metal-organic compounds
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The asymmetric unit of the title polymeric complex, {[Sn2=(C6H5)6(C3H2O4)(H2O)]·C3H6O}n, comprises of two Sn cations, one malonate anion and a non-coordinating acetone solvent molecule. Both crystallographically independent Sn cations are five-coordinated by two O and three C atoms in a distorted trigonal-bipyrimidal geometry. One of the Sn cations is bridged by the malonate units, affording polymeric chains which run along [001]. Weak intramolecular C—Hπ interactions stabilize the molecular structure. In the crystal structure, adjacent chains are interconnected by intermolecular O—HO and C—HO hydrogen bonds into a three-dimensional supramolecular structure. A weak intermolecular C—Hπ interaction is also observed.
organic compounds
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In the title sydnone compound [systematic name: 3-(2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazol-4-yl)-1,2,3-oxadiazol-3-ium-5-olate], C13H12N4O3, the oxadiazole and pyrazole rings are essentially planar [maximum deviations = 0.006 (1) and 0.019 (1) Å, respectively] and are inclined at interplanar angles of 37.84 (4) and 46.60 (4)°, respectively, with respect to the benzene ring. In the crystal, adjacent molecules are interconnected into a three-dimensional supramolecular network via intermolecular C—HO hydrogen bonds. Weak intermolecular π–π aromatic stacking interactions [centroid–centroid distance = 3.5251 (5) Å] further stabilize the crystal packing.
organic compounds
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In the title compound, C10H8N2O3, the oxadiazole ring is essentially planar, with a maximum deviation of 0.006 (1) Å for the two-connected N atom. The mean planes through the aldehyde unit and the methyl-substituted phenyl ring make interplanar angles of 13.60 (9) and 59.69 (4)°, respectively, with the oxadiazole ring. In the crystal structure, adjacent molecules are interconnected into a two-dimensional array parallel to (100) by intermolecular C—HO hydrogen bonds.
organic compounds
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In the title sydnone compound, C24H18N6O3S {systematic name: 4-[3-(1-naphthyloxymethyl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazin-6-yl]-3-p-tolyl-4,5-dihydro-1,2,3-oxadiazol-3-ium-5-olate} an intramolecular C—HO hydrogen bond generates an S(6) ring motif. The 3,6-dihydro-1,3,4-thiadiazine ring adopts a twist-boat conformation. The essentially planar 1,2,3-oxadiazole and 1,2,4-triazole rings [maximum deviations of 0.006 (1) and 0.008 (1) Å, respectively] are inclined to one another at interplanar angle of 44.11 (4)°. The naphthalene unit forms an interplanar angle of 66.40 (4)° with the 1,2,4-triazole ring. In the crystal packing, pairs of intermolecular C—HO hydrogen bonds link adjacent molecules into dimers incorporating R22(12) ring motifs. Further stabilization is provided by weak C—Hπ interactions.
organic compounds
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In the title compound, C18H21NO3, the oxazolidine ring adopts an envelope conformation with the N atom at the flap position. The two benzene rings make dihedral angles of 74.27 (14) and 73.26 (15)° with the mean plane through the oxazolidine ring. In the crystal structure, O—HO and C—HO hydrogen bonds connect adjacent molecules into chains along [010] incorporating R22(8) loops and further stabilization is provided by weak intermolecular C—Hπ interactions.
organic compounds
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The title compound, C12H10BrN3O2S, exists in an E configuration with respect to the C=N bond. The approximately planar 2H-chromene ring system [maximum deviation = 0.059 (1) Å] is inclined at a dihedral angle of 17.50 (5)° with respect to the mean plane through the thiosemicarbazide unit and an intramolecular N—HN hydrogen bond generates an S(5) ring. In the crystal structure, adjacent molecules are linked by N—HS hydrogen bonds, forming [010] chains built up from R22(8) loops, such that each S atom accepts two such bonds. These chains are further interconnected into sheets parallel to the ab plane via short BrO interactions [3.0732 (13) Å] and a π–π aromatic stacking interaction [3.7870 (8) Å] is also observed.
organic compounds
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The title isoniazid derivative, C16H17N3O, exists in an E configuration with respect to the Schiff base C=N bond. The pyridine ring is essentially planar [maximum deviation = 0.009 (3) Å]. The mean plane through the hydrazide unit forms dihedral angles of 38.38 (16) and 39.42 (16)°, respectively, with the pyridine and benzene rings. In the crystal structure, symmetry-related molecules are linked via intermolecular N—HO hydrogen bonds into chains along [100]. The crystal structure is further stabilized by weak intermolecular C—Hπ interactions.
organic compounds
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In the title compound, C19H13N3O3S·0.5H2O, both organic molecules (A and B) exist in E configurations with respect to the acyclic C=N bond and have similar overall conformations. In molecule A, the essentially planar thiazole ring [maximum deviation = 0.010 (2) Å] is inclined at interplanar angles of 11.44 (10) and 32.50 (12)°, with the 2H-chromene ring system and the benzene ring, respectively. The equivalent values for molecule B are 0.002 (2) Å, 7.71 (9) and 12.51 (12)°. In the crystal structure, neighbouring molecules are interconnected into infinite layers lying parallel to (010) by O—HO, O—HN, N—HO and C—HO hydrogen bonds. Further stabilization of the crystal structure is provided by weak intermolecular C—Hπ and π–π [centroid–centroid distance = 3.6380 (19) Å] interactions.