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Article

Crystal Structure and Supramolecular Architecture of Antiallergic Diphenylene Diethyl Dioxalamates

by
Juan Saulo González-González
1,*,
Nancy Evelyn Magaña-Vergara
2,
Efrén Venancio García-Báez
3,
Itzia Irene Padilla-Martínez
3,
Juan Pablo Mojica-Sánchez
4 and
Francisco Javier Martínez-Martínez
2,*
1
Instituto de Farmacobiología, Universidad de la Cañada, Carretera Teotitlán-San Antonio Nanahuatipan km 1.7 s/n., Teotitlán de Flores Magón, Oaxaca 68540, Mexico
2
Facultad de Ciencias Químicas, Universidad de Colima, km 9 Carretera Colima-Coquimatlán, Coquimatlán, Colima 28400, Mexico
3
Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional-UPIBI, Av. Acueducto s/n Barrio la Laguna Ticomán, Ciudad de México 07340, Mexico
4
Tecnológico Nacional de México, Instituto Tecnológico José Mario Molina Pasquel y Henríquez Campus Tamazula de Gordiano, Carretera Tamazula-Santa Rosa No. 329, Tamazula de Gordiano, Jalisco 49650, Mexico
*
Authors to whom correspondence should be addressed.
Crystals 2020, 10(11), 1048; https://doi.org/10.3390/cryst10111048
Submission received: 23 October 2020 / Revised: 13 November 2020 / Accepted: 16 November 2020 / Published: 18 November 2020
(This article belongs to the Special Issue Hydrogen Bonds in Crystals)
Browse Figures
Versions Notes

Abstract

:
The crystal structure and the supramolecular architectures of the antiallergic compounds N,N′-(4,4′-methanediyl-di-phenyl)-bis-diethyl dioxalamate (1); N′,N′-(4,4′-oxydi-p-phenylene)-bis-diethyl dioxalamate (2); N,N′-(4,4′-biphenylene)-bis- diethyl dioxalamate (3) are reported. The supramolecular self-assembly in 1-3 is driven by N-H···O=C hydrogen bonds and reinforced by C-H···O=C, C-H···π and C=O···C=O interactions. The three compounds preferred to form cross-linked supramolecular architectures. Intermolecular interactions also were studied by the Hirshfeld surface analysis, revealing that the H···H, O···H, and C···H are the more dominant contacts in the three compounds. The knowledge of crystal structure will allow us to perform theoretical studies to evaluate the antiallergic activity of compounds 1-3.

Graphical Abstract

1. Introduction

Allergic conjunctivitis is a disease characterized by the ocular conjunctiva inflammation. It is associated with the degranulation of sensitized mast cells, and is caused by dust, smoke, pollens, chemical vapors, solvents, and environmental antigens. Some symptoms of ocular allergy are itching, tearing, lid and conjunctival edema-redness, and photophobia during the acute phase [1,2].
Therapeutic options for treatment of allergic conjunctivitis are topical steroids, antihistamines, and mast cell stabilizers. Lodoxamide is a phenylene bis-oxalamidic compound that acts as mast cell stabilizer by stopping the Ca2+ flux during the activation of mast cells, inhibiting their degranulation [3].
Phenylene bis-oxalamidic compounds (phenylene bis-dioxalamates and phenylene bis-dioxalamides) have functional groups (N-H, C=O and aromatics) capable of forming hydrogen bond interactions, which make them interesting for the study of supramolecular self-assembly. Our research group has focused on the molecular and supramolecular studies of phenylene bis-ethyl dioxalamates, phenylene bis-oxalamides, and phenylene bis-thiooxalamides, involving studies such as: three-centered hydrogen bonding, solid state polymorphism, effect of steric restraints, host–guest complexes, and supramolecular self-assembly [4,5,6,7,8,9]. Supramolecular architectures of phenylene bis-diethyl dioxalamates are driven by N-H···O=C and C=O···H-O supramolecular synthons, which give rise to well-defined hydrogen bonding supramolecular patterns, such as tapes, sheets, columns, and helical supramolecular architectures [6,7,8,9,10,11,12]. Thus, the understanding of these intermolecular interactions is of great interest in the design of new compounds with applications in supramolecular chemistry [7], metallosupramolecular chemistry [13,14,15], gelling agents [16] and pharmaceutical cocrystal coformers [17].
Allergic reactions start when the allergens bind with the FcεRI receptor of immunoglobulin E (IgE), triggering the signals transduction reaction in mast cells and basophil cells, releasing inflammatory mediators [18,19]. Diphenylene diethyl dioxalamates 1-3 were reported and patented as antiallergic compounds [20,21,22]; however, there is no information about their crystal structure and supramolecular study. In this work, we report the crystal structure and the supramolecular study of three diphenylene bis-diethyl dioxalamates (1-3) (Figure 1). In addition, the intermolecular contacts present in the crystal packing were analyzed by the Hirshfeld surface plots [23]. The knowledge of the molecular structure of 1-3 compounds will allow the development of further studies to evaluate theoretically (docking studies) the antiallergic activity of 1-3 compounds.

2. Materials and Methods

2.1. Crystallization of Compounds 1-3

Compounds 1-3 are known [20,21,22]; they were prepared by reacting the corresponding diphenyl diamine with ethyl 2-chloro-2-oxoacetate in the presence of triethylamine (TEA) [4] (see Supplementary Materials). All the reagents were purchased from Aldrich (St. Louis, MO, USA).
Single crystals of 1 were obtained from the evaporation at room temperature of the filtered THF solution obtained after the reaction of 4,4′-diaminodiphenylmethane with ethyl 2-chloro-2-oxoacetate, meanwhile, single crystals of 2 and 3 were obtained from de evaporation at room temperature of THF solutions of purified 2 and 3. In the three cases, the THF used was not dried.

2.2. X-ray Diffraction

A summary of collection and refinement parameters of 1-3 crystal structures is listed in Table 1. Single crystal X-ray diffraction of 1 and 3 were carried out using a Bruker APEXII with Mo Kα radiation (λ = 0.71073 Å) diffractometer (Bruker, Karlsruhe, Germany), and 2 with a Nonuis Kappa CCD with Mo Kα radiation (λ = 0.71073 Å) (Bruker, Karlsruhe, Germany). The cell refinement and data reduction were carried out with the SAINT V8.34A [24]. The structure was solved by direct methods using SHELXL97 [25]. Mercury software [26] was used to prepare the material for publication. H atoms on C and N were geometrically positioned and treated as riding atoms with C-H 0.95−0.99 Å, Uiso(H) = 1.2 Ueq(C) or 1.5 Ueq(C); N-H = 0.88 Å, Uiso(H) = 1.2 Ueq(N). The O-ethyl fragment of compound 2 was disordered over two positions. Both components were refined using restraints applied to the bond distances; the final occupancy factors were 0.612 (18): 0.388 (18) [27].

2.3. Computational Details

Geometry optimizations of 1-3 were performed in their anti and syn (Figure 2) conformations within the framework of the density functional theory in ORCA computational package [28], using a def2-TZVP basis set [29,30]. For the exchange and correlation, the ωB97X-D3 functional [31] was employed. These systems where evaluated in vacuum within the Conductor-like Polarizable Continuum Model (CPCM) [32,33]. All minimal energy states were verified with a calculation of harmonic vibrational frequencies, finding only positive values. The images were rendered by the molecular visualizer Chemcraft [34].
The Hirshfeld surfaces and 2D fingerprints calculations were obtained in Crystal Explorer 3.1 [35] using a Thakkar basis set [36] and employing CIF’s archives collected of 1-3 crystal structures. The graphs of Hirshfeld’s molecular surfaces were mapped with dnorm using a scheme colors, where the red one represents the shortest contacts, the white color indicates intermolecular distances close to the van der Waals contacts with dnorm equal to zero, and the blue color shows the contacts longer than the sum of the van der Waals radii with positive dnorm values [23,37].

3. Results and Discussion

3.1. Crystal Structure of Compounds 1-3

The two ethyl oxalamate groups in each molecule can adopt the syn or anti conformation, depending on their position relative to the perpendicular plane of the diphenyl rings (Figure 2). In the crystal structures of 1 and 2 the syn conformation is adopted, whereas in 3 the anti conformation is observed. The ethyl oxalamate side arms are twisted from the mean plane of the phenyl ring showing torsion angles ranging from 152° to 166°.
In compounds 1-3, the carbonyl groups of the C=O-C=O fragment adopt the anti conformation usually observed in oxalic acid derivatives [4,5,6,7,8], with torsion angles ranging from 162° to 178° (Table S1 Supporting Materials). Intramolecular hydrogen bonding allows the formation of S(5) and S(6) motifs [38] whose geometric parameters are listed in Table S2 of Supporting Materials.
Cocrystal 12•½(C2H2O4)•H2O crystallized in the triclinic space group P-1. In the unit cell, four molecules of 1 co-crystallized with one molecule of oxalic acid and two water molecules. Oxalic acid and water were unexpectedly incorporated into the crystalline lattice from the synthesis residues and the not dried solvent, respectively. The asymmetric unit comprises two independent molecules of 1 (1a and 1b, Figure 3), one molecule of water, and the molecule of oxalic acid lying on the center of symmetry. The torsion angles between the planes of the phenyl rings for the twin independent molecules of 1 are quite different: C4-C13-C17-C16 is −86.4(2)° and C29-C38-C42-C43 is 43.0(3)° around the O=C-C=O group, for 1a and 1b, respectively. Compound 1 is non-linear, with the Ar-CH2-Ar angles being 111.1(2)° (C4-C13-C17) for 1a and 115.9(2)° (C29-C38-C42) for 1b. These values are in agreement with the reported values for similar compounds [39,40]. The ethyl oxalamate groups are somewhat twisted out of the plane of the aromatic ring, as can be seen from the torsion angles C2-C1-N7-C8 = −152.1(2)°, C15-C14-N20-C21 = −166.8(2)°, C27-C26-N32-C33 = 178.0(2)°, and C44-C39-N45-C46 = 175.4(2)°.
Compound 2 (Figure 4) crystallizes in the orthorhombic space group Pbnb, with the molecule lying across a two-fold axis, having C2 symmetry, thus only one half of the molecule is present in the asymmetric unit with Ar-O-Ar angle of 118.6(2)° (C4-O13-C4). The O=C-C=O and C2-C1-N7-C8 torsion angles are −165.4(2)° and −16.3(3)°, respectively, with the OEt group lying out of the plane of the oxalamate group.
Compound 3 crystallized in the space group P-1, with three molecules in the unit cell; the asymmetric unit (Figure 5) contains one complete molecule (3b) and one half of a second centrosymmetric molecule (3a). The absence of the spacer group between the aromatic rings results in the linear alignment of the phenyl rings. The phenyl rings in 3a are almost coplanar, the torsion angle C3-C4-C4′-C5′ is 2.0(5)° while the phenyl rings in 3b is significantly twisted with torsion angle C23-C24-C44-C45 of 14.1(4)°. The ethyl oxalamate groups are slightly out of the mean plane of the phenyl ring with torsion angles C2-C1-N7-C8 of −166.8(3)° in 3a and C22-C21-N27-C28 and C42-C41-N47-C48 of −157.0(2)°and −164.8(2)°, respectively.

3.2. Supramolecular Architectures of 12•½(C2H2O4)•H2O and 2-3

The geometric parameters associated with hydrogen bonding and non-covalent intermolecular interactions of cocrystal 12•½(C2H2O4)•H2O and compounds 2-3 are summarized in Table 2. Classic hydrogen bonding [41], C-H···O [42], C-H···π [43] or C=O···O=C [44] interactions are in agreement with accepted criteria. The patterns of hydrogen bonds are described according the graph set notation [38].
The zero dimensional array (0-D) of 12•½(C2H2O4)•H2O is given by pairing 1a and 1b molecules through self-complementary strong N20-H20···O34 and N32-H32···O22 hydrogen bond interactions depicting a R22(10) motif, similar to the diethyl N,N’-m-phenylenedioxalamate [10]. These hydrogen bonded 1a-1b pairs are linked by a set of three-centered hydrogen bond interactions O8···H45···O10 (N45-H45···O8 and N45-H45···O10), and H44···O8···H45 (C44-H44···O8 and N45-H45···O8), giving rise to R21(5) and R12(6) motifs, respectively. Water molecules, hydrogen bonded to the oxalic acid molecule, extend the first dimensional supramolecular array by the O70-H70B···O46, O61-H61···O70 hydrogen bonds depicting a supramolecular tape running along the b axis (Figure 6a). Propagation of the supramolecular tape by C-H···π (C18-H18···Cg(1) = 3.018 Å, Cg(1) = C26-C31) and C=O···C=O interactions (C21-O21···C34 = 2.931(3) Å) give rise to a supramolecular sheet extended in the bc plane, (Figure 6b).
The third dimension is extended by lone pair→π interactions (C8-O8···Cg(2) = 3.559 Å; Cg(2) = C1-C6) giving rise to a cross linked supramolecular array. This architecture is similar to the supramolecular arrangement of dimethyl-4,4-methylene-bis(phenylcarbamate) [40]. The presence of oxalic acid and water in the unit cell offer a greater possibility of intermolecular interactions. Despite this, it is worth noting that the characteristic amide-amide R22(10) motif remains as the driving interaction, in the self-assembly of 1, together with the three centered R21(5) and R12(6) interactions.
The supramolecular architecture of 2 is given by the self-assembly of 3:1 repetition units of 2, depicting a cross-linked supramolecular array. A central molecule of 2 is perpendicularly interlinked to three parallel molecules by N7-H7···O8 hydrogen bonds, forming C(4) hydrogen bond motifs, (Figure 7a). These interactions are reinforced by C9=O9···C8=O8 carbonyl-carbonyl interactions and C3-H3···Cg(2) interactions (Figure 7b), giving rise to a ribbon propagating along the direction of the b axis. Hydrophobic contacts between the -OEt fragments are given between the ribbons. The whole 2D and 3D supramolecular architecture of 2 is given by the propagation of the ribbons by the N7-H7···O8 hydrogen bond along in the plane ab, contrasting with the related compound 4,4′-oxo-bis(phenylcarbamic acid 1-methylethyl ester) [45] which forms supramolecular tapes of parallel 1:1 units via N-H···O hydrogen bonds showing a C(4) motif.
The first dimensional supramolecular architecture of 3 is given by a supramolecular tape of 3b molecules extended along the (-5 5 -3) plane in which 3b molecules are linked by the N27-H27···O49 hydrogen bond and C22-H22···O49 interaction, forming the three-centered hydrogen bond interaction H22···O49···H27 showing a R12(6) motif. The second dimension is given by the perpendicular zig-zagging tape of 3a molecules extended along the (4 4 −7) plane. They are linked through C8=O8···C9 carbonyl-carbonyl interactions (O8···C9 = 3.128(3), C8=O8···C9 angle = 111.0(2)°) and the C12-H12C···Cg(2) interaction, forming an angle with the tape of 3b molecules of 80.61° (Figure 8). The presence of two different molecules of 3 in the asymmetric unit, pointing to different crystallographic directions lead to the formation of the third dimensional supramolecular array showing cross linked tapes of 3a and 3b, linked through N7-H7···O48 hydrogen bond, and C2-H2···O48 and C32B···Cg(2) interactions (Figure 8).
The supramolecular architecture of 1-3 is driven by N-H···O=C hydrogen bonds and reinforced by C=O···C=O and C-H···π. It is worth to note the preference of 1 and 3 to form cross-linked supramolecular architectures because of the presence of two independent molecules in the asymmetric unit, as well as co-crystallization with oxalic acid and water molecules, in the case of compound 1.

3.3. DFT Calculations and Hirshfeld Surface Analysis

In order to understand the effect of supramolecular interactions in the crystal packing, the geometric optimization of structures 1-3 in anti and syn conformation was carried out (Figure 9). The calculations were performed both in gas phase.
Theoretical calculations revealed that the anti-conformation is the most favorable for compounds 1-3, being the average energy difference between the syn and anti forms of 5.578 kcal/mol, in the gas phase (Table 3). However, compounds 1 and 2 adopt the energetically unfavorable syn conformation, and compound 3, the anti. Thus, non-covalent interactions determine the conformation adopted by compounds 1-3 and direct the crystal packing.
The intramolecular hydrogen bonds lengths in syn and anti were also analyzed (Table 4). All the calculated data are very close to the hydrogen bonding distances found in crystals 1-3 (Table S2 Supporting Materials), obtaining the best results in the optimizations with CPCM, in all systems S(5) motifs were found.
Hirshfeld surface study and 2D fingerprints of 1-3 were carried out in order to obtain information about intermolecular contacts and their quantitative contribution the supramolecular self-assembly of 1-3 [35]. Figure 10 shows the Hirshfeld surfaces, shape indexes, and curvednesses of 1-3.
Short contacts corresponding to N-H···O=C hydrogen bonds are represented by big red dots, indicating the H-bond contacts are consistent with the experimental results. The fingerprint plots showed that the H···H contacts (interactions of ethyl groups with protons from the neighboring molecules) make the largest contribution to the Hirshfeld surface of 1-3 (Figures S1–S3 Supporting Materials). The O···H contacts are the second dominant interactions; this is in agreement with the crystal structures, since the C=O···H-N, C-H···O=C hydrogen bonds drive the supramolecular assemblies. C-H contacts in the form of C-H···π interactions and C···O contacts in the form of C=O···C=O interactions, complete the principal contributions to the Hirshfeld surfaces (Figure 11).

4. Conclusions

The N-H···O=C hydrogen bond is the interaction that drives the supramolecular assemblies in 1-3, and is reinforced by C-H···O=C, C-H···π and C=O···C=O interactions. The three compounds showed cross-linked supramolecular architecture, caused by the presence of two different molecules in the unit cell of 1 and 3, and the C2 symmetry in 2.
The presence of oxalic acid and water in the unit cell of 1 as consequence of the cocrystal formation, offer a greater possibility of formation of intermolecular interactions.
The syn conformation is preferred in 1 and 2, meanwhile compound 3 adopts the less stable anti conformation, indicating that non-covalent interactions determine the conformation adopted by compounds 1-3 and direct the crystal packing.
Hirshfeld surface study revealed that the H···H, O···H, C···O and C···H interactions stabilize the supramolecular self-assembly of 1-3.

Supplementary Materials

The following are available online at https://www.mdpi.com/2073-4352/10/11/1048/s1, Materials and instrumentation; Synthesis and characterization of 1-3; Table S1. Selected bond distances (Å) and angles (deg) for 1-3; Table S2. Intramolecular interactions in 12•½(C2H2O4)•H2O, 2 and 3; Figure S1. Fingerprints plots of the total and specific intermolecular contacts of 1; Figure S2. Fingerprints plots of the total and specific intermolecular contacts of 2; Figure S3. Fingerprints plots of the total and specific intermolecular contacts of 3.

Author Contributions

Conceptualization, manuscript writing, reviewing and editing, F.J.M.-M., I.I.P.-M., J.S.G.-G.; methodology, J.S.G.-G.; formal analysis, E.V.G.-B., N.E.M.-V.; software J.P.M.-S. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by Universidad de la Cañada, grant number PFI-05/17. CONACYT, grant number 255354 and Secretaría de Investigación y Posgrado del Instituto Politécnico Nacional (SIP-IPN). CONACYT “Red Temática de Química Supramolecular” Grant 271884. CGIC-UC (Coordinación General de Investigación Científica de la Universidad de Colima) and PRODEP-SEP.

Conflicts of Interest

The authors declare no conflict of interest.

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Crystals 10 01048 g001 550
Figure 1. Diphenylene bis-diethyl dioxalamates in this study.
Figure 1. Diphenylene bis-diethyl dioxalamates in this study.
Crystals 10 01048 g001
Crystals 10 01048 g002 550
Figure 2. Conformations adopted by the ethyl oxalamate groups in 1-3.
Figure 2. Conformations adopted by the ethyl oxalamate groups in 1-3.
Crystals 10 01048 g002
Crystals 10 01048 g003 550
Figure 3. Molecular structure of 1a and 1b at 30% of probability level showing the atom numbering scheme and the intramolecular interactions.
Figure 3. Molecular structure of 1a and 1b at 30% of probability level showing the atom numbering scheme and the intramolecular interactions.
Crystals 10 01048 g003
Crystals 10 01048 g004 550
Figure 4. Molecular structure of 2 at 30% of probability level showing the atom numbering scheme and the intramolecular interactions.
Figure 4. Molecular structure of 2 at 30% of probability level showing the atom numbering scheme and the intramolecular interactions.
Crystals 10 01048 g004
Crystals 10 01048 g005 550
Figure 5. Molecular structure of 3a and 3b at 30% of probability level showing the atom numbering scheme and the intramolecular interactions.
Figure 5. Molecular structure of 3a and 3b at 30% of probability level showing the atom numbering scheme and the intramolecular interactions.
Crystals 10 01048 g005
Crystals 10 01048 g006 550
Figure 6. (a) 1D supramolecular tape of 12•½(C2H2O4)•H2O involving N-H···O and O-H···O hydrogen bonds, and (b) C-H···π and C=O···C=O interactions.
Figure 6. (a) 1D supramolecular tape of 12•½(C2H2O4)•H2O involving N-H···O and O-H···O hydrogen bonds, and (b) C-H···π and C=O···C=O interactions.
Crystals 10 01048 g006
Crystals 10 01048 g007 550
Figure 7. (a) Supramolecular cross-linked tape formed by 3:1 units of 2 running along the b axis. (b) C-H···π interactions in 2.
Figure 7. (a) Supramolecular cross-linked tape formed by 3:1 units of 2 running along the b axis. (b) C-H···π interactions in 2.
Crystals 10 01048 g007
Crystals 10 01048 g008 550
Figure 8. Supramolecular sheet of cross linked molecules of 3 formed by the N-H···O hydrogen bonds, and C-H···O, C-H···π and C=O···C=O interactions.
Figure 8. Supramolecular sheet of cross linked molecules of 3 formed by the N-H···O hydrogen bonds, and C-H···O, C-H···π and C=O···C=O interactions.
Crystals 10 01048 g008
Crystals 10 01048 g009 550
Figure 9. Optimized structures of 1-3 molecules in syn (a) and anti (b) conformation in the gas phase. Optimized structures were obtained at a ωB97X-D3/def2-TZVP level theory.
Figure 9. Optimized structures of 1-3 molecules in syn (a) and anti (b) conformation in the gas phase. Optimized structures were obtained at a ωB97X-D3/def2-TZVP level theory.
Crystals 10 01048 g009
Crystals 10 01048 g010 550
Figure 10. Hirshfeld surfaces from different perspectives for crystal structures 1-3.
Figure 10. Hirshfeld surfaces from different perspectives for crystal structures 1-3.
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Crystals 10 01048 g011 550
Figure 11. Relative contributions to the Hirshfeld surfaces for the major intermolecular contacts in 1-3.
Figure 11. Relative contributions to the Hirshfeld surfaces for the major intermolecular contacts in 1-3.
Crystals 10 01048 g011
Table
Table 1. Crystallographic data and refinement for 1-3.
Table 1. Crystallographic data and refinement for 1-3.
Parameter12•½(C2H2O4)•H2O23
CCDC795132795130795134
Chemical formula2(C21H22N2O6)•0.5(C2H2O4)•H2O C20H20N2O72(C20H20N2O6)
Mr molecular weight859.84400.38768.77
Crystal system, space groupTriclinic, P-1Orthorhombic, PbnbTriclinic, P-1
Temperature (K)173173293
a, b, c (Å)10.455 (2), 13.174 (3), 16.443 (3)7.9088 (2), 8.5779 (3), 28.4375 (9)8.5431 (11), 10.7978 (13), 16.105 (2)
α, β, γ (°)87.97 (3), 81.08 (3), 70.51 (3)90, 90, 90108.892 (2), 93.354 (2), 90.916 (2)
V (Å3)2108.9 (8)1929.23 (10)1402.3 (3)
Z243
Crystal size (mm)0.40 × 0.30 × 0.250.50 × 0.35 × 0.210.48 × 0.44 × 0.39
Tmin, Tmax0.861, 0.8620.861, 0.8620.861, 0.862
No. of measured, independent and observed [I > 2σ(I)] reflections20,384, 7437, 63805598, 1973, 138013,452, 4922, 4303
Rint0.0260.0330.029
(sin θ/λ)max (Å−1)0.5950.650.595
R[F2 > 2σ(F2)], wR(F2), S0.051, 0.123, 1.120.056, 0.141, 1.060.064, 0.167, 1.13
No. of reflections743719734922
No. of parameters591160379
No. of restraints460
Δρmax, Δρmin (e Å−3)0.18, −0.200.13, −0.120.25, −0.25
Table
Table 2. Intermolecular interactions for 12•½(C2H2O4)•H2O and 2-3.
Table 2. Intermolecular interactions for 12•½(C2H2O4)•H2O and 2-3.
Comp.D―H∙∙∙AD―H/ÅH···A/ÅD···A/ÅD―H···A/°
12•½(C2H2O4)•H2ON7-H7∙∙∙O60 i0.882.162.980(2)154
N20-H20∙∙∙O34 ii0.882.243.045(2)151
N32-H32∙∙∙O22 ii0.882.373.153(3)148
N45-H45∙∙∙O8 i0.882.223.063(2)159
N45-H45∙∙∙O10 i0.882.453.037(2)125
O61-H61∙∙∙O700.841.732.569(2)178
O70-H70A∙∙∙O80.862.022.864(2)167
O70-H70B∙∙∙O46 iii0.822.032.819(2)159
O70-H70B∙∙∙O48 iii0.822.543.141(2)131
C44-H44∙∙∙O8 i0.952.563.367(3)143
C18-H18∙∙∙Cg(1) v0.953.0183.848147
2N7-H7∙∙∙O8 iv0.862.293.082(2)154
C3-H3∙∙∙Cg(2) ix0.933.2684.104151
3N7-H7∙∙∙O48 v0.862.203.019(3)158
N27-H27∙∙∙O49 vi0.862.503.232(3)143
C2-H2∙∙∙O48 viii0.932.443.210(3)140
C22-H22∙∙∙O49 vi0.932.543.374(3)149
C12-H12C ∙∙∙Cg(2) x0.983.2859.979131
C32-H32B∙∙∙Cg(2) xi0.963.2134.012142
Symmetry codes: (i) -x+1,-y+1,-z; (ii) -x+1,-y+2,-z+1; (iii) x-1,y+1,z; (iv) -x+1/2, y+1/2,z; (v) x-1, y, z; (vi) x-1, y-1, z; (vii) -x+3, -y+1, -z+1; (viii) x-1, y, z; (ix) x,-1/2+y,1/2-z; (x)-x,1-y,-z; (xi) 1-x,1-y,1-z. Cg(1) = C26-C31, Cg(2) = C1-C6.
Table
Table 3. Relative energies (kcal/mol) for the syn and anti conformations for 1-3.
Table 3. Relative energies (kcal/mol) for the syn and anti conformations for 1-3.
CompoundIn Gas Phase (kcal/mol)
synanti
15.6110
25.6170
35.5050
Table
Table 4. Average intramolecular hydrogen bonds lengths (Å) in 1-3 of DFT optimized structures.
Table 4. Average intramolecular hydrogen bonds lengths (Å) in 1-3 of DFT optimized structures.
Molecule/InteractionGas Phase (Å)
synanti
1
N7-H7···O92.0602.104
2
N7-H7···O92.0592.102
3
N7-H7···O92.0592.103
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González-González, J.S.; Magaña-Vergara, N.E.; García-Báez, E.V.; Padilla-Martínez, I.I.; Mojica-Sánchez, J.P.; Martínez-Martínez, F.J. Crystal Structure and Supramolecular Architecture of Antiallergic Diphenylene Diethyl Dioxalamates. Crystals 2020, 10, 1048. https://doi.org/10.3390/cryst10111048

AMA Style

González-González JS, Magaña-Vergara NE, García-Báez EV, Padilla-Martínez II, Mojica-Sánchez JP, Martínez-Martínez FJ. Crystal Structure and Supramolecular Architecture of Antiallergic Diphenylene Diethyl Dioxalamates. Crystals. 2020; 10(11):1048. https://doi.org/10.3390/cryst10111048

Chicago/Turabian Style

González-González, Juan Saulo, Nancy Evelyn Magaña-Vergara, Efrén Venancio García-Báez, Itzia Irene Padilla-Martínez, Juan Pablo Mojica-Sánchez, and Francisco Javier Martínez-Martínez. 2020. "Crystal Structure and Supramolecular Architecture of Antiallergic Diphenylene Diethyl Dioxalamates" Crystals 10, no. 11: 1048. https://doi.org/10.3390/cryst10111048

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