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The asymmetric unit of title salt co-crystal, [K(C9H11N2S2)(C12H24O6)], comprises a K+ cation, an S2CN(Et)py anion and a 18-crown-6 mol­ecule. Substantial delocalization of π-electron density is evident in the di­thio­carbamate anion, as indicated by the equivalent C—S bond lengths. The K+ cation sits within an O6S2 donor set lying 0.7506 (6) Å out of the least-squares plane through the six O atoms (r.m.s. deviation = 0.1766 Å) of the 18-crown-6 mol­ecule with the two S atoms being on one side of this plane. Supra­molecular layers in the bc plane, sustained by C—H...O and C—H...π inter­actions, feature in the crystal packing.

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The title hydrated salt, C6H6NO2+·C10H5O8·H2O, was isolated from the 1:1 cocrystallization of benzene-1,2,4,5-tetra­carb­oxy­lic acid and isonicotinic acid in ethanol solution. In the crystal, the cation is close to planar [r.m.s. deviation = 0.085 Å for the nine fitted atoms; the C—C—C—O(carbon­yl) torsion angle = −8.7 (4)°], but twists are evident in the anion, with all but the carb­oxy­lic acid group diagonally opposite the carboxyl­ate group being significantly twisted out of the plane of the benzene ring [C—C—C—O(carbon­yl) torsion angles = −118.1 (2), −157.6 (2), 4.3 (3) and 77.3 (3)°]. In the crystal, the ions and water mol­ecules are consolidated into a three-dimensional architecture by O—H...O and N—H...O hydrogen bonding along with C—H...O inter­actions.

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The asymmetric unit of the title co-crystal, C10H6O8·2C8H10N4O2, comprises a centrosymmetric benzene-1,2,4,5-tetra­carb­oxy­lic acid (LH4) mol­ecule and a mol­ecule of caffeine in a general position. LH4 is nonplanar, with the dihedral angles between the ring and pendent carb­oxy­lic acid groups being 44.22 (7) and 49.74 (7)°. By contrast, the caffeine mol­ecule is planar (r.m.s. deviation = 0.040 Å). Supra­molecular layers parallel to (-1-10) are sustained by carb­oxy­lic acid O—H...O(carbon­yl) and O—H...N(imidazole) hydrogen bonds, as well as by meth­yl–carbonyl C—H...O inter­actions. These stack via π–π inter­actions between the benzene and imidazole rings [inter-centroid distance = 3.4503 (10) Å].

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The asymmetric unit of the title co-crystal, 2C14H13N2+·C10H4O82−·2C14H12N2·C10H6O8, comprises a 2,9-dimethyl-1,10-phenanthrolin-1-ium cation (Me2PhenH+) and a 2,9-dimethyl-1,10-phenanthroline mol­ecule (Me2Phen), each in a general position, and half each of a 2,5-di­carb­oxy­benzene-1,4-di­carboxyl­ate dianion (LH22−) and a benzene-1,2,4,5-tetra­carb­oxy­lic acid mol­ecule (LH4), each being disposed about a centre of inversion. Small twists are evident in the dianion [the C—C—C—O torsion angles are 168.41 (18) and 16.2 (3)°], whereas a major twist is found for one carb­oxy­lic acid group in the neutral mol­ecule [C—C—C—O = 66.3 (2) and 18.2 (3)°]. The most prominent feature of the crystal packing is the formation of linear supra­molecular chains along [001] mediated by charge-assisted O—H...O hydrogen bonding between alternating LH4 and LH22−. These are connected to the Me2PhenH+ and Me2Phen species by N—H...O and O—H...N hydrogen bonds, respectively. A three-dimensional architecture is formed by C—H...O and π–π inter­actions [inter-centroid distance = 3.5337 (17) Å].

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The asymmetric unit of title co-crystal, C10H8N2·2C7H7NO2, comprises a centrosymmetric 4,4′-bi­pyridine mol­ecule, and a 2-amino­benzoic acid mol­ecule in a general position. The latter is effectively planar [C—C—C—O torsion angle = 5.0 (3)°] owing to an intra­molecular N—H...O(carbon­yl) hydrogen bond. Three-mol­ecule aggregates are formed via O—H...N(pyrid­yl) hydrogen bonds and these are connected into supra­molecular layers in the bc plane by N—H...O(carbon­yl) hydrogen bonds and π–π inter­actions between pyridyl and benzene rings [inter-centroid distance = 3.634 (2) Å]. Layers are connected along the a axis by weak π–π inter­actions between benzene rings [3.964 (2) Å].

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The asymmetric unit of title co-crystal, C14H16N4S22+·2C7H3N2O6·4C7H4N2O6, comprises a centrosymmetric dipyridinium dication, a 2,6-di­nitro­benzoate anion and two independent 2,6-di­nitro­benzoic acid mol­ecules. The pyridin­ium rings are each approximately perpendicular to the central di­thio­amide unit [dihedral angle = 80.67 (12)°]. The carboxyl­ate/carb­oxy­lic acid groups are approximately perpendicular to the benzene ring to which they are attached [dihedral angles = 78.85 (16), 81.46 (19) and 71.28 (15)°]. By contrast, the major twist exhibited by a nitro group is manifested in a dihedral angle of 32.66 (17)°. The most prominent feature of the crystal packing is linear supra­molecular chains along [1-10], featuring O—H...O(carboxyl­ate) and pyridinium-N—H...O hydrogen bonds. These are consolidated into a three-dimensional architecture by thio­amide–nitro N—H...O, C—H...O and π–π [inter-centroid distance = 3.524 (2) Å] inter­actions. One of the nitro O atoms was refined over two sites; the major site was 0.65 (7) occupied.

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The asymmetric unit of the title salt, C12H14N22+·2C7H3N2O6, comprises half a 4-[2-(pyridin-1-ium-4-yl)eth­yl]pyridin-1-ium dication, being disposed about a centre of inversion, and a 2,6-di­nitro­benzoate anion, in a general position. In the anion, the carboxyl­ate group is inclined to the benzene ring [dihedral angle = 85.45 (9)°], whereas near-coplanar and twisted arrangements are found for the nitro groups [O—N—C—C torsion angles = 179.80 (14) and 20.2 (2)°]. In the crystal, three-component aggregates sustained by charge-assisted N+—H...O hydrogen bonds are found and these are consolidated into a three-dimensional architecture by C—H...O and π–π [inter-centroid distances = 3.6796 (14) and 3.7064 (14) Å] inter­actions.

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The asymmetric unit of the title co-crystal, C12H14N4O2S·0.5C6H12N2, comprises the sulfonamide mol­ecule and half a mol­ecule of 1,4-di­aza­bicyclo­[2.2.2]octane (DABCO), the latter being disposed about a crystallographic twofold rotation axis. In the sulfonamide mol­ecule, the aromatic rings are almost perpendicular to one another [dihedral angle = 75.01 (8)°]. In the crystal, mol­ecules are connected into a three-mol­ecule aggregate via amide–DABCO N—H...N hydrogen bonds, and these are connected into a three-dimensional architecture via amino–DABCO N—H...O and amino-pyrimidine N—H...N hydrogen bonds.

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The asymmetric unit of the title co-crystal, C12H12N2·2C7H7NO2, comprises a centrosymmetric 4-[2-(pyridin-4-yl)eth­yl]pyridine mol­ecule and a 2-amino­benzoic acid mol­ecule in a general position. The acid has a small twist between the carb­oxy­lic acid residue and the ring [dihedral angle = 7.13 (6)°] despite the presence of an intra­molecular N—H...O(carbon­yl) hydrogen bond. Three-mol­ecule aggregates are formed via O—H...N(pyrid­yl) hydrogen bonds, and these are connected into supra­molecular layers in the bc plane by N—H...O(carbon­yl) hydrogen bonds and π–π inter­actions between pyridine and benzene rings [inter-centroid distance = 3.6332 (9) Å]. Layers are connected along the a axis by weak π–π inter­actions between benzene rings [3.9577 (10) Å].
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