7.69 (8) and 10.96 (6)° with the 3-nitrophenyl ring and the phenyl ring of the (prop-2-yn-1-yloxy)benzene group, respectively. Lastly, the twist between the two phenyl rings which are linked by the chalcone is 19.22 (5)°.
Figure 1.
Diagram of molecules showing the atom-labelling scheme. Atomic displacement parameters are at the 30% probability level.
The molecules are linked by C–H⋯O interactions (Table 1 ▸), which form sheets in the (21
) plane as shown in Fig. 2 ▸
. There are no π–π interactions between the phenyl rings.
Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C18—H18A⋯O2i | 0.901 (18) | 2.519 (18) | 3.3927 (18) | 163.6 (15) |
Symmetry code: (i)
.
Figure 2.
Packing diagram for the title compound showing the C–H⋯O interactions linking the molecules into sheets in the (21
) plane.
Synthesis and crystallization
A well-stirred solution of 1-[4-(prop-2-ynyloxy)phenyl]ethanone (1 g, 1 mmol) in 20 ml of ethanol was added slowly to alcoholic potassium hydroxide (0.48 g, 1.5 mmol). To this solution, m-nitro benzaldehyde (1.03 g, 1.2 mmol) was added. The resulting mixture was stirred at room temperature for 30 min. Then, the separated solid from the reaction mixture was filtered, washed with cold water, dried and recrystallized from ethanol:dimethylformamide mixture (9:1). Golden yellow crystals (yield: 86%, m.p. 453–454 K). The reaction scheme is shown in Fig. 3 ▸. FT–IR: νmax, cm−1 (KBr): 2987 (C—H aliphatic), 2117 (C≡C str), 1650 (C=O), 1518 (asym NO2 stretch),1444 (sym NO2 stretch), 1252 (C—O stretch); 1H NMR (400 MHz, CDCl3, δ p.p.m.): 7.55 (d, 1H, J = 15.7 Hz, olefinic-β), 7.36 (d, 2H, J = 8.8 Hz, Ar—H), 7.28 (d, 2H, J = 8.6 Hz, Ar—H), 7.16 (d, 2H, J = 8.8 Hz, Ar—H), 7.09 (d, 2H, J = 8.3 Hz, Ar—H), 6.73 (d, 1H, J = 15.7 Hz, olefinic-α), 4.46 (s, 2H, O—CH2), 2.79 (s, 1H, acetylene proton).
Figure 3.
Reaction scheme for the synthesis of the title compound.
Refinement
Crystal data, data collection and structure refinement details for the title compound are summarized in Table 2 ▸.
Table 2. Experimental details.
| Crystal data | |
| Chemical formula | C18H13NO4 |
| M r | 307.29 |
| Crystal system, space group | Triclinic, P
|
| Temperature (K) | 100 |
| a, b, c (Å) | 7.6534 (16), 8.6079 (15), 11.369 (2) |
| α, β, γ (°) | 94.433 (7), 97.953 (8), 97.019 (7) |
| V (Å3) | 732.8 (3) |
| Z | 2 |
| Radiation type | Mo Kα |
| μ (mm−1) | 0.10 |
| Crystal size (mm) | 0.33 × 0.19 × 0.14 |
| Data collection | |
| Diffractometer | Bruker APEXII CCD |
| Absorption correction | Multi-scan (SADABS; Bruker, 2016 ▸) |
| T min, T max | 0.634, 0.729 |
| No. of measured, independent and observed [I > 2σ(I)] reflections | 47166, 3638, 2700 |
| R int | 0.089 |
| (sin θ/λ)max (Å−1) | 0.667 |
| Refinement | |
| R[F 2 > 2σ(F 2)], wR(F 2), S | 0.046, 0.137, 1.08 |
| No. of reflections | 3638 |
| No. of parameters | 212 |
| H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
| Δρmax, Δρmin (e Å−3) | 0.28, −0.21 |
Supplementary Material
Crystal structure: contains datablock(s) I. DOI: 10.1107/S2414314622009579/bt4126sup1.cif
Structure factors: contains datablock(s) I. DOI: 10.1107/S2414314622009579/bt4126Isup2.hkl
Supporting information file. DOI: 10.1107/S2414314622009579/bt4126Isup3.cml
CCDC reference: 2210152
Additional supporting information: crystallographic information; 3D view; checkCIF report
Acknowledgments
V is grateful to the DST–PURSE Project, Vignan Bhavana, UOM, for providing research facilities.
full crystallographic data
Crystal data
| C18H13NO4 | Z = 2 |
| Mr = 307.29 | F(000) = 320 |
| Triclinic, P1 | Dx = 1.393 Mg m−3 |
| a = 7.6534 (16) Å | Mo Kα radiation, λ = 0.71073 Å |
| b = 8.6079 (15) Å | Cell parameters from 9976 reflections |
| c = 11.369 (2) Å | θ = 2.7–32.9° |
| α = 94.433 (7)° | µ = 0.10 mm−1 |
| β = 97.953 (8)° | T = 100 K |
| γ = 97.019 (7)° | Prism, yellow |
| V = 732.8 (3) Å3 | 0.33 × 0.19 × 0.14 mm |
Data collection
| Bruker APEXII CCD diffractometer | 2700 reflections with I > 2σ(I) |
| φ and ω scans | Rint = 0.089 |
| Absorption correction: multi-scan (SADABS; Bruker, 2016) | θmax = 28.3°, θmin = 2.4° |
| Tmin = 0.634, Tmax = 0.729 | h = −10→10 |
| 47166 measured reflections | k = −11→10 |
| 3638 independent reflections | l = −15→15 |
Refinement
| Refinement on F2 | Primary atom site location: dual |
| Least-squares matrix: full | Secondary atom site location: difference Fourier map |
| R[F2 > 2σ(F2)] = 0.046 | Hydrogen site location: mixed |
| wR(F2) = 0.137 | H atoms treated by a mixture of independent and constrained refinement |
| S = 1.08 | w = 1/[σ2(Fo2) + (0.0642P)2 + 0.1082P] where P = (Fo2 + 2Fc2)/3 |
| 3638 reflections | (Δ/σ)max < 0.001 |
| 212 parameters | Δρmax = 0.28 e Å−3 |
| 0 restraints | Δρmin = −0.21 e Å−3 |
Special details
| 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. The acetylenic H atom was freely refined. All remaining hydrogen atoms were placed geometrically and refined as riding atoms with their Uiso values 1.2 times that of their attached atoms. |
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2)
| x | y | z | Uiso*/Ueq | ||
| O1 | 0.8224 (2) | −0.53179 (13) | 0.40582 (11) | 0.0732 (4) | |
| O2 | 0.78869 (16) | −0.48667 (12) | 0.22192 (10) | 0.0557 (3) | |
| O3 | 0.38666 (16) | 0.19330 (12) | 0.03294 (9) | 0.0557 (3) | |
| O4 | 0.12863 (14) | 0.82184 (10) | 0.22678 (8) | 0.0419 (3) | |
| N1 | 0.79204 (16) | −0.44535 (13) | 0.32710 (11) | 0.0436 (3) | |
| C1 | 0.63484 (18) | −0.05300 (15) | 0.30785 (12) | 0.0358 (3) | |
| C2 | 0.67213 (17) | −0.20372 (14) | 0.27518 (11) | 0.0342 (3) | |
| H2A | 0.639784 | −0.249615 | 0.195197 | 0.041* | |
| C3 | 0.75705 (18) | −0.28509 (15) | 0.36138 (12) | 0.0362 (3) | |
| C4 | 0.8101 (2) | −0.22355 (17) | 0.47820 (12) | 0.0446 (3) | |
| H4A | 0.868961 | −0.282414 | 0.535011 | 0.054* | |
| C5 | 0.7751 (2) | −0.07331 (18) | 0.51018 (13) | 0.0518 (4) | |
| H5A | 0.811026 | −0.027252 | 0.589874 | 0.062* | |
| C6 | 0.6882 (2) | 0.00972 (17) | 0.42650 (13) | 0.0469 (4) | |
| H6A | 0.663892 | 0.112233 | 0.450078 | 0.056* | |
| C7 | 0.54529 (18) | 0.03375 (15) | 0.21647 (12) | 0.0378 (3) | |
| H7A | 0.524932 | −0.013883 | 0.136707 | 0.045* | |
| C8 | 0.49007 (19) | 0.17290 (15) | 0.23512 (12) | 0.0402 (3) | |
| H8A | 0.505167 | 0.222444 | 0.314155 | 0.048* | |
| C9 | 0.40553 (19) | 0.25253 (15) | 0.13558 (12) | 0.0386 (3) | |
| C10 | 0.34071 (18) | 0.40617 (14) | 0.16303 (11) | 0.0345 (3) | |
| C11 | 0.32576 (18) | 0.46816 (15) | 0.27815 (11) | 0.0366 (3) | |
| H11A | 0.365827 | 0.414762 | 0.344742 | 0.044* | |
| C12 | 0.25357 (19) | 0.60589 (15) | 0.29624 (11) | 0.0382 (3) | |
| H12A | 0.242477 | 0.645757 | 0.374749 | 0.046* | |
| C13 | 0.19719 (17) | 0.68610 (14) | 0.19960 (11) | 0.0343 (3) | |
| C14 | 0.2132 (2) | 0.62771 (16) | 0.08447 (12) | 0.0418 (3) | |
| H14A | 0.176033 | 0.682647 | 0.018101 | 0.050* | |
| C15 | 0.2840 (2) | 0.48861 (16) | 0.06802 (12) | 0.0418 (3) | |
| H15A | 0.293985 | 0.448410 | −0.010617 | 0.050* | |
| C16 | 0.0652 (2) | 0.90385 (15) | 0.12751 (12) | 0.0412 (3) | |
| H16A | −0.037244 | 0.838377 | 0.076985 | 0.049* | |
| H16B | 0.160640 | 0.926181 | 0.078194 | 0.049* | |
| C17 | 0.01114 (18) | 1.05106 (15) | 0.17380 (12) | 0.0397 (3) | |
| C18 | −0.0334 (2) | 1.17155 (17) | 0.20482 (14) | 0.0466 (4) | |
| H18A | −0.067 (2) | 1.266 (2) | 0.2248 (15) | 0.057 (5)* |
Atomic displacement parameters (Å2)
| U11 | U22 | U33 | U12 | U13 | U23 | |
| O1 | 0.1189 (11) | 0.0461 (6) | 0.0560 (7) | 0.0324 (7) | −0.0072 (7) | 0.0173 (5) |
| O2 | 0.0791 (8) | 0.0448 (6) | 0.0449 (6) | 0.0280 (5) | 0.0012 (5) | −0.0014 (5) |
| O3 | 0.0887 (9) | 0.0452 (6) | 0.0366 (6) | 0.0323 (6) | 0.0041 (5) | −0.0009 (4) |
| O4 | 0.0605 (6) | 0.0339 (5) | 0.0339 (5) | 0.0210 (4) | 0.0040 (4) | 0.0022 (4) |
| N1 | 0.0506 (7) | 0.0363 (6) | 0.0440 (7) | 0.0146 (5) | −0.0018 (5) | 0.0069 (5) |
| C1 | 0.0395 (7) | 0.0333 (6) | 0.0357 (7) | 0.0103 (5) | 0.0049 (5) | 0.0040 (5) |
| C2 | 0.0384 (7) | 0.0328 (6) | 0.0316 (6) | 0.0087 (5) | 0.0027 (5) | 0.0026 (5) |
| C3 | 0.0397 (7) | 0.0333 (6) | 0.0372 (7) | 0.0102 (5) | 0.0052 (5) | 0.0063 (5) |
| C4 | 0.0535 (8) | 0.0465 (8) | 0.0352 (7) | 0.0153 (6) | 0.0012 (6) | 0.0090 (6) |
| C5 | 0.0691 (10) | 0.0530 (9) | 0.0320 (7) | 0.0183 (7) | −0.0018 (7) | −0.0026 (6) |
| C6 | 0.0633 (9) | 0.0391 (7) | 0.0388 (7) | 0.0179 (7) | 0.0032 (6) | −0.0021 (6) |
| C7 | 0.0457 (7) | 0.0333 (6) | 0.0353 (7) | 0.0121 (5) | 0.0040 (5) | 0.0016 (5) |
| C8 | 0.0514 (8) | 0.0340 (7) | 0.0359 (7) | 0.0148 (6) | 0.0025 (6) | 0.0014 (5) |
| C9 | 0.0484 (8) | 0.0324 (6) | 0.0366 (7) | 0.0130 (5) | 0.0061 (6) | 0.0021 (5) |
| C10 | 0.0406 (7) | 0.0296 (6) | 0.0339 (6) | 0.0096 (5) | 0.0038 (5) | 0.0025 (5) |
| C11 | 0.0472 (7) | 0.0324 (6) | 0.0317 (6) | 0.0115 (5) | 0.0037 (5) | 0.0066 (5) |
| C12 | 0.0514 (8) | 0.0343 (6) | 0.0299 (6) | 0.0109 (6) | 0.0064 (5) | 0.0014 (5) |
| C13 | 0.0396 (7) | 0.0281 (6) | 0.0352 (6) | 0.0090 (5) | 0.0033 (5) | 0.0007 (5) |
| C14 | 0.0596 (9) | 0.0371 (7) | 0.0307 (6) | 0.0188 (6) | 0.0018 (6) | 0.0047 (5) |
| C15 | 0.0603 (9) | 0.0365 (7) | 0.0305 (6) | 0.0177 (6) | 0.0044 (6) | 0.0011 (5) |
| C16 | 0.0526 (8) | 0.0343 (7) | 0.0368 (7) | 0.0160 (6) | −0.0016 (6) | 0.0028 (5) |
| C17 | 0.0429 (7) | 0.0361 (7) | 0.0408 (7) | 0.0107 (6) | 0.0019 (6) | 0.0062 (5) |
| C18 | 0.0518 (9) | 0.0378 (7) | 0.0527 (9) | 0.0170 (6) | 0.0063 (7) | 0.0052 (6) |
Geometric parameters (Å, º)
| O1—N1 | 1.2232 (15) | C8—C9 | 1.4815 (18) |
| O2—N1 | 1.2168 (16) | C8—H8A | 0.9500 |
| O3—C9 | 1.2189 (16) | C9—C10 | 1.4940 (17) |
| O4—C13 | 1.3693 (14) | C10—C15 | 1.3866 (17) |
| O4—C16 | 1.4362 (15) | C10—C11 | 1.3997 (18) |
| N1—C3 | 1.4706 (17) | C11—C12 | 1.3809 (17) |
| C1—C2 | 1.3957 (17) | C11—H11A | 0.9500 |
| C1—C6 | 1.3996 (19) | C12—C13 | 1.3888 (17) |
| C1—C7 | 1.4680 (18) | C12—H12A | 0.9500 |
| C2—C3 | 1.3838 (17) | C13—C14 | 1.3924 (18) |
| C2—H2A | 0.9500 | C14—C15 | 1.3835 (18) |
| C3—C4 | 1.3780 (19) | C14—H14A | 0.9500 |
| C4—C5 | 1.384 (2) | C15—H15A | 0.9500 |
| C4—H4A | 0.9500 | C16—C17 | 1.4627 (18) |
| C5—C6 | 1.380 (2) | C16—H16A | 0.9900 |
| C5—H5A | 0.9500 | C16—H16B | 0.9900 |
| C6—H6A | 0.9500 | C17—C18 | 1.1746 (19) |
| C7—C8 | 1.3295 (17) | C18—H18A | 0.901 (18) |
| C7—H7A | 0.9500 | ||
| C13—O4—C16 | 116.23 (10) | O3—C9—C10 | 120.22 (12) |
| O2—N1—O1 | 122.80 (12) | C8—C9—C10 | 118.90 (11) |
| O2—N1—C3 | 118.79 (11) | C15—C10—C11 | 118.06 (11) |
| O1—N1—C3 | 118.40 (12) | C15—C10—C9 | 117.85 (11) |
| C2—C1—C6 | 118.12 (12) | C11—C10—C9 | 124.01 (11) |
| C2—C1—C7 | 118.90 (11) | C12—C11—C10 | 120.89 (11) |
| C6—C1—C7 | 122.97 (12) | C12—C11—H11A | 119.6 |
| C3—C2—C1 | 118.80 (12) | C10—C11—H11A | 119.6 |
| C3—C2—H2A | 120.6 | C11—C12—C13 | 119.98 (12) |
| C1—C2—H2A | 120.6 | C11—C12—H12A | 120.0 |
| C4—C3—C2 | 123.22 (12) | C13—C12—H12A | 120.0 |
| C4—C3—N1 | 118.22 (11) | O4—C13—C12 | 115.58 (11) |
| C2—C3—N1 | 118.56 (11) | O4—C13—C14 | 124.35 (11) |
| C3—C4—C5 | 117.94 (12) | C12—C13—C14 | 120.07 (11) |
| C3—C4—H4A | 121.0 | C15—C14—C13 | 119.11 (12) |
| C5—C4—H4A | 121.0 | C15—C14—H14A | 120.4 |
| C6—C5—C4 | 120.11 (13) | C13—C14—H14A | 120.4 |
| C6—C5—H5A | 119.9 | C14—C15—C10 | 121.89 (12) |
| C4—C5—H5A | 119.9 | C14—C15—H15A | 119.1 |
| C5—C6—C1 | 121.80 (13) | C10—C15—H15A | 119.1 |
| C5—C6—H6A | 119.1 | O4—C16—C17 | 108.45 (11) |
| C1—C6—H6A | 119.1 | O4—C16—H16A | 110.0 |
| C8—C7—C1 | 125.96 (12) | C17—C16—H16A | 110.0 |
| C8—C7—H7A | 117.0 | O4—C16—H16B | 110.0 |
| C1—C7—H7A | 117.0 | C17—C16—H16B | 110.0 |
| C7—C8—C9 | 121.55 (12) | H16A—C16—H16B | 108.4 |
| C7—C8—H8A | 119.2 | C18—C17—C16 | 176.40 (14) |
| C9—C8—H8A | 119.2 | C17—C18—H18A | 177.0 (11) |
| O3—C9—C8 | 120.87 (12) | ||
| C6—C1—C2—C3 | 1.0 (2) | C7—C8—C9—C10 | 177.91 (13) |
| C7—C1—C2—C3 | 179.80 (12) | O3—C9—C10—C15 | −9.4 (2) |
| C1—C2—C3—C4 | −1.3 (2) | C8—C9—C10—C15 | 171.57 (13) |
| C1—C2—C3—N1 | 178.51 (11) | O3—C9—C10—C11 | 167.42 (14) |
| O2—N1—C3—C4 | −161.56 (14) | C8—C9—C10—C11 | −11.6 (2) |
| O1—N1—C3—C4 | 18.8 (2) | C15—C10—C11—C12 | 1.2 (2) |
| O2—N1—C3—C2 | 18.64 (19) | C9—C10—C11—C12 | −175.62 (13) |
| O1—N1—C3—C2 | −160.96 (13) | C10—C11—C12—C13 | −1.0 (2) |
| C2—C3—C4—C5 | 0.5 (2) | C16—O4—C13—C12 | −178.35 (11) |
| N1—C3—C4—C5 | −179.33 (13) | C16—O4—C13—C14 | 2.0 (2) |
| C3—C4—C5—C6 | 0.6 (2) | C11—C12—C13—O4 | −179.60 (12) |
| C4—C5—C6—C1 | −0.7 (3) | C11—C12—C13—C14 | 0.1 (2) |
| C2—C1—C6—C5 | −0.1 (2) | O4—C13—C14—C15 | −179.70 (13) |
| C7—C1—C6—C5 | −178.78 (15) | C12—C13—C14—C15 | 0.7 (2) |
| C2—C1—C7—C8 | 175.05 (13) | C13—C14—C15—C10 | −0.5 (2) |
| C6—C1—C7—C8 | −6.3 (2) | C11—C10—C15—C14 | −0.4 (2) |
| C1—C7—C8—C9 | 178.18 (13) | C9—C10—C15—C14 | 176.58 (13) |
| C7—C8—C9—O3 | −1.1 (2) | C13—O4—C16—C17 | −175.40 (11) |
Hydrogen-bond geometry (Å, º)
| D—H···A | D—H | H···A | D···A | D—H···A |
| C18—H18A···O2i | 0.901 (18) | 2.519 (18) | 3.3927 (18) | 163.6 (15) |
Symmetry code: (i) x−1, y+2, z.
Funding Statement
HSY and BK are grateful to UGC, New Delhi, for the award of BSR Faculty Fellowship.
References
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Supplementary Materials
Crystal structure: contains datablock(s) I. DOI: 10.1107/S2414314622009579/bt4126sup1.cif
Structure factors: contains datablock(s) I. DOI: 10.1107/S2414314622009579/bt4126Isup2.hkl
Supporting information file. DOI: 10.1107/S2414314622009579/bt4126Isup3.cml
CCDC reference: 2210152
Additional supporting information: crystallographic information; 3D view; checkCIF report



