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In the title compound, C25H12Cl6O4, the two carbonyl groups are oriented in a same direction with respect to the naphthalene ring system and are situated roughly parallel to each other, while the two 2,4,6-trichlorobenzene rings are orientated in opposite directions with respect to the naphthalene ring system: the carbonyl C—(C=O)—C planes subtend dihedral angles of 45.54 (15) and 30.02 (15)° to the naphthalene ring system are. The dihedral angles formed by the carbonyl groups and the benzene rings show larger differences, the C=O vectors being inclined to the benzene rings by 46.39 (16) and 79.78 (16)°. An intramolecular O—H...O=C hydrogen bond forms an S(6) ring motif. In the crystal, no effective intermolecular hydrogen bonds are found; instead, O...Cl and C...Cl close contacts are observed along the 21 helical-axis direction. The Hirshfeld surface analysis reveals several weak interactions, the major contributor being Cl...H/H...Cl contacts.

The title compound, C28H22N2O8, possesses crystallographically imposed twofold symmetry, with the two central carbon atoms of the naphthalene unit lying on the rotation axis. The two benzoyl groups in the molecule are twisted away from the attached naphthalene unit with a C—C—C=O torsion angle of 49.05 (15)° between the naphthalene unit and the carbonyl group. The dihedral angle between the naphthalene ring system and the benzene ring is 77.17 (5)°. In the crystal, pairs of C—H...O=C hydrogen bonds link the molecules into a double-column structure along the c axis. The molecules are further linked by C—H...O=N hydrogen bonds, forming a three-dimensional network. C—H...π interactions between the methylene group and the naphthalene unit and π–π interactions between the naphthalene ring systems [centroid–centroid distances of 3.7858 (7)–3.7860 (7) Å] are also observed.

In the crystal structure of the title compound, C5H14NO4P·H2O, the zwitterionic phosphocholine molecules are connected by an O—H...O hydrogen bond between the phosphate groups, forming a zigzag chain along the b-axis direction. The chains are further connected through O—H...O hydrogen bonds involving water molecules, forming a layer parallel to (101). Three and one C—H...O interactions are also observed in the layer and between the layers, respectively. The conformation of the N—C—C—O backbone is gauche with a torsion angle of −75.8 (2)°

In the title compound, C25H16Cl2O4·C2H6O, the two 4-chlorobenzoyl groups are in syn orientations with respect to the naphthalene ring system and are approximately parallel to each other: the dihedral angle between the benzene rings is 11.43 (16)°. The conformation around each of the carbonyl C—(C=O)—C groups forms a larger angle to the plane of the naphthalene ring system than that to the benzene ring; the angles of the C=O bond vector with the naphthalene ring system and the benzene ring are 55.4 (3) versus 13.5 (3)° and 52.2 (3) versus 17.9 (3)°. An intramolecular O—H...O=C hydrogen bond generates a six-membered ring. In the crystal structure, intermolecular O—H...O hydrogen bonds including the ethanol solvent molecule are observed. A C—H...O interaction also occurs. The ethyl group of the ethanol molecule is disordered over two positions with site occupancies of 0.63 and 0.37. The crystal studied was an inversion twin.

In the title compound, C18H12BrClO3, the naphthalene ring system and the benzene ring make a dihedral angle of 82.18 (9)°. The conformation around the central C=O group is such that the C=O bond vector forms a larger angle to the plane of the naphthalene ring system than to the plane of the benzene ring, viz. 60.91 (16)° versus 13.94 (16)°. In the crystal structure, two π–π interactions formed between the naphthalene ring systems [centroid–centroid distances of 3.8014 (13) and 3.9823 (13) Å] and intermolecular O—H...O and C—H...O hydrogen bonds are present.

Ipidacrine (2,3,5,6,7,8-hexahydro-1H-cyclopenta[b]quinolin-9-amine) was reacted with 4-methoxyphenyl isocyanate to give the title compound, C28H30N4O4. An intramolecular N—H...O hydrogen bond results in an essentially planar [r.m.s. deviation from the mean plane is 0.126 (1) Å] conformation for the biuret unit. The central ring of the quinoline unit is twisted by 78.2 (1)° with respect to the biuret mean plane, whereas the two 4-methoxybenzene rings are twisted out of this plane by 24.3 (1)° and 48.5 (1)°, resulting in an overall propeller-like structure. An intermolecular N—H...N hydrogen bond between the biuret NH atom and the quinoline ring nitrogen defines the crystal packing.

The title compound, C26H18F2O4, is a naphthalene derivative in which the two aroyl groups at the 1- and 8-positions (peri positions) are anti to each other. There is an appreciable difference in the dihedral angles between the naphthalene ring system and the two benzene rings [66.88 (7)° and 88.09 (6)°]. In the crystal, weak C—H...O interactions involving one of the carbonyl groups and an aromatic C—H group ortho to the F atom seem to stabilize the packing of the molecules.

In the title compound, C14H25NO11·2H2O, the primary hydroxyl group connected to the anomeric C atom of the N-acetyl-β-d-glucopyranose residue exhibits positional disorder, with occupancy factors for the α and β anomers of 0.77 and 0.23, respectively. The two torsion angles (Φ and Ψ) and the bridge angle (τ) that describe conformation of the glycosidic linkage between the galactopyranose and glucopyranose rings are Φ = −81.6 (3)°, Ψ = 118.1 (2)° and τ = 115.2 (2)°. Two water molecules stabilize the molecular packing by forming hydrogen bonds with the saccharide residues.

In the cystal structure of the title compound, (2-hydroxyethyl)trimethylammonium dihydrogen phosphate, C5H14NO+·H2PO4−, two anions create dimeric structures via two O—H...O hydrogen bonds. The hydrogen-bonded dimers are connected by another O—H...O hydrogen bond with the hydroxyl groups of the cations, constructing a columner structure along the a axis. A number of C—H...O interactions are also present.

In the crystal structure of the title compound, C4H12N+·H2PO4−·0.5H2O, the anions form an infinite hydrogen-bonded chain along the [1overline{1}0] direction. The anion chains are connected by water molecules, which lie on crystallographic twofold rotation axes, through O—H...O hydrogen bonds. These hydrogen bonds are almost perpendicular to the other hydrogen bonds which create an assembled structure of anions. In addition, C—H...O hydrogen bonds between anions and cations are observed.

The title compound, C18H13ClO3, has an intramolecular O—H...O=C hydrogen bond between the carbonyl group and the hydroxy substituent on the naphthalene ring system. The angle between the C=O bond plane and the naphthalene ring system is relatively small [20.96 (8)°]. The angle between the benzene ring and the carbonyl group is rather large [35.65 (9)°] compared to that in an analogous compound [3.43 (11)°] having a methoxy group instead of a hydroxy substituent.

The molecule of the title compound, C14H14O2, lies on a crystallographic twofold axis perpendicular to the central C—C bond; there is one half-molecule in the asymmetric unit. The angle between the least-squares planes of the two aromatic rings is 66.94 (7)°. The methoxy group, with a twist angle of 10.69 (8)°, is slightly out of the plane of the benzene ring. In the crystal structure, C—H...π interactions are observed between adjacent molecules along the c-axis direction.

In the title compound, C19H15ClO3, the dihedral angle between the naphthalene ring system and the benzene ring is 72.06 (7)°. The 4-chlorophenyl group and the carbonyl group are almost coplanar. An intermolecular C—H...O hydrogen bond is formed between an H atom of the 4-chlorophenyl group and the O atom of one methoxy group, forming a zigzag chain along the a axis.

The molecule of the title compound, C26H20O4, is located on a twofold rotation axis. The two benzoyl groups are situated in an anti orientation. The dihedral angle between the mean planes of the phenyl ring and the naphthalene ring system is 80.25 (6)°. The phenyl and carbonyl groups in each benzoyl group are almost coplanar. The molecular packing is stabilized by weak C—H...O hydrogen bonds and a π–π stacking interaction between the phenyl rings [centroid–centroid and interplanar distances of 3.6383 (10) and 3.294 Å, respectively].

The title compound, C26H20O4, has an asymmetrical conformation at 193 K. The 4-acetylphenyl groups are twisted away from the the naphthalene ring system, with one benzene ring turned towards the 1-position of the naphthalene ring and the other benzene ring turned towards the 6-position. The interplanar angles between the mean planes of the benzene rings and the naphthalene ring system are 68.71 (6) and 74.01 (6)°. The structure displays C—H...O hydrogen bonding and π–π stacking interactions [centroid–centroid and interplanar distances are 3.5938 (9) and 3.517 Å, respectively].

In the title compound, C19H15ClO3, the interplanar angle between the naphthalene and benzene ring systems is 62.67 (6)°. The carbonyl group is twisted from both ring planes, with torsion angles of −44.9 (2)° with respect to the naphthalene ring and −26.7 (2)° with respect to the phenylene ring. There is an intermolecular hydrogen bond between an H atom of one methoxy group and the O atom of the second methoxy group, forming chains along the ac diagonal.