A 1:2 co-crystal of 2,2'-thiodi-benzoic acid and tri-phenyl-phosphane oxide: crystal structure, Hirshfeld surface analysis and computational study

Crystal structure of the co-crystal 4-[(4-carboxyphenyl)disulfanyl]benzoic acid–(1E,4E)-1-N,4-N-bis(pyridin-4-ylmethylidene)cyclohexane-1,4-diamine (1/1), C14H10O4S2⋅C18H20N4

C32H30N4O4S2, monoclinic, I2/a (no. 15), a = 21.2034(7) Å, b = 5.0614(2) Å, c = 27.5987(12) Å, β = 105.991(4)°, V = 2847.3(2) Å3, Z = 4, R gt(F) = 0.0431, wR ref(F 2) = 0.1246, T = 100(2) K.

Crystal structure of cyclohexane-1,4-diammonium 2-[(2-carboxylatophenyl)disulfanyl]benzoate — dimethylformamide — monohydrate (1/1/1), [C6H16N2][C14H8O4S2] ⋅ C3H7NO⋅H2O

[C6H16N2][C14H8O4S2]⋅C3H7NO⋅H2O, triclinic, P1̄ (no. 2), a = 7.86120(10) Å, b = 12.2464(2) Å, c = 14.1615(2) Å, α = 111.293(1)°, β = 105.767(2)°, γ = 93.690(1)°, V = 1202.11(3) Å3, Z = 2, R gt(F) = 0.0373, wR ref(F 2) = 0.1054, T = 100(2) K.

Crystal structure of hemikis(cyclohexane-1,4-diammonium) (pyridine-2-carboxylate), [C6H16N2]0.5[C6H4NO2]

[C6H16N2]0.5[C6H4NO2], triclinic, P1̄ (no. 2), a = 6.7956(2) Å, b = 7.2840(3) Å, c = 10.2615(4) Å, α = 70.483(3)°, β = 80.902(3)°, γ = 66.404(3)°, V = 438.55(3) Å3, Z = 2, R gt(F) = 0.0359, wR ref(F 2) = 0.0988, T = 100(2) K.

Crystal structure of 2-(4-ammoniocyclohexyl)-3-(pyridin-2-yl)imidazo[1,5-a]pyridin-2-ium 2-[(2-carboxylatophenyl)disulfanyl]benzoate dihydrate, [C18H22N4][C14H8O4S2] ⋅ 2H2O

[C18H22N4][C14H8O4S2]⋅2H2O, orthorhombic, P212121 (no. 19), a = 9.7616(1) Å, b = 16.7411(2) Å, c = 18.6843(2) Å, V = 3053.39(6) Å3, Z = 4, R gt(F) = 0.0265, wR ref(F 2) = 0.0679, T = 100(2) K.

A 1:1:1 co-crystal solvate comprising 2,2'-di-thiodi-benzoic acid, 2-chloro-benzoic acid and N,N-di-methyl-formamide: crystal structure, Hirshfeld surface analysis and computational study

The three-component title compound contains a mol­ecule each of 2,2′-di­thiodi­benzoic acid (DTBA), 2-chloro­benzoic acid (2CBA) and di­methyl­formamide (DMF). The mol­ecules are connected via O—H⋯O hydrogen bonds between DTBA and 2CBA mol­ecules, and O—H⋯O hydrogen bonds between the second carb­oxy­lic acid of DTBA and the carbonyl group of the DMF mol­ecule.

The asymmetric unit of the three-component title compound, 2,2′-di­thiodi­benzoic acid–2-chloro­benzoic acid–N,N-di­methyl­formamide (1/1/1), C₁₄H₁₀O₄S₂·C₇H₅ClO₂·C₃H₇NO, contains a mol­ecule each of 2,2′-di­thiodi­benzoic acid (DTBA), 2-chloro­benzoic acid (2CBA) and di­methyl­formamide (DMF). The DTBA mol­ecule is twisted [the C—S—S—C torsion angle is 88.37 (17)°] and each carb­oxy­lic group is slightly twisted from the benzene ring to which it is connected [CO₂/C₆ dihedral angles = 7.6 (3) and 12.5 (3)°]. A small twist is evident in the mol­ecule of 2CBA [CO₂/C₆ dihedral angle = 4.4 (4)°]. In the crystal, the three mol­ecules are connected by hydrogen bonds with the two carb­oxy­lic acid residues derived from DTBA and 2CBA forming a non-symmetric eight-membered {⋯HOCO}₂ synthon, and the second carb­oxy­lic acid of DTBA linked to the DMF mol­ecule via a seven-membered {⋯HOCO⋯HCO} heterosynthon. The three-mol­ecule aggregates are connected into a supra­molecular chain along the a axis via DTBA-C—H⋯O(hydroxyl-2CBA), 2CBA-C—H⋯O(hydroxyl-DTBA) and DTBA-C—H⋯S(DTBA) inter­actions. Supra­molecular layers in the ab plane are formed as the chains are linked via DMF-C—H⋯S(DTBA) contacts, and these inter-digitate along the c-axis direction without specific points of contact between them. A Hirshfeld surface analysis points to additional but, weak contacts to stabilize the three-dimensional architecture: DTBA-C=O⋯H(phenyl-DTBA), 2CBA-Cl⋯H(phenyl-DTBA), as well as a π–π contact between the delocalized eight-membered {⋯HOC=O}₂ carb­oxy­lic dimer and the phenyl ring of 2CBA. The latter was confirmed by electrostatic potential (ESP) mapping.

Utilizing Hirshfeld surface calculations, non-covalent inter-action (NCI) plots and the calculation of inter-action energies in the analysis of mol-ecular packing

The analysis of atom-to-atom and/or residue-to-residue contacts remains a favoured mode of analysing the mol-ecular packing in crystals. In this contribution, additional tools are highlighted as methods for analysis in order to complement the 'crystallographer's tool', PLATON [Spek (2009). Acta Cryst. D65, 148-155]. Thus, a brief outline of the procedures and what can be learned by using Crystal Explorer [Spackman & Jayatilaka (2009). CrystEngComm 11, 19-23] is presented. Attention is then directed towards evaluating the nature, i.e. attractive/weakly attractive/repulsive, of specific contacts employing NCIPLOT [Johnson et al. (2010). J. Am. Chem. Soc. 132, 6498-6506]. This is complemented by a discussion of the calculation of energy frameworks utilizing the latest version of Crystal Explorer. All the mentioned programs are free of charge and straightforward to use. More importantly, they complement each other to give a more complete picture of how mol-ecules assemble in mol-ecular crystals.

A 1:2 co-crystal of 2,2'-di-thiodi-benzoic acid and benzoic acid: crystal structure, Hirshfeld surface analysis and computational study

The asymmetric unit of the title 1:2 co-crystal, C14H10O4S2·2C7H6O2, comprises half a mol-ecule of di-thiodi-benzoic acid [systematic name: 2-[(2-carb-oxy-phen-yl)disulfan-yl]benzoic acid, DTBA], as the mol-ecule is located about a twofold axis of symmetry, and a mol-ecule of benzoic acid (BA). The DTBA mol-ecule is twisted about the di-sulfide bond [the C-S-S-C torsion angle is -83.19 (8)°] resulting in a near perpendicular relationship between the benzene rings [dihedral angle = 71.19 (4)°]. The carb-oxy-lic acid group is almost co-planar with the benzene ring to which it is bonded [dihedral angle = 4.82 (12)°]. A similar near co-planar relationship pertains for the BA mol-ecule [dihedral angle = 3.65 (15)°]. Three-mol-ecule aggregates are formed in the crystal whereby two BA mol-ecules are connected to a DTBA mol-ecule via hy-droxy-O-H⋯O(hydroxy) hydrogen bonds and eight-membered {⋯HOC=O}2 synthons. These are connected into a supra-molecular layer in the ab plane through C-H⋯O inter-actions. The inter-actions between layers to consolidate the three-dimensional architecture are π-π stacking inter-actions between DTBA and BA rings [inter-centroid separation = 3.8093 (10) Å] and parallel DTBA-hy-droxy-O⋯π(BA) contacts [O⋯ring centroid separation = 3.9049 (14) Å]. The importance of the specified inter-actions as well as other weaker contacts, e.g. π-π and C-H⋯S, are indicated in the analysis of the calculated Hirshfeld surface and inter-action energies.