In the title compound, C17H11F3O2, the dihydroindene ring is approximately planar with a maximum deviation of 0.024 (2) Å and makes a dihedral angle of 3.17 (8) Å with the adjacent benzene ring. In the crystal, molecules are interconnected by C—H⋯O interactions, forming an infinite chain along the c axis.
The title compound, C20H19N3O, was obtained by condensation of 2,3-dihydro-1H,9H-pyrrolo[2,1-b]quinazolin-9-one (alkaloid deoxyvasicinone, isolated from Peganum Harmala) with 4-(dimethylamino)benzaldehyde in the presence of sodium methoxide. The 2,3-dihydro-1H,9H-pyrrolo[2,1-b]quinazolin-9-one part of the molecule is roughly planar (r.m.s. deviation = 0.0178 Å) and is essentially coplanar with the benzilidene ring (r.m.s. deviation = 0.0080 Å), forming a dihedral angle of 5.0 (1)°. The crystal structure is stabilized by two aromatic π–π stacking interactions observed between the benzene rings of neighboring molecules [centroid–centroid distance = 3.7555 (19) Å.
In the title compound, C16H11BrO, the dihydroindene ring system is approximately planar, with a maximum deviation of 0.008 (2) Å. The mean plane of this ring system forms a dihedral angle of 3.73 (11)°, with the bromo-substituted benzene ring. In the crystal, weak intermolecular C—H⋯O hydrogen bonds link the molecules into sheets parallel to the ab plane and further stabilization is provided by weak C—H⋯π interactions involving the bromo-substituted benzene rings.
In the title compound, C16H11ClO, the dihedral angle between the almost planar dihydroindene ring system (r.m.s. deviation = 0.009 Å) and the chlorobenzene ring is 3.51 (14)°. In the crystal, molecules are connected by C—H⋯O and weak C—H⋯Cl interactions, forming infinite layers parallel to (101).
The molecular structure of the title compound, C18H16O3, is roughly planar; the maximum deviation of the indanone ring system is 0.027 (1) Å and it makes a dihedral angle of 2.69 (3)° with the phenyl ring. The torsion angles between the two methoxy groups and the indanone ring are −14.67 (11) and −1.11 (12)°. In the crystal, molecules are connected into a ribbon along the a axis via weak intermolecular C—H⋯O hydrogen bonds. Weak intermolecular C—H⋯π and π–π [centroid–centroid distance = 3.7086 (6) Å] interactions are also observed.
In the title compound, C21H21NO, the indene ring system is essentially planar with a maximum deviation of 0.066 (1) Å and makes dihedral angles of 7.93 (6) and 2.43 (6)°, respectively, with the benzene plane and the mean plane of the piperidine ring. These latter two planes make a dihedral angle of 7.61 (7)°. In the crystal, molecules are linked by C—H⋯O interactions, forming infinite chains along the b axis.
The title compound, C20H19N3O2, was obtained by the condensation of 4-(dimethylamino)benzaldehyde with 3-hydroxy-2-naphthohydrazide. The molecule is approximately planar, with an intramolecular N—H⋯O hydrogen bond involving the imino H atom and the hydroxy O atom. The dihedral angle between the benzene ring and the naphthyl mean plane is 2.72 (13)°. In the crystal structure, symmetry-related molecules are linked by intermolecular O—H⋯O hydrogen bonds, forming chains propagating in the c-axis direction.
In the asymmetric unit of the title compound, C16H16N4O3·H2O, there are two symmetry-independent hydrazide molecules with almost identical geometries, and two independent water molecules. The dihedral angles between the two benzene rings in the two hydrazide molecules are 0.11 (5) and 0.77 (5)°. In one molecule, an intramolecular C—H⋯O hydrogen bond generates a ring of graph-set motif S(5). Intermolecular N—H⋯O, O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds and π–π stacking interactions between the benzene rings [centroid–centroid distances in the range 3.5021 (6)–3.6403 (6) Å] are observed, together with O⋯O [2.7226 (11) Å], O⋯N [2.7072 (10) Å] and N⋯O [2.7072 (10)–2.8582 (12) Å] short contacts. The hydrazine molecules are stacked along the b axis and adjacent molecules are linked by water molecules.
In the title compound, C25H27N7O2·H2O, the bis[4-(dimethylamino)benzylidene]pyridine-2,6-dicarbohydrazide molecule and the water molecule are located on a twofold rotation axis. The benzene and pyridine rings form a dihedral angle of 17.13 (7)°. In the crystal, intermolecular N—H⋯O and O—H⋯O hydrogen bonds link the molecules into a two-dimensional supermolecular structure parallel to the ab plane.
In the title molecule, C17H11F3O, the indan ring system and the trifluoromethyl-substituted benzene ring are approximately individually planar and form a dihedral angle of 1.81 (5)° with each other. In the crystal, molecules are linked by pairs of weak bifurcated (C—H)2⋯O hydrogen bonds to form centrosymmetric dimers, generating R
1(6) and R
2(10) ring motifs. These dimers are connected by further weak C—H⋯O hydrogen bonds into one-dimensional chains along the b axis. Weak C—H⋯π interactions are also present.
In the title compound, C19H18N4O2, the 1,8-naphthyridine ring system is essentially planar [r.m.s. deviation = 0.011 (3) Å]. The dihedral angle between the naphthyridine ring system and the phenyl ring is 28.95 (7)°. The carbohydrazide H atom is involved in an intramolecular N—H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. In the crystal, the molecules arrange themselves into centrosymmetric dimers by means of intermolecular C—H⋯O hydrogen bonds.
The title compound, C14H15N3O2, was prepared by the reaction of 4-(dimethylamino)benzaldehyde and furan-2-carbohydrazide. The dihedral angle between the benzene ring and the furan ring is 25.59 (19)°. In the crystal, molecules are linked by intermolecular N—H⋯O hydrogen bonds, forming chains along .
The title compound, C16H17N3O2, was synthesized by the reaction of 4-dimethylaminobenzaldehyde with 3-hydroxybenzoic acid hydrazide in methanol. The dihedral angle between the two benzene rings in the molecule is 9.2 (2)°. In the crystal structure, molecules are linked through intermolecular O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds, forming layers parallel to the bc plane.
The title Schiff base compound, C17H19N3O2, was obtained from the condensation of 4-dimethylaminobenzaldehyde with 4-methoxybenzohydrazide in an ethanol solution. The molecule is twisted with respect to the N—N single bond [C—N—N—C = −159.27 (14)°] and the dihedral angle between the two aromatic rings is 67.1 (2)°. In the crystal structure, the molecules are linked into chains along the c axis by intermolecular N—H⋯O and C—H⋯O hydrogen bonds.
The title compound, C29H29NO3, the nearly planar nine-membered indanedione ring [maximum deviation = 0.027 (2) Å] is located approximately parallel to its carrier pyridine ring [maximum deviation = 0.021 (2) Å] with a dihedral angle of 1.8 (1)° between the planes. However, because of steric hindrance, the benzene ring [maximum deviation = 0.006 (2) Å] is not parallel to the pyridine ring [dihedral angle = 37.29 (8)°]. The molecules display numerous intermolecular π–π interactions between the five- and six-membered rings, the shortest centroid–centroid distance being 3.796 (2) Å. There are inter- and intramolecular O—H⋯O and C—H⋯O hydrogen bonds.
The title Schiff base compound, C15H17N3O2S, is non-planar with a dihedral angle of 69.88 (4)° between the planes of the benzene rings. In the crystal, pairs of N—H⋯N hydrogen bonds, between the sulfonamide nitrogen-H atom and the azomethine N atom, link the molecules into inversion dimers, forming R
2(16) ring motifs. These dimers are linked by N—H⋯O hydrogen bonds, between the sulfonamide nitrogen-H atom and one sulfonamide O atom, forming sheets lying parallel to (100). Within the sheets there are weak parallel slipped π–π interactions involving inversion-related benzenesulfonamide rings [centroid–centroid distance = 3.8800 (9) Å; normal distance = 3.4796 (6) Å; slippage = 1.717 Å].
In the title compound, C16H17N3O2·0.5H2O, the two hydrazide molecules are approximately planar: the dihedral angles between the two substituted benzene rings are 7.7 (2) and 4.2 (2)°. Both hydrazone molecules exist in a trans geometry with respect to their methylidene units. In the crystal, the water molecule lies between the two organic molecules and makes bifurcated O—H⋯(N,O) hydrogen bonds to both of them. The hydrazide molecules form N—H⋯O and O—H⋯O hydrogen bonds, resulting in a three-dimensional network.
In the title molecule, C30H30N4S2, the two benzene rings connected through the disulfide chain form a dihedral angle of 88.7 (1)°, and the two benzene rings in the benzylideneaniline fragments form dihedral angles of 34.0 (1) and 35.4 (1)°. The crystal packing exhibits no significantly short intermolecular contacts.
In the molecule of the title compound, C16H10BrFO, the indane ring system is planar with a maximum deviation of 0.020 (3) Å. An intramolecular C—H⋯O interaction results in the formation of a planar ring, which is oriented at dihedral angles of 2.24 (3) and 2.34 (3)° with respect to the adjacent rings. π–π contacts between the benzene and indane rings [centroid–centroid distances = 3.699 (1) and 3.786 (1)Å] may stabilize the crystal structure.
In the title compound, C16H16ClN3O·H2O, the dihedral angle between the two aromatic rings is 44.58 (11)°. The N atom of the dimethylamino group adopts a pyramidal configuration. In the crystal structure, molecules are linked into a two-dimensional network parallel to the (001) plane by intermolecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds involving the water molecule and C—H⋯Cl hydrogen bonds. In addition, C—H⋯π interactions are observed.
The molecule of the title Schiff base compound, C18H12Cl2F6N2, adopts an E configuration with respect to the azomethine C=N bond. Intramolecular C—H⋯F (× 2) and C—H⋯Cl (× 2) hydrogen bonds generate S(5) ring motifs. The imino group is coplanar with the aromatic ring. Within the molecule, the planar units are parallel, but extend in opposite directions from the methylene bridge, as indicated by the dihedral angle between the two benzene rings of 3.74 (6)°. The interesting features of the crystal structure are weak intermolecular Cl⋯N and F⋯F interactions, with distances of 2.9192 (11) and 3.2714 (10) Å, respectively, which are shorter than the sum of the van der Waals radii of the relevent atoms. These interactions link neighbouring molecules into dimers which are stacked down the b axis.
In the title molecule, C10H14N4S, the thiorea plane and benzene ring form a dihedral angle of 16.0 (3) Å. In the crystal structure, intermolecular N—H⋯S hydrogen bonds link the molecules into ribbons extended in the  direction; these incorporate inversion dimers.
In the title aromatic Schiff base compound, C15H15ClN2O, the molecule exists in a trans conformation with respect to the C=N bond. The dihedral angle between the benzene rings is 14.49 (6)°. In the crystal, weak C—H⋯π interactions link molecules into supramolecular chains propagated along the a-axis direction.
In the title molecule, C16H17N3O, the two aromatic rings form a dihedral angle of 4.51 (18)°. In the crystal structure, intermolecular N—H⋯O hydrogen bonds link molecules related by translation along the a axis into ribbons.
In the title compound, C17H19N3O2, the two benzene rings form a dihedral angle of 89.2 (2)°. In the crystal structure, molecules are linked through N—H⋯O hydrogen bonds, forming C(4) chains running along the c axis.