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Article

Synthesis, Crystal Structures, and Molecular Properties of Three Nitro-Substituted Chalcones

by
Alam Yair Hidalgo
1,
Manuel Velasco
1,
Eduardo Sánchez-Lara
2,†,
Abraham Gómez-Rivera
1,
Miguel A. Vilchis-Reyes
1,
Cuauhtémoc Alvarado
1,
Maribel Herrera-Ruiz
3,
Ricardo López-Rodríguez
1,
Nancy Romero-Ceronio
1,* and
Carlos E. Lobato-García
1
1
División Académica de Ciencias Básicas, Universidad Juárez Autónoma de Tabasco, Carretera Cunduacán-Jalpa Km 1, Col. La Esperanza, Cunduacan 86690, Tabasco, Mexico
2
Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, 18 Sur y Av. San Claudio, Col. San Manuel, Puebla 72570, Puebla, Mexico
3
Centro de Investigacion Biomédica del Sur, Instituto Mexicano del Seguro Social, Calle Rep. Argentina #1, Xochitepec 62780, Morelos, Mexico
*
Author to whom correspondence should be addressed.
†
Currently unaffiliated to Benemérita Universidad Autónoma de Puebla.
Crystals 2021, 11(12), 1589; https://doi.org/10.3390/cryst11121589
Submission received: 22 October 2021 / Revised: 30 November 2021 / Accepted: 2 December 2021 / Published: 20 December 2021
(This article belongs to the Section Organic Crystalline Materials)
Browse Figures
Versions Notes

Abstract

:
Three functionalized chalcones containing combinations of nitro functional groups have been synthesized via Claisen-Schmidt condensation between 2-nitroacetophenone and nitrobenzaldehyde, and the crystal structures obtained ((E)-1,3-bis(2-nitrophenyl)prop-2-en-1-one, 1a, (E)-1-(2-nitrophenyl)-3-(3-nitrophenyl)prop-2-en-1-one, 1b and (E)-1-(2-nitrophenyl)-3-(4-nitrophenyl)prop-2-en-1-one, 1c), C15H10N2O5, are reported. Compounds 1a and 1c crystallized in the triclinic centrosymmetric space group P 1 ¯ , whereas compound 1b crystallized in the orthorhombic space group Pbca. The X-ray analysis reveals that structures 1a and 1b exhibits s-trans conformation, whereas structure 1c exists in s-cis conformation, concerning the olefinic double bonds. In addition, the results show that the position of the nitro substituent attached to the aromatic B-ring has a direct effect on the molecular coplanarity of these compounds. The Hirshfeld surface analysis suggests that the non-covalent π-π stacking interactions are the most important contributors for the crystal packing of 1a and 1b. In 1c, the crystal packing is mainly stabilized by weak intermolecular C―H···O interactions due to the planar nature of the molecule.

Graphical Abstract

1. Introduction

Chalcones (systematic name 1,3-diphenyl-2-propen-1-one) are unique structures found in a wide range of natural and synthetic compounds and are considered one of the privileged scaffolds in the field of medicinal chemistry for drug discovery. Naturally occurring chalcones are multisubstituted in the aryl rings by different groups, mainly hydroxyl, methoxy and alkenyl functions, while their synthetic analogs contain one or more aryl substituents such as halogens, alkyl, amine-, nitro-, nitril-, acetamide-, carboxylic groups, heterocyclic, benzene and condensed rings, etc [1,2,3,4]. Among these synthetic derivatives, the nitrochalcones have generated continuous interest among chemists and biochemists, mainly because of their applications in medicinal chemistry as potential antimicrobial, antihyperglycemic, antinociceptive, antitumor tools [5,6,7,8,9,10,11,12,13]. In this sense, in a previous report, we synthesized three nitro-substituted chalcones and evaluated their anti-inflammatory activity. We found that the chalcone with the nitro group at the ortho position develops the strongest anti-inflammatory protective effect, whereas the chalcone with the nitro group at the para position, showed the smallest effect [14]. Another important aspect of some nitro chalcones is that they can be used as intermediates for synthesizing various heterocyclic compounds like indoles, thioaurones, carbazoles, sultams, benzothiophenes, quinolines and indolin-3-ones [15,16,17,18,19,20,21,22,23]. On the other hand, the nitro chalcones also find application as chemosensors for anion sensing [24]. Additionally, the use of nitrochalcones as organogelators has also been reported [25].
Base on the above, it is of our interest to synthesize nitro-substituted chalcones due to their potential properties. Therefore, we herein report the synthesis, X-ray crystal structure studies and Hirshfeld surface analysis of three nitrochalcone derivatives.

2. Materials and Methods

2.1. General

All chemicals were purchased from Sigma Aldrich (Toluca, Mexico). All manipulations were carried out at room temperature with no special solvent and reagent purification. Melting points were determined on a Stuart SMP10 apparatus by the open capilar technique and are uncorrected. 1H NMR and DEPTQ NMR spectra were recorded at 600 MHz and 150 MHz, respectively, in DMSO-d6 using a Bruker AscendTM Spectrometer. Chemical shifts are given in ppm and reported to the residual solvent peak (DMSO-d6: 2.50 ppm for 1H and 39.51 ppm for 13C). Data are reported as follows: chemical shift (δ), multiplicity (s = singlet, d = doublet, t = triplet, m = multiplet), coupling constant(s) (J, Hz) and integration. Analytical TLC was performed on silica gel 60 F254 plates. IR spectra were obtained using an FT-IR spectrometer, Spectrum One, Perkin Elmer.

2.2. X-ray Crystallography

Single crystals of 1a–1c, suitable for X-ray study, were purified by a two-solvent recrystallization technique at room temperature. Data collection was performed using the Stoe Stadivari diffractometer equipped with an Axo microfocus source Ag-Kα ( λ = 0.56083 Å) and a Dectris Pilatus-100K detector. The absorption correction for the three compounds was realized using measurements of symmetry-related intensities (X-AREA [26]). Structure solutions were obtained using direct methods implemented in SHELXS [27], and the final refinement was performed with full-matrix least-squares on F2 using SHELXL [27]. In the case of 1c, a positional disorder was resolved for the carbonyl atom O7, which was split over two positions, O7a and O7b, with refined occupancies 0.41(4) and 0.59(4). The programs ORTEP-3 [28] SHELXS/SHELXL [27] were used within the WinGX [28] software package. All hydrogen atoms were placed in calculated positions and refined as riding on their parent C atoms, with C―H = 0.95 Å (1a) or C―H = 0.93 Å (1b–c). All H atoms were refined isotropically, with Uiso(H) = 1.2Ueq(carrier C). Geometric parameters of 1a–1c were validated and studied through the Mercury [29] and Platon [30] software. Crystal data, data collection and structure refinement details are summarized in Table 1. Crystallographic information files for the three chalcone derivatives were deposited in the Cambridge Structural Database [31] under codes 2036696, 2036697 and 2036695, respectively. Copies of data can be obtained free of charge at https://www.ccdc.cam.ac.uk/ (accessed on 29 October 2021).

2.3. General Procedure: Synthesis of Nitro Chalcones Derivatives (1a–1c)

To a stirred solution of 2-nitroacetophenone (10 mmol) in ethanol (10 mL) was added a solution of sodium hydroxide (6 mL, 1.0 M) in an ice-salt bath. After stirring for 15 min, the appropriate nitrobenzaldehyde was added and the reaction mixture was stirred for 3 h at room temperature. The progress of the reaction was monitored by TLC. The product obtained was filtered, washed with water and recrystallized by a solvent pair (dichloromethane/n-hexane), which gave the desired nitro chalcone 1.
(E)-1,3-bis(2-nitrophenyl)prop-2-en-1-one 1a. Obtained in 42% yield as a white solid; mp: 140–142 °C [lit. 136–137 °C] [32]; 1H NMR (600 MHz, DMSO-d6) δ = 8.25 (d, J = 8.1 Hz, 1H), 8.08 (d, J = 8.1 Hz, 1H), 8.01 (d, J = 7.7 Hz, 1H), 7.95 (t, J = 7.3 Hz, 1H), 7.85–7.80 (m, 2H), 7.75 (d, J = 7.4 Hz, 1H), 7.70 (t, J = 7.9 Hz, 1H), 7.66 (d, J = 16.1 Hz, 1H), 7.24 (d, J = 16.1 Hz, 1H); DEPTQ NMR (150 MHz, DMSO-d6) δ = 192.6, 148.8, 146.9, 141.6, 135.3, 135.1, 134.4, 132.2, 131.8, 130.0, 129.8, 129.7, 129.6, 125.3, 125.1. FTIR: νmax/cm−1: 1658 (C=O), 1516 (C=C), 1333 (N―O), 977 (C=C trans).
(E)-1-(2-nitrophenyl)-3-(3-nitrophenyl)prop-2-en-1-one 1b. Obtained in 90% yield as a white solid; mp: 145–147 °C [lit. 143–145 °C] [32]; 1H NMR (600 MHz, DMSO-d6) δ = 8.58 (s, 1H), 8.25–8.22 (m, 3H), 7.92 (t, J = 7.4 Hz, 1H), 7.83 (t, J = 7.7 Hz, 1H), 7.74 (d, J = 7.4 Hz, 1H), 7.70 (t, J = 7.9 Hz, 1H), 7.57 (d, J = 16.3 Hz, 1H), 7.51 (d, J = 16.3 Hz, 1H); DEPTQ NMR (150 MHz, DMSO-d6) δ = 192.6, 148.7, 147.0, 143.6, 136.3, 135.6, 135.0, 134.9, 132.0, 130.8, 129.5, 128.6, 125.4, 125.0, 123.9. FTIR: νmax/cm−1: 1650 (C=O), 1523 (C=C), 1345 (N―O), 983 (C=C trans).
(E)-1-(2-nitrophenyl)-3-(4-nitrophenyl)prop-2-en-1-one 1c. Obtained in 81% yield as a yellow solid; mp: 175–177 °C [lit. 168–169 °C] [32]; 1H NMR (600 MHz, DMSO-d6) δ = 8.24–8.22 (m, 3H), 8.01 (m. 2H), 7.93 (t, J = 7.4 Hz, 1H), 7.83 (t, J = 7.7 Hz, 1H), 7.76 (d, J = 7.4 Hz, 1H), 7.53 (d, J = 16.2 Hz, 1H), 7.48 (d, J = 16.2 Hz, 1H); DEPTQ NMR (150 MHz, DMSO-d6) δ = 192.5, 148.7, 147.0, 143.1, 140.8, 135.4, 135.0, 132.1, 130.3, 129.7, 129.5, 125.1, 124.3. FTIR: νmax/cm−1: 1667 (C=O), 1511 (C=C), 1334 (N―O), 983 (C=C trans).

3. Results and Discussion

3.1. Chemistry

The synthetic route of the proposed compound 1a–1c is shown in Scheme 1. The nitro chalcone derivatives were obtained by the reaction of 2-nitroacetophenone with the appropriate nitrobenzaldehyde in the presence of an alcoholic basic medium [14]. All the compounds were recrystallized using a solvent pair. The yield of the compounds after recrystallization ranged from 42 to 90%. In 1H NMR spectra, the values of the coupling constants between Hα and Hβ (J = 16.1–16.3 Hz) confirm that, for this reaction, the products generated were only E-isomers. The 1H (600 MHz) and DEPTQ (150 MHz) NMR. Spectra are presented in Supplementary Materials (Figures S1–S6). The infrared spectra of the synthesized compounds 1a–1c exhibited similar spectral patterns (Figure S7). The IR peaks observed are consistent with the functional groups present in the compound and hence, support the structure of 1a–1c. Table S1 shows the assignments of the main bands [33].
It is important to mention that the behavior observed in the melting points values for the isomers reported as 1a–c can be described as follows: the isomers 1a and 1b present very similar melting points, but in the case of isomer 1c, this physical constant is higher. We can attribute this difference in the melting points values to the fact that the latter isomer presents the flattest conformation, which allows a better packing in the crystalline lattice, thereby increasing the melting point.

3.2. Structural Description

Compound 1a crystallized triclinic with the space group P 1 ¯ (Table 1). The asymmetric unit contains two nitro-substituted aromatic rings in the ortho position, joined by a three-carbon α,β-unsaturated carbonyl system (Figure 1). The molecule adopts the most stable s-trans conformation with respect to the C8 = C9 [1.336(14) Å] and C7 = O7 [1.217(12) Å] functional groups, located in the enone moiety [34]. The structure is twisted around the C1′—C7 and C9—C1 single bonds with torsion angles of 79.82(13)° and 142.81(11)° for C8―C7―C1′―C2′ and C2―C1―C9―C8, respectively. The molecule adopts a conformation in which the ―NO2 groups are closer to each other, generating a slightly more compact asymmetric unit compared to compounds 1b and 1c, which have a more extended molecular backbone (see below). Therefore, this structure can be considered thermodynamically less stable compared with compounds 1b and 1c.
A quick analysis in Mogul geometry check [29] confirms the deviation of the torsion angles, C8―C7―C1′―C2′ [79.82(13)°] and O7―C7―C1′―C6′ [72.54(13)°], from the typical values found in chalcone derivatives. Out of 48 crystal structures analyzed from the Mogul library of the CSD [35], only three crystal structures (CSD refcodes: CNCHAL, BRNICH and NIPFUP) with at least one nitro-substituted aromatic ring have torsion angles similar to those of compound 1a [36,37]. From these data, we can deduce that nitro groups have a direct effect on the degree of torsion of the molecule. This is more evident in this compound due to the electro-withdrawing groups that are in the ortho position in both aromatic systems [38]. As we shall see, as long as the aromatic B-ring changes its substitution pattern, the molecules assume a greater planar character. On the other hand, the two aromatic systems related by the enone group form a dihedral angle of 63.21(4)°. Finally, the nitro groups slightly deviate from the main planes of the aromatic rings with torsion angles of 13.35(14)° and −9.86(15)° for O2―N1―C2′―C1′ and O3―N2―C2―C1, respectively.
Compound 1b crystallizes orthorhombic with space group P b c a (Table 1). Unlike compound 1a, the aromatic rings are nitro-substituted in ortho and meta-positions, which are connected through the ―C = C―C = O planar system (Figure 2). Both NO2-substituents are coplanar with the aromatic rings [O2―N1―C2′―C1′ = −1.3(2)° and O3―N2—C3―C2 = −9.0(2)°]. The change in the substitution pattern (from ortho-to-meta) in the aromatic B-ring causes the molecule to adopt a planar moiety, and both the central enone group and the C1―C6 aromatic-ring are nearly coplanar, with a torsion angle C8―C9―C1―C2 of −163.35(15)°. In contrast, the aromatic A-ring makes a torsion angle C6′―C1′―C7―C8 with the ―C = C―C = O central group of 90.33(19)°. The distancing of the aromatic rings makes the nitro groups tend to be far apart from each other, minimizing the repulsive van der Waals forces. The torsion angles formed between the enone unit and the aromatic rings are also outside typical values; however, this is expected, considering the effect of the NO2-substituent on the geometric parameters of the molecule. Compound 1b exists in the stereoselective s-trans conformation with respect to the C8 = C9 [1.324(2) Å] and C7 = O7 [1.217(18) Å] double bonds. Apparently, this conformation is the predominant form in crystallized chalcone derivatives molecules with low planarity [39,40,41,42].
Compound 1c crystallized triclinic with space group P 1 ¯ (Table 1). The geometry of the molecule is imposed by the change of position of the nitro substituent bonded to the C4, which is in para position to the α , β -unsaturated carbonyl system (Figure 3). The aromatic A-ring retains the ortho substitution pattern in a similar way to compounds 1a and 1b. The torsion angles between the atoms C8―C9―C1―C6 and C8―C7―C1′―C2′ are 177.6(2)° and 165.62(15)°, respectively, indicating that the substituted aromatic systems and the central enone unit are coplanar. Therefore, the molecule adopts the s-cis conformation with respect to the C8 = C9 [1.321(2) Å] and C7 = O7B [1.214(7) Å] double bonds, with a torsion angle C1′―C7―C8―C9 of −178.78(17)°. In contrast to compounds 1a and 1b, the planarity of compound 1c favors the s-cis conformation, which is present in crystallized chalcone derivatives with a planar backbone [43,44,45].
On the other hand, the dihedral angle formed between the main planes from the aromatic rings is 11.38(18)°, which is comparatively smaller than those found in 1a and 1b. In the molecule, the nitro substituent attached to C4 is coplanar with the aromatic system, with a small torsion angle O4―N2―C4―C5 of 3.5(3)°, while the nitro group attached to C2′ rotates out of the aromatic plane with a torsion angle of 69.1(2)° in order to minimize electrostatic repulsions with the C7 = O7B carbonyl functional group.

3.3. Supramolecular Features

Through the molecular packing diagram of compound 1a, we can observe that both aromatic rings are involved in attractive stacking interactions with neighboring molecules placed around inversion centers from the crystallographic space group. These noncovalent interactions seem to dominate the supramolecular structure of this compound due to the lack of conventional hydrogen bonds. In this sense, the C1′―C6′ aromatic rings are stacked in a parallel-displaced fashion along the [1] direction, and the separation between the centroids of this π -systems is 3.647(2) Å, while the C1―C6 aromatic rings are stacked in the same conformation with a centroid-to-centroid distance of 3.729(2) Å (Figure 4). In this scheme, the C1′―C6′ aromatic ring seems to establish two shorth C―H···O contacts with the carbonyl and nitro-group as acceptors, with intermolecular distances of 2.680(7) Å and 2.579(8) Å for C5′―H5′···O7 and C4′―H4’···O2, respectively, but with angles (D―H···A) less than 154°.
It must be considered that the main supramolecular feature of 1a is the π -stacking between the chalcone molecules; we have calculated the Hirshfeld surface with CrystalExplorer 17.5 [46], but instead of using the dnorm function (commonly used to characterize N―H···O or O―H···O hydrogen-bonds), we use the shape index property to identify planar stacking arrangements [47,48,49]. In a shape index function mapped on a Hirshfeld surface, the red hollows indicate noncovalent forces such as weak hydrogen bonds or aromatic interactions, while the blue bumps indicate spaces between neighboring molecules with little or no interaction [48].
In compound 1a the red hollows are located on electronegative regions, which are involved in short contacts via C―H···O hydrogen bonds. In other words, the C6′ from aromatic ring (outside the surface) establishes a weak aromatic hydrogen-bond with O7 atom from carbonyl group as an acceptor with distance C6′―H6′···O7 of 2.60(7) Å (inside the surface). This weak interaction is represented in the shape index as a small red depression (Figure 4). On the other hand, the pattern of blue and red triangles over both aromatic systems is strong evidence for close C···C interplanar contacts, while the green and yellow regions surrounding the aromatic rings are caused by the symmetrical effect of the nitro-groups (Figure 4, inset). The C···C stacking interactions represent 6.2% of the all interactions contained in the crystal according to the 2D-fingerprint plot (Figure S11) [50,51].
In the crystal of compound 1b, the molecules also are held together via short C―H···O contacts, where the O atoms from carbonyl and nitro groups serve as acceptor groups. In a similar way to compound 1a, the π-stacking interactions seem to dominate the crystal packing. The molecules are packing in dimers, favoring the interaction between the planar moieties. In this way, the C1―C6 aromatic rings are stacked in a parallel-displaced fashion with a distance of 3.862(13) Å between the centroids of two inversion-related aromatic rings (Figure 5). The blue and red triangular region on the C1―C6 aromatic ring in the shape index surface confirms the C···C stacking interactions between these systems (Figure 5, inset). The supramolecular assembly is additionally supported by weak C―H···π interactions, implicating the phenyl rings. According to the shape index property, these contacts are observed as a large red depression caused by the proximity of the C1′―C6′ aromatic ring to the C1―C6 system.
Due to the planar geometry of compound 1c, the crystal structure is characterized by a sheet-like alignment of molecules running parallel to the [101] direction. Each layer is formed by inversion-related molecules interacting through C―H···O short contacts, forming R 2 2 ( 16 ) and R 4 4 ( 20 ) graph-set motifs according to Etter´s nomenclature (Figure 6) [52,53]. These infinite layers are stacked on each other, showing additional intermolecular π - π stacking interactions between the C1′―C6′ aromatic rings with a centroid-to-centroid distance of 3.80(4) Å, stabilizing the crystal packing in direction of the crystallographic a-axis. The Hirshfeld surface mapped over dnorm shows red spots where the contacts are shorter than vdW separations [48,49,50,51,52,53,54]. Regarding compound 1c, these spots are related to regions occupied by the nitro and carbonyl groups, which are involved in weak C―H···O hydrogen bonds with neighboring molecules (see inset, Figure 6). These noncovalent interactions represent ca. 50% of all interactions in the crystal, considering reciprocal contacts, according to the 2D fingerprint plot (Figure S12).

4. Conclusions

In summary, we have successfully prepared chalcones containing the ―NO2 group. Crystal structures show that 1a and 1b exhibit s-trans conformation, while 1c isomer crystallized in the s-cis conformation. Varying the position of the nitro group on the aromatic B-ring produces a direct effect on the molecular coplanarity and consequently, on the crystal packing. The chalcone 1c with the nitro group at the para position showed better molecular coplanarity between aromatic rings and the enone moiety. Intermolecular close contacts in the crystal structures of 1a–1c by Hirshfeld surface analysis were visualized and quantified. Intermolecular π -stacking (in 1a–1b) and C―H···O (in 1c) interactions are the most important contributors to the crystal packing.

Supplementary Materials

The following are available online at https://www.mdpi.com/article/10.3390/cryst11121589/s1, Figure S1: 1H NMR (600 MHz, DMSO-d6) of compound 1a, Figure S2: DEPTQ NMR (150 MHz, DMSO-d6) of compound 1a, Figure S3: 1H NMR (600 MHz, DMSO-d6) of compound 1b, Figure S4: DEPTQ NMR (150 MHz, DMSO-d6) of compound 1b, Figure S5: 1H NMR (600 MHz, DMSO-d6) of compound 1c, Figure S6: DEPTQ NMR (150 MHz, DMSO-d6) of compound 1c, Figure S7: FT-IR Spectrum of 1a–1c, Figure S8: A view of the crystal packing down the b axis for compound 1a, Figure S9: A view of the crystal packing down the b axis for compound 1b, Figure S10: A view of the crystal packing down a axis for compound 1c, Figure S11: The two-dimensional fingerprint plot of 1a, Figure S12: The two-dimensional fingerprint plot of 1c, Table S1: Assignment of characteristic vibrational frequencies for 1a–1c, Table S2: Selected Bond lengths [Å] and angles [°] for 1a, Table S3: Selected Bond lengths [Å] and angles [°] for 1b, Table S4: Selected Bond lengths [Å] and angles [°] for 1c, Table S5: Hydrogen-bond for 1a, Table S6: Hydrogen-bond for 1b, Table S7: Hydrogen -bonds for 1c.

Author Contributions

Conceptualization and methodology: N.R.-C., M.A.V.-R. and A.Y.H.; Software and validation: E.S.-L. and C.A.; Formal analysis, investigation, resources: A.Y.H., A.G.-R., R.L.-R. and M.H.-R. Data curation writing-original: A.Y.H., E.S.-L. and M.V. Draft preparation, and writing-review and editing: C.E.L.-G., N.R.-C., A.G.-R. and R.L.-R., Visualization: M.V. and C.A.; Supervision, project administration and funding acquisition: A.G.-R., C.E.L.-G., M.A.V.-R., C.A. and N.R.-C. All authors have read and agreed to the published version of the manuscript.

Funding

The authors are grateful to PRODEP and CONACyT by financial support provided for this research by the projects: UJAT-EXB-242, CONACyT-226155 and CONACyT-268178.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

All data have been included in Supplementary Materials.

Acknowledgments

A.Y.H. wish to thank CONACyT (Mexico) for the fellowship support number 861538. M.V. was supported by PRODEP postdoctoral fellowship (14812). R.L.-R. (478597) was supported by CONACyT postdoctoral fellowship (866998). The authors acknowledge Sylvain Bernès for carrying out the X-ray diffraction experiment performed on a Stoe Stadivari diffractometer, and for the refinement process of the reported crystal structures.

Conflicts of Interest

The authors declare no conflict of interest.

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Crystals 11 01589 sch001 550
Scheme 1. The synthesis of compounds.
Scheme 1. The synthesis of compounds.
Crystals 11 01589 sch001
Crystals 11 01589 g001 550
Figure 1. The molecular structure of compound 1a, with displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small spheres of arbitrary radius.
Figure 1. The molecular structure of compound 1a, with displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small spheres of arbitrary radius.
Crystals 11 01589 g001
Crystals 11 01589 g002 550
Figure 2. The molecular structure of compound 1b, with displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small spheres of arbitrary radius.
Figure 2. The molecular structure of compound 1b, with displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small spheres of arbitrary radius.
Crystals 11 01589 g002
Crystals 11 01589 g003 550
Figure 3. The molecular structure of compound 1c, with displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small spheres of arbitrary radius.
Figure 3. The molecular structure of compound 1c, with displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small spheres of arbitrary radius.
Crystals 11 01589 g003
Crystals 11 01589 g004 550
Figure 4. Part of the crystal structure of 1a, showing the main intermolecular interactions. The inset shows the Hirshfeld surface mapped with the shape index property (−1.0 to 1.0 a.u) highlighting blue regions around bright-red spots within compound 1a. The aromatic-rings involved in stacking interactions are highlighting by dashed blue circles.
Figure 4. Part of the crystal structure of 1a, showing the main intermolecular interactions. The inset shows the Hirshfeld surface mapped with the shape index property (−1.0 to 1.0 a.u) highlighting blue regions around bright-red spots within compound 1a. The aromatic-rings involved in stacking interactions are highlighting by dashed blue circles.
Crystals 11 01589 g004
Crystals 11 01589 g005 550
Figure 5. Part of the crystal structure of 1b, showing intermolecular interactions between the molecules. The inset shows the Hirshfeld surface mapped with the shape index property (−1.0 to 1.0 a.u), highlighting blue regions around bright-red spots within compound 1b. The aromatic-rings involved in aromatic interactions are highlighting by dashed blue circles.
Figure 5. Part of the crystal structure of 1b, showing intermolecular interactions between the molecules. The inset shows the Hirshfeld surface mapped with the shape index property (−1.0 to 1.0 a.u), highlighting blue regions around bright-red spots within compound 1b. The aromatic-rings involved in aromatic interactions are highlighting by dashed blue circles.
Crystals 11 01589 g005
Crystals 11 01589 g006 550
Figure 6. View of the 2D layer structure of 1c in the ab plane. The inset displays the Hirshfeld surface mapped on dnorm property (−0.22 to 1.27 Å), where the orange dashed lines show the contacts of C―H···O with a neighboring chalcone molecule.
Figure 6. View of the 2D layer structure of 1c in the ab plane. The inset displays the Hirshfeld surface mapped on dnorm property (−0.22 to 1.27 Å), where the orange dashed lines show the contacts of C―H···O with a neighboring chalcone molecule.
Crystals 11 01589 g006
Table
Table 1. Single crystal data and structure refinement details for compounds 1a, 1b and 1c.
Table 1. Single crystal data and structure refinement details for compounds 1a, 1b and 1c.
1a1b1c
Empirical formulaC15H10N2O5C15H10N2O5C15H10N2O5
Formula weight298.25298.25298.25
Crystal systemTriclinicOrthorhombicTriclinic
T (K)123(1)295(1)295(1)
Space groupP 1 ¯ PbcaP 1 ¯
CCDC-Numbers 203669620366972036695
Conformations-transs-transs-cis
a [Å]7.6303(4)11.1553(4)7.6817(9)
b [Å]7.8424(5)14.1772(5)7.8867(7)
c [Å]12.5262(8)17.6747(8)12.4081(13)
α (deg)94.327(5)9084.587(8)
β (deg)90.696(5)9074.210(9)
γ (deg)117.716(4)9069.877(8)
V (Å3)660.72(7)2795.27(19)679.20(13)
Z282
Radiation type0.56083 Å0.560830.56083
θ range2.430 to 23.000°2.320 to 21.498°2.553 to 21.497°
Dcalc. (g/cm3)1.499 1.4171.458
μ (mm−1) 0.0700.0670.068
Transm. factors0.572–1.0000.428–1.0000.429–1.000
Reflections collected161326149914368
Independent reflections374332703166
Parameters199200209
Rint0.02410.05270.0429
Goodness-of-fit on F21.0861.0120.892
Final R index [I > 2σ(I)]0.03540.03860.0424
wR2 (all data)0.10020.11190.1199
Largest diff. peak and hole (e/Å3)0.341, −0.2350.166, −0.1740.230, −0.187
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Hidalgo, A.Y.; Velasco, M.; Sánchez-Lara, E.; Gómez-Rivera, A.; Vilchis-Reyes, M.A.; Alvarado, C.; Herrera-Ruiz, M.; López-Rodríguez, R.; Romero-Ceronio, N.; Lobato-García, C.E. Synthesis, Crystal Structures, and Molecular Properties of Three Nitro-Substituted Chalcones. Crystals 2021, 11, 1589. https://doi.org/10.3390/cryst11121589

AMA Style

Hidalgo AY, Velasco M, Sánchez-Lara E, Gómez-Rivera A, Vilchis-Reyes MA, Alvarado C, Herrera-Ruiz M, López-Rodríguez R, Romero-Ceronio N, Lobato-García CE. Synthesis, Crystal Structures, and Molecular Properties of Three Nitro-Substituted Chalcones. Crystals. 2021; 11(12):1589. https://doi.org/10.3390/cryst11121589

Chicago/Turabian Style

Hidalgo, Alam Yair, Manuel Velasco, Eduardo Sánchez-Lara, Abraham Gómez-Rivera, Miguel A. Vilchis-Reyes, Cuauhtémoc Alvarado, Maribel Herrera-Ruiz, Ricardo López-Rodríguez, Nancy Romero-Ceronio, and Carlos E. Lobato-García. 2021. "Synthesis, Crystal Structures, and Molecular Properties of Three Nitro-Substituted Chalcones" Crystals 11, no. 12: 1589. https://doi.org/10.3390/cryst11121589

APA Style

Hidalgo, A. Y., Velasco, M., Sánchez-Lara, E., Gómez-Rivera, A., Vilchis-Reyes, M. A., Alvarado, C., Herrera-Ruiz, M., López-Rodríguez, R., Romero-Ceronio, N., & Lobato-García, C. E. (2021). Synthesis, Crystal Structures, and Molecular Properties of Three Nitro-Substituted Chalcones. Crystals, 11(12), 1589. https://doi.org/10.3390/cryst11121589

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