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The title mol­ecule, C13H8BrN3O5, is slightly twisted, with the dihedral angle between the two benzene rings being 5.9 (1)°. In the crystal, N—H...O hydrogen bonds link the mol­ecules into one-dimensional chains running along [101]. Further stabilization of the crystal structure is provided by π–π inter­actions [shortest centroid–centroid distance = 3.6467 (17) Å].

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The title mol­ecule, C16H13N3O7, is slightly twisted, with the dihedral angle between the two benzene ring planes being 17.4 (1)°. An intra­molecular N—H...O hydrogen bond is observed. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains along the b axis.

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The asymmetric unit of the title salt, C12H24N+·C7H3N2O6, contains two cations and two anions. In the crystal, the cations and anions are connected by N—H...O hydrogen bonds, forming a 12-membered ring with an R44(12) graph-set motif. The center of this 12-membered ring coincides with an inversion centre. π–π stacking is observed between parallel benzene rings [centroid–centriod distance = 3.771 (2) Å].

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In the title compound, C19H33NO, all three cyclo­hexane rings adopt chair conformations. The crystal packing features weak C—H...O inter­actions, forming a supra­molecular chain along the c axis.

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The title compound, C19H26N2O3, crystallizes with two independent mol­ecules in the asymmetric unit which differ in the twist of the phenyl rings with respect to the plane of the amide group [the C—C—C—O torsion angles are 121.5 (3) and −119.6 (3)° in the two mol­ecules. Both cyclo­hexane rings adopt chair conformations. In the crystal, weak C—H...O inter­actions occur. The crystal studied was a non-merohedral twin with a minor component of 4.8 (1)%.

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The title compound, C13H9ClN2O3, is almost planar, showing a dihedral angle of 4.63 (6)° between the aromatic ring planes. The nitro group also lies in the plane, the C—C—N—O torsion angle being 6.7 (2)°. There is an intamolecular C—H...O hydrogen bond. The crystal structure features N—H...O(nitro) hydrogen bonds that link the mol­ecules into zigzag chains extending along [010].

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The asymmetric unit of the title compound, C17H18N2O4, contains two independent mol­ecules (A and B) differing principally in the conformations of the alkyl chains, anti for molecule A and gauche for molecule B. The dihedral angles between the aromatic rings are 82.51 (6) and 82.25 (6)° in the two molecules. In the crystal, amide–amide inter­actions (as N—H...O=C) results in distinct chains of A and B mol­ecules running parallel to the a-axis direction. C—H...O inter­actions also occur.

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In the title compound, C19H25N3O5, the benzene ring is not coplanar with the amide group [dihedral angle = 61.90 (5)°]. The cyclo­hexyl rings are in chair conformations. There is a strong inter­molecular inter­action between the C=O group of the amide group and the nitro group of an adjoining mol­ecule, with a short O...N distance of 2.7862 (17) Å. In the crystal, C—H...O inter­actions occur along the [100] direction.

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The asymmetric unit of the title compound, C16H13N2O+·NCS·C16H12N2O, contains two N-(pyridin-4-yl)naphthalene-2-carboxamide mol­ecules, both are partially protonated in the pyridine moiety, i.e. the H atom attached to the pyridine N atom is partially occupied with an occupancy factor of 0.61 (3) and 0.39 (3), respectively. In the crystal, protonated and neutral N-(pyridin-4-yl)naphthalene-2-carboxamide mol­ecules are linked by N—H...N hydrogen bonding; the thio­cyanate counter-ion links with both protonated and neutral N-(pyridin-4-yl)naphthalene-2-carboxamide mol­ecules via N—H...S and N—H...N hydrogen bonding. The dihedral angles between the pyridine ring and naphthalene ring systems are 11.33 (6) and 9.51 (6)°, respectively. π–π stacking is observed in the crystal structure, the shortest centroid–centroid distance being 3.5929 (8) Å. The crystal structure was determined from a nonmerohedral twin {ratio of the twin components = 0.357 (1):0.643 (1) and twin law [-100 0-10 -101]}.

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In the title compound, C10H10N4O5S·C9H9N3O5, the amide groups of 3-(3,5-dinitro-benzo­yl)-1,1-dimethyl-thio­urea and N,N-dimethyl-3,5-dinitro-benzamide mol­ecules are oriented at dihedral angles of 39.13 (8) and 55.97 (11)°, respectively, to the attached benzene rings. In the crystal, the two mol­ecules are linked by an N—H...O hydrogen bond. Weak C—H...O link the mol­ecules into a sheet parallel to the bc plane. C—H...S inter­actions also occur.
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