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In the title molecule, C13H16N4O3, the mean planes of the phenyl and triazole rings are nearly perpendicular to one another as a result of the intramolecular C—H...O and C—H...π(ring) interactions. In the crystal, layers parallel to (101) are generated by O—H...N, N—H...O and N—H...N hydrogen bonds. The layers are connected by inversion-related pairs of C—H...O hydrogen bonds. The experimental molecular structure is close to the gas-phase geometry-optimized structure calculated by DFT methods. Hirshfeld surface analysis indicates that the most important interaction involving hydrogen in the title compound is the H...H contact. The contribution of the H...O, H...N, and H...H contacts are 13.6, 16.1, and 54.6%, respectively.

In the title molecule, C17H23NO2, the dihydroindole portion is planar (r.m.s. deviation = 0.0157 Å) and the nonyl substituent is in an `extended' conformation. In the crystal, the nonyl chains intercalate and the dihydroindoledione units are associated through C—H...O hydrogen bonds to form micellar blocks. Based on the Hirshfeld surface analysis, the most important intermolecular interaction is the H...H interaction.

In the crystal, the 1-decyl chains are in a ‘fully extended’ conformation and inter­calate in the crystal packing to form hydro­phobic bands. The packing is further organized by π–π-stacking and C=O⋯π-ring inter­actions. The inter­molecular inter­actions were investigating by Hirshfeld surface analysis., In the title mol­ecule, C21H25N3O, the 1-decyl substituents are in an extended conformation and inter­calate in the crystal packing to form hydro­phobic bands. The packing is further organized by π–π-stacking inter­actions between pyrrole and phenyl rings [centroid–centroid distance = 3.6178 (11) Å] and a C=O⋯π(pyrrole) inter­action [3.447 (2) Å]. Hirshfeld surface analysis indicates that the H⋯N/N⋯H inter­actions make the highest contribution (17.4%) to the crystal packing.

The asymmetric unit of the title compound, C14H11N3O3, consists of two independent molecules having very similar conformations in which the indazole moieties are planar. The independent molecules are distinguished by small differences in the rotational orientations of the nitro groups. In the crystal, N—H...O and C—H...O hydrogen bonds form zigzag chains along the b-axis direction. Additional C—H...O hydrogen bonds link the chains into layers parallel to (10\overline{1}). These are connected by slipped π-stacking and C—H...π(ring) interactions.

In the title compound, C12H14N2O3, the conformation of the ester substituent is partially determined by an intramolecular N—H...O hydrogen bond. The crystal packing consists of layers parallel to (-112) held together by N—H...O and C—H...O hydrogen bonds. The CH/NH portion of the heterocyclic ring is disordered over two sites in a 0.930 (5):0.070 (5) ratio with the disorder also extending to the O atom involved in the intramolecular N—H...O hydrogen bond.

In the title molecule, C19H18N2O2, the orientation of the oxopropylidene substituent is largely determined by an intramolecular N—H...O hydrogen bond. In the crystal, C—H...O hydrogen bonds form zigzag chains, which are elaborated into sheets lying parallel to (101) by complementary C—H...π interactions. Comparisons to the structure of the triclinic modification are made.

The asymmetric unit of the title compound, C9H6ClN3O3, contains one full molecule in a general position and a half molcule sitting on a crystallographic mirror plane. In the crystal, molecules form stacks extending along theb-axis direction through a combination of offset π–π stacking between indazole units and C—Cl...π(ring) interactions with the six-membered rings of the same units. Elaboration of the C—Cl...π(ring) interactions along thea-axis direction forms slabs of molecules parallel to [001]. The stacks are joined by a combination of C—H...O and C—H...N hydrogen bonds.

The title compound, C20H30N2O2, has crystallographically imposed C 2 symmetry; the hexyl side chain adopts a tttg (t = trans and g = gauche) conformation. In the crystal, C—H...O hydrogen bonds link the molecules into chains extending along the b-axis direction. These chains pack to form zigzag sheets lying parallel to (101).

In the title compound, C15H11NO, the anthracene unit is slightly bowed. Inversion-related pairs of O—H...N hydrogen bonds form dimers that are stacked along theb-axis direction by offset π–π stacking interactions between the anthracene units.

In the title compound, C14H14N2O2, the dihydroquinoxaline moiety deviates slightly from planarity. In the crystal, zigzag chains are formed by inversion-related C—H...O hydrogen bonds. Adjacent chains are associated through pairwise C—H...π(ring) and π-stacking interactions.

In the title compound, C17H17N3O, the indolone ring system is almost planar, with an angle of 0.76 (14)° between the five- and six-membered rings. The dicyanomethylidene substituent lies close to the indolene plane. In the crystal, offset π-stacking interactions between five- and six-membered rings of indolene stack the molecules along thec-axis direction.

In the title compound, C9H8ClN3O2, the orientation of the ethyl substituent is partly determined by an intramolecular C—H...Cl hydrogen bond. The indazole moiety is slightly folded with an angle of 0.70 (8)° between the five- and six-membered rings. In the crystal, molecules pack in layers parallel to [100] through C—H...π(ring) and N...;O...π(ring) interactions.

In the title compound, C16H11N3O, the molecular conformation is partially determined by an intramolecular C—H...π(ring) interaction. In the crystal, pairwise N—H...N hydrogen bonds form dimers, which associate into stacks through a combination of C—H...O, C—H...π(ring) and offset π–π stacking interactions.

In the title compound, C8H11N5O, the triazepine ring displays a boat conformation. Its mean plane is inclined to the triazole ring by 22.10 (9)°. In the crystal, molecules are linked by C—H...O hydrogen bonds to form chains parallel to theb-axis direction. Inversion-related chains are linkedviaoffset π–π interactions between the triazole rings, forming ribbons propagating in theb-axis direction. The terminal CH3group is disordered over two sets of sites, with a refined occupancy ratio of 0.48 (6):0.52 (6).

In the crystal of the title molecular salt, C16H34N5+·Cl−, (100) bilayers arise in which the tetradecylamino `tails' (which adopt extended conformations) interdigitate and the triazolium `heads' associate with the chloride anions through N—H...Cl hydrogen bonds.

In the title compound, C24H36N2O2, the orientation of the 2-oxopropylidene substituent is determined by the formation of an intramolecular N—H...O hydrogen bond. The benzodiazepine seven-membered ring adopts a slightly twisted boat conformation. The molecules pack in a bilayer fashion with the dodecyl chains intercalated to form the inner portion, and the benzodiazepine moieties on the outer surfaces.

In the title omeprazole derivative, C20H21N3O3S, the benzimidazole ring is inclined to the pyridine ring by 21.21 (8)°. In the crystal, neighbouring molecules are linked by C—H...O hydrogen bonds, forming chains along thea-axis direction. Within the chains, there are offset π–π interactions [intercentroid distance = 3.880 (2) Å] involving neighbouring benzimidazole rings. There are no other significant intermolecular interactions present.

In the molecule of the title compound, C6H7N5S, the triazole ring is planar, while the triazepine ring displays a boat conformation. The dihedral angle between the mean plane through the triazole and triazepine rings is 18.48 (8)°. In the crystal, molecules are linked into centrosymmetric dimers by N—H...N hydrogen bondsviaeight-membered {...HNCN}2synthons. Supramolecular layers in theabplane are sustained by C—H...N and π–π interactions [inter-centroid separation between triazole rings = 3.2880 (16) Å]. Connections along thecaxis occur between S atoms [S...S = 3.5972 (16) Å].

In the title molecule, C18H16N2O2, the seven-membered diazepinone ring adopts a boat conformation. An intramolecular N—H...O hydrogen bond encloses anS(6) ring. The two propynyl substituents each point away from the same face of the benzodiazepinone ring system. In the crystal, C—H...O hydrogen bonds form double chains of molecules along thec-axis direction.