In the title molecule, C13H7N3O8, the phenyl and benzene rings are rotated from the mean plane of the central ester group by 18.41 (9) and 81.80 (5)°, respectively. The dihedral angle between the rings is 80.12 (14)°. In the crystal, molecules are linked by weak C—H⋯O interactions, forming helical chains along .
In the title compound, C21H18O4, the outer benzyl rings are disordered over two resolved positions in a 0.50 ratio. The O—CH2 groups form dihedral angles of 4.1 (2) and 10.9 (4)° with the central benzene ring, adopting a syn–anti conformation with respect to this ring. In the crystal, the molecules are linked by O—H⋯O hydrogen bonds and weak C—H⋯O interactions, forming chains along .
In the title compound, C14H9N3O8, the benzene rings form a dihedral angle of 69.02 (5)°. The central ester group is rotated by 25.86 (9)° relative to the p-tolyl group. In the crystal, the molecules are linked by C—H⋯O interactions into helical chains along .
In the title molecule, C19H21BrN2O, the piperidone ring adopts a chair conformation with a total puckering amplitude Q
T of 0.554 (2) Å. The dihedral angle between the benzene rings is 64.10 (7)°. There are no significant intermolecular interactions.
In the title pyridine N-oxide derivative, C6H4N2O, the 4-cyano substituent almost lies in the mean plane of the pyridine ring (r.m.s deviation of all non-H atoms = 0.004 Å). This redetermination results in a crystal structure with significantly higher precision [N—O bond length is 1.2997 (15) compared with 1.303 (5) Å in the original] than the original determination, which was recorded using the multiple-film technique and visually estimated intensities [Hardcastle et al. (1974 ▶). J. Cryst. Mol. Struct.
4, 305–311]. The crystal structure features weak C—H⋯O and C—H⋯N interactions, which lead to the formation of chains that intersect each other parallel to (001).
In the title benzoate derivative, C14H9N3O8, the benzene rings form a dihedral angle of 87.48 (5)°. The central ester unit forms an angle of 19.42 (7)° with the methylbenzene ring, indicating a significant twist. In the crystal, the molecules are linked by weak C—H⋯O interactions forming a helical chain along .
The title compound, C12H10BrN3, is essentially planar (r.m.s. deviation of all non-H atoms = 0.0174 Å), with a dihedral angle of 0.5 (2)° between the two aromatic rings. In the crystal, molecules are linked by weak N—H⋯N interactions, forming a zigzag chain running parallel to .
In the title compound, C16H16BrN, the tricyclic carbazole system is essentially planar (r.m.s. deviation of all non-H atoms = 0.010 Å). The dihedral angle between the two outer carbazole rings is 1.1 (3)°. There are no directional intermolecular contacts in the crystal packing.
The asymmetric unit of the title compound, C16H13N3O2, contains two independent molecules in which the pyridine and benzene rings form dihedral angles of 81.7 (2) and 79.8 (2)°, indicating the twist in the molecules. In the crystal, weak C—H⋯N interactions link molecules into chains along .
In the crystal structure of the title compound, C13H8BrNO4, molecules are linked into chains along  by weak C—H⋯O hydrogen bonds and Br⋯O contacts [3.140 (4) Å]. The planes of the nitrated and brominated aryl rings form a dihedral angle of 64.98 (10)°, indicating a twist in the molecule.
In the title compound, C14H11BrO2, an ester formed from the reaction of 4-methylphenol with 4-bromobenzoylchloride, the dihedral angle between the benzene rings is 54.43 (7)°, indicating a twist in the molecule. In the crystal, weak C—H⋯O interactions link the molecules into supramolecular layers in the bc plane, and these are connected along the a axis by Br⋯Br contacts [3.6328 (5) Å].
In the title molecule, C10H11BrClNO, there is a twist between the mean plane of the amide group and the benzene ring [C(=O)—N—C—C torsion angle = −27.1 (3)°]. In the crystal, intermolecular N—H⋯O and weak C—H⋯O hydrogen bonds link the molecules into chains along .
In the title molecule, C11H14BrNO2, there is twist between the mean plane of the amide group and the benzene ring [the C—N—C—C torsion angle is −172.1 (2)°]. The amide H atom forms an intramolecular hydrogen bond with the Br atom. In the crystal, intermolecular O—H⋯O and weak C—H⋯O hydrogen bonds link molecules into a chain along .
In the title molecule, C11H14BrNO, there is twist between the mean plane of the amide group and the benzene ring [C(=O)—N—C C torsion angle = −31.2 (5)°]. In the crystal, intermolecular N—H⋯O and weak C—H⋯O hydrogen bonds link molecules into chains along . The methyl group H atoms are disordered over two sets of sites with equal occupancy.
The title compound, C10H11BrN2O3, exhibits a small twist between the amide residue and benzene ring [the C—N—C—C torsion angle = 12.7 (4)°]. The crystal structure is stabilized by weak N—H⋯O, C—H⋯Br and C—H⋯O interactions. These lead to supramolecular layers in the bc plane.
The asymmetric unit of the title compound, C8H8O2, contains two crystallographically independent molecules, which form dimers linked by O⋯H—O hydrogen bonds. The benzene rings in the dimers are inclined at a dihedral angle of 7.30 (8)° and both methyl groups display rotational disorder. This redetermination results in a crystal structure with significantly higher precision than the original determination [Ellas & García-Blanco (1963 ▶). Acta Cryst. 16, 434], in which the authors reported only the unit-cell parameters and space group, without any detailed information on the atomic arrangement. In the crystal, dimers are connected by weak C—H⋯O interactions, forming R
2(10) and R
4(18) rings along  and an infinite zigzag chain of dimers along the  direction also occurs.
The asymmetric unit of the title compound, C3H5N2
−·C3H4N2·H2O or H(C3H4N2)2
−·H2O, contains a diimidazolium cationic unit, one picrate anion and one molecule of water. In the crystal, the components are connected by N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds, forming a two-dimensional network parallel to (001). In addition, weak intermolecular C—H⋯O hydrogen bonds lead to the formation of a three-dimensional network featuring R
The title compound, C9H8O2S2, can be used as a chain transfer agent and may be used to control the behavior of polymerization reactions. O—H⋯O hydrogen bonds of moderate character link the molecules into dimers. In the crystal, the dimers are linked into sheets by C—H⋯O interactions, forming R
2(12) and R
2(8) edge-fused rings running parallel to . There are no intermolecular interactions involving the S atoms.
In the title 2:1 adduct, C14H10O4S2·0.5C10H8N2O2, which arose from an unexpected oxidation of a precursor, the dihedral angle between the aromatic rings in the disulfide is 82.51 (11)°. In the crystal, the molecules are linked by O—H⋯O, O—H⋯N and C—H⋯O interactions, generating sheets.
In the title salt, C3H5N2
−, the carboxylate group of the 4-aminobenzoate anion forms a dihedral angle of 13.23 (17)° with respect to the benzene ring. There are N—H⋯O hydrogen-bonding interactions between the anion and cation, and weak intermolecular C—H⋯O contacts with carboxylate O-atom acceptors of the 4-aminobenzoate anion result in extended three-dimensional R
4(22) and R
6(30) edge-fused rings along the ,  and  directions.
In the title compound, C3H5N2
−, the dihedral angle between the imidazolium ring and the plane formed by the fumarate anion is 80.98 (6)°. In the crystal structure, intermolecular O—H⋯O and N—H⋯O hydrogen bonds form extended chains along  and , creating a two-dimensional network.
The title compound, C15H14O2, was obtained by Friedel–Crafts acylation between 2,5-dimethylphenol and benzoyl chloride in the presence of aluminium chloride as a catalyst. The dihedral angle between the benzene rings is 61.95 (4)°. In the crystal, O—H⋯O hydrogen bonding and C—H⋯O weak interactions lead to polymeric C(6), C(8) and C(11) chains along the a, b and c-axis directions, respectively.
The title adduct, C7H5NO4·C6H6N2O3, forms part of an ongoing study of the design of non-centrosymmetric systems based on 3-methy-4-nitropyridine 1-oxide. The components of the adduct are linked by intermolecular O—H⋯O hydrogen bonds. The rings of the two components are nearly planar, with a dihedral angle of 11.9 (2)° between the planes. The supramolecular structure shows that molecules of the title complex are linked into sheets by a combination of strong O—H⋯O and weak C—H⋯O hydrogen bonds.
In the title compound, C16H16BrN, the benzene rings are inclined to each other with a dihedral angle between their mean planes of 50.5 (3)° and the C=C bond adopts a cis conformation.
In the crystal of the title compound, C17H16N2, molecules are linked by C—H⋯N hydrogen bonds, forming rings of graph-set motifs R
1(6) and R
2(10). The title molecule is close to planar, with a dihedral angle between the aromatic rings of 0.6 (1)°. Torsion angles confirm a conformational trans structure.