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In the title compound, C17H12O4, there is an intramolecular O—H...O hydrogen bond. The dihedral angle between the indane ring system [maximun deviation = 0.023 (2) Å] and the benzene ring is 37.42 (9)°.

In the title compound, C8H12N4OS, an intramolecular N—H...O hydrogen bond links the imine N atom to the oxo O atom. In the crystal, molecules are linked by intermolecular N—H...O and N—H...S hydrogen bonds, forming a two-dimensional framework.

In the title compound, C12H11N3O3S·H2O, the pyridine ring makes a dihedral angle of 24.78 (14)° with the phenyl ring. Intramolecular N—H...O and intermolecular O—H...O hydrogen bonds are observed and stabilize the packing in the crystal structure.

The asymmetric unit of the title compound, (C24H26N2)[ZnCl4], consists of two 2,2′-(hexane-1,6-diyl)diisoquinolinium cations and two [ZnCl4]2− complex anions. The [ZnCl4]2− anions have a distorted tetrahedral geometry. The dihedral angles between the isoquinoline rings of the two cations are nearly equal [16.1 (2) and 16.3 (2)°]. In the crystal structure, the ordered linear formation is aggregated by weak intermolecular π–π stacking interactions between neighboring isoquinoline pyridine rings with a centroid–centroid distance of 3.779 (4) Å.

In the crystal of the title compound, [Ni(NO3)2(C18H10N4)(H2O)]·H2O, the NiII ion is coordinated in a distorted octahedral geometry by two N atoms of the 1,10-phenanthroline moiety of the ligand, three O atoms from two nitrate anions and an O atom from one water molecule. O—H...O hydrogen bonds between the coordinated and the solvent water molecules and between these water molecules and the nitrate O atoms help to establish the crystal packing.

The organic cation of the title salt, C17H12N4O2+·2Cl−·H2O, is nearly planar, the dihedral angle between two pyridine rings being 2.53 (16)° and that between the pyridinum and furan rings being 4.17 (19)°. Molecules are linked via N—H...O, N—H...Cl and O—H...Cl hydrogen bonds, forming a three-dimensional framework and π–π stacking interactions help to stabilize the crystal structure [the imidazole–pyridine and imidazole–benzene centroid–centroid distances are 3.501 (3) and 3.674 (3) Å; respectively].

The asymmetric unit of the title compound, C16H24Br2N2O2, contains two independent molecules, each which has two intramolecular N—H...O hydrogen bonds linking the amine N atoms to the enolic O atoms of the same acacH-imine unit. In the crystal, the molecules are lined up by intermolecular weak C—H...O hydrogen bonds, forming two vertical each other two-dimensional chains along the a axis and b axis of the unit cell, respectively.

The crystal of the title compound, (C22H22N2)[ZnCl4], consists of 2,2′-(butane-1,4-diyl)diisoquinolinium organic cations and [ZnCl4]2− complex anions. The cation is located across a twofold axis and the ZnII atom of the anion is located on the other twofold axis. The centroid–centroid distance between parallel pyridine rings of neighboring molecules is 3.699 (3) Å, but the face-to-face separation of 3.601 (3) Å suggests there is no significant π–π stacking in the crystal structure.

The molecules of the title compound, C15H16N2O4, are linked via N—H...O hydrogen bonds, forming undulating one-dimensional chains. Adjacent chains are linked by weak C—H...π interactions, forming a three-dimensional network.

In the title compound, C10H12N8O4·H2O, prepared from the reaction of glycoluril with paraformaldehyde, the organic molecule has mm symmetry. The asymmetric unit comprises one quarter of the molecule and a half-molecule of water. The dimer is formed by bridging two glycoluril molecules with methylene groups at the 1 and 6 positions. In the crystal structure, molecules are linked via N—H...O and O—H...O hydrogen bonds, forming a two-dimensional framework.

In the structure of the title compound, C37H40N4O8, pentaerythrityltetramine is bonded to four o-vanillin molecules, forming a four-armed Schiff base molecule. These molecules are connected by intermolecular C—H...O hydrogen bonds. Intramolecular C—H...N and O—H...N hydrogen bonds are also present.

In the crystal structure of the title compound, C6H8N2O·CH4N2O·H2O, molecules are linked via N—H...O, O—H...N and O—H...O hydrogen bonds, forming a three–dimensional framework.

In the crystal structure of the title compound, C13H11N4O3+·Cl−, the dihedral angle between the two pyridine rings is 9.72 (9) Å. Ions are linked via N—H...Cl, O—H...Cl and O—H...O hydrogen bonds, forming a three-dimensional framework.

The organic cation in the title compound, C24H32N42+·2Cl−·3H2O, is situated on an inversion centre. The cations, anions and water molecules are linked via N—H...O, N—H...Cl, O—H...O and O—H...Cl hydrogen bonds and C—H...π interactions, forming a three-dimensional framework.

The organic cation in the title compound, C14H18N22+·2Br−·2H2O, is situated on an inversion centre. The cations, anions and water molecules are linked via O—H...Br, C—H...Br and C—H...O hydrogen bonds, and π–π stacking interactions between adjacent pyridine rings, with a centroid–centroid separation of 3.8518 (17) Å.

The asymmetric unit of the title compound, C18H26N22+·2Br−·2H2O, consists of one-half of the organic cation, one Br− anion and one water molecule. The organic cation is situated on a centre of inversion. The dihedral angle between the pyridine ring and the plane of the central linkage is 59.3 (1)°. The cations, anions and water molecules are linked via O—H...Br, C—H...Br and C—H...O hydrogen bonds, forming a three-dimensional framework.

In the title compound, C17H14O6, the benzopyran ring system is essentially planar and forms a dihedral angle of 6.84 (4)° with the other benzene ring. In the crystal structure, centrosymmetrically related molecules are linked into dimers by O—H...O hydrogen bonds. The crystal packing is controlled by C—H...π and π–π stacking interactions involving the benzopyran and benzene rings, with centroid–centroid distances between 3.645 (2) and 3.986 (2) Å.