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In the title molecule, C14H20N2O, the piperidine ring has a chair conformation and its N atom is close to planar (bond-angle sum = 357.5°). The dihedral angle between the amide group and the aromatic ring is 47.43 (19)°. In the crystal, molecules are linked into [100] C(4) chains by N—H...O hydrogen bonds.

In the title molecule, C12H16N2O, the pyrrolidine ring has a half-chair conformation. In the crystal, molecules are linked into C(4) chains along [001] by N—H...O hydrogen bonds.

In the title molecule, C11H14ClN3O2, the morpholine ring has a chair conformation. In the crystal, pairs of molecules are linked into inversion dimers by N—H...O hydrogen bonds.

In the title molecule, C11H20N2S, the five-membered ring has an envelope conformation and the cyclohexane ring is in a chair conformation. The N—H group is not involved in any intra- or intermolecular interactions.

In the title compound, C8H8ClNO2, the dihedral angle between the chlorobenzene ring and the side chain is 8.79 (11)°. In the crystal, molecules are linked by N—H...O hydrogen bonds into a C(4) chain propagating in the b-axis direction.

In the title molecule, C13H18ClN3O, the piperazine ring has a chair conformation. In the crystal, molecules are linked into chains along [100] by N—H...O hydrogen bonds.

The title compound, C15H16ClN5O, contains two molecules, A and B, in the asymmetric unit, in which the dihedral angles between the terminal aromatic rings are 42.41 (17) and 45.77 (18)°. The central six-membered ring in both molecules has a chair conformation with equatorial substituents. In the crystal, molecules are linked into [100] C(4) chains of alternating A and B molecules by N—H...O hydrogen bonds.

In the title compound, C12H16ClN3O, the piperazine ring has a chair conformation. Within this ring, the N-methyl nitrogen atom has a pyramidal geometry and the N-carboxamide nitrogen atom is almost planar (bond-angle sum = 359.8°). In the crystal, the molecules are linked by N—H...O hydrogen bonds into C(4) chains propagating in [010].

In the title molecule, C11H13ClN2O2, the morpholine ring has a chair conformation. In the crystal, molecules are linked into chains along [100] by N—H...O hydrogen bonds.

In the title complex, [Co(C12H8N2)3](C2Cl3O2)2, the CoII ion lies on a twofold rotation axis and is coordinated by six N atoms from three bis-chelating 1,10-phenanthroline ligands in a distorted octahedral environment. The crystal structure is stabilized by weak intermolecular C—H...O hydrogen bonds.

In the title molecule, C11H13ClN2O, the five-membered ring has an envelope conformation. In the crystal, molecules are linked into chains along [100] by intermolecular N—H...O hydrogen bonds.

The asymmetric unit of the title compound, C7H8N2O3, contains two approximately planar molecules (r.m.s. deviations = 0.058 and 0.070 Å). In the crystal, molecules are linked into [010] chains by way of alternating N—H...O and N—H...(N,O) hydrogen-bond linkages.

In the title compound, C10H12ClN3S, the dihedral angle between the benzene ring and the thiourea unit is 2.35 (19)°. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds generate R22(8) loops.

The title compound, C10H13N3OS, was prepared by the reaction of 4-methoxybenzaldehyde and 4-methylthiosemicarbazide. The dihedral angle between the benzene ring and the thiourea unit is 8.64 (7)° and an intramolecular N—H...N hydrogen bond generates an S(5) ring. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds generate R22(8) loops. The dimers are linked into (001) sheets by further N—H...S links.

The title compound, C10H13N3S, prepared by the reaction of 4-methylbenzaldehyde and 4-methylthiosemicarbazide, is approximately planar (r.m.s. deviation for the non-H atoms = 0.032 Å). Its conformation is stabilized by an intramolecular N—H...N hydrogen bond, generating an S(5) ring. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds occur. Further weak N—H...S links connect the dimers into (100) sheets.

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 [010].

The title compound, C10H13N3S, was prepared by the reaction of 4-ethylthiosemicarbazide and benzaldehyde. The dihedral angle between the benzene ring and the thiourea unit is 8.96 (7)° and an intramolecular N—H...N hydrogen bond generates an S(5) ring. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds generate R22(8) loops.

The title compound, C12H17N3S, was prepared by the reaction of 4-ethylthiosemicarbazide and 3,4-dimethylbenzaldehyde. The dihedral angle between the thiourea unit and the benzene ring is 7.09 (8)°. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds occur.

The title compound, C10H11Cl2N3S, was prepared by the reaction of 4-ethylthiosemicarbazide and 2,4-dichlorobenzaldehyde. It is approximately planar, the dihedral angle between the benzene ring and the thiourea unit being 8.43 (18)°. In the crystal, inversion dimers linked by pairs of N—H...S hydrogen bonds generate R22(8) loops.

In the title compound, C13H12N2O2S·H2O, the dihedral angle between the aromatic rings is 35.34 (19)° and an intramolecular N—H...O hydrogen bond generates an S(5) ring. In the crystal, molecules are linked by N—H...O and O—H...O hydrogen bonds, generating (001) sheets.

The title compound, C14H14N2O2, was prepared by the reaction of 3,4-dimethylbenzaldehyde and furan-2-carbohydrazide. The dihedral angle between the aromatic rings is 35.48 (14)°. In the crystal, molecules are linked by N—H...O hydrogen bonds, generating C(4) chains propagating in [010].

In the title compound, C11H15N3OS, the dihedral angle between the aromatic ring and the thiourea unit is 4.28 (7)° and an intramolecular N—H...N hydrogen bond generates an S(5) ring. In the crystal, molecules are linked into (001) sheets by N—H...S hydrogen bonds.

In the title compound, C12H10N2O2S, the dihedral angle between the benzene and thiophene rings is 23.34 (16)°. In the crystal structure, molecules are linked by N—H...O and O—H...O hydrogen bonds, forming (100) sheets.

In the title compound, C13H9N3O2·H2O, the dihedral angle between the aromatic rings is 10.7 (4)° and an intramolecular N—H...O hydrogen bond occurs. In the crystal, the components are linked by N—H...O, O—H...N and O—H...O hydrogen bonds.

There are two molecules in the asymmetric unit of the title compound, C11H14N2O2, which have similar conformations. In the crystal, the molecules are linked by N—H...O hydrogen bonds, generating C(4) chains propagating in [001].

In the title compound, C12H10N2O2, the dihedral angle between the benzene ring and the furan ring is 24.6 (2)°. In the crystal, molecules are linked by N—H...O hydrogen bonds, generating C(4) chains propagating in [010].

In the title salt, C5H14NO+·C2F3O2−, the cation and anion are linked by N—H...O and O—H...N hydrogen bonds, generating a three-dimensional network.

The title compound, C10H12N2O2, was prepared by the reaction of methyl carbazate and 4-methylbenzaldehyde. The dihedral angle between the benzene ring and the carbazate fragment is 20.86 (10)°. In the crystal structure, molecules are linked by intermolecular N—H...O hydrogen bonds.

In the title compound, C11H16N4S, an intramolecular N—H...N hydrogen bond generates an S(5) ring. In the crystal, inversion dimers linked by pairs of N—H...S bonds occur, generating an R22(8) loop.

In the title compound, C13H12N2OS, the dihedral angle between the aromatic rings is 14.84 (17)°. In the crystal, inversion dimers linked by pairs of N—H...O hydrogen bonds generate R22(8) loops.

The molecular structure of the title compound, C9H10N6, exhibits four cyanomethyl groups around a central N—CH2—N unit. In the crystal structure, molecules are connected via intermolecular C—H...N hydrogen bonds, forming a three-dimensional network.

In the title compound, [Cu(C2HCl2O2)(C10H8N2)2](C2HCl2O2)·2H2O, the CuII ion is bonded to two N,N′-bidentate 2,2′-bipyridyl ligands and one O-monodentate 2,2-dichloroacetate anion in a distorted CuON4 trigonal-bipyramidal geometry, with the O atom occupying an equatorial site. In the crystal, the components are linked by O—H...O and O—H...Cl hydrogen bonds.

In the title compound, C25H20Br2N22+·2NO3−, the cation lies on a twofold rotation axis which imposes disorder of the dibromofluorene unit. In addition, the unique nitrate anion is disordered over two general sites of equal occupancy. The crystal structure is stabilized by intermolecular N—H...O hydrogen bonds.

In the crystal of the title compound, C8H9N3O2, molecules are linked by N—H...N hydrogen bonds, forming S(7) chains propagating in [010].

The title compound, C11H14N2O3, was prepared by the reaction of ethyl carbazate and 1-(2-hydroxyphenyl)ethanone. In the crystal structure, molecules are linked by intermolecular N—H...O hydrogen bonds, forming centrosymmetric dimers. An intramolecular O—H...N interaction also occurs.

The title compound, C10H10Cl2N2O2, was prepared by the reaction of ethyl carbazate and 2,4-dichlorobenzaldehyde. In the crystal structure, molecules are linked by intermolecular N—H...O hydrogen bonds, forming extended chains along [001].

In the crystal of the title compound, C9H10N2O2, the molecules are linked by N—H...O hydrogen bonds, generating S(4) chains propagating in [010].

In the title compound, [Cu(C2Cl3O2)2(C6H12N4)2], the CuII ion (site symmetry 2) is coordinated by two trichloroacetate anions and two hexamethylenetetramine molecules, resulting in a distorted CuN2O2 geometry that is intermediate between tetrahedral and square planar. The Cl atoms are disordered over two sets of sites, with relative occupancies of 0.749 (7) and 0.251 (7). In the crystal, the packing is consolidated by intermolecular C—H...O interactions.

In the title compound, C16H10O6, the complete molecule is generated by a crystallographic centre of symmetry. In the crystal, O—H...O hydrogen bonds link the molecules into (100) sheets and C—H...O links also occur.

In the title compound, C12H16N2O4, an intramolecular O—H...O hydrogen bond occurs. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming chains propagating in the [010] direction.

In the crystal of the title compound, C10H11BrN2O2, the molecules are linked by N—H...O hydrogen bonds, forming S(4) chains propagating in [100]. A C—H...O interaction also occurs.

The title compound, [Cu(C2HCl2O2)(C7H6N2)3(H2O)]C2HCl2O2·2H2O, was prepared by reaction of copper(II) 2,2-dichloroacetic acid and benzimidazole in ethanol solution. The compound shows a regular trigonal–bipyramidal stereochemistry. The CuII centre possesses a five-coordinated environment, coordinated by three N atoms from the three benzimidazole ligands and two O atoms, one from the dichloroacetate ligand and the other from the coordinated water molecule. The molecular structure and packing are stabilized by O—H...O and N—H...O hydrogen bonds. The Cl atoms are disordered over two sites, with relative occupancies 0.67 (3) and 0.33 (3).

The title compound, C30H26O2, was prepared by the reaction of a Wittig reagent and 2-methoxybenzaldehyde. The molecule lies about an inversion centre located at the midpoint of the C—C bond between the inner benzene rings. The crystal structure is stabilized by C—H...π interactions.

The title compound, C28H22O6S2·2C6H13N·2H2O, was prepared by the reaction of a Wittig reagent and 2-formylbenzenesulfonic acid. The main molecule lies about an inversion centre at the midpoint of the C—C bond between the inner benzene rings. The molecular conformation is stabilized by intramolecular hydrogen bonds. The crystal structure is further stabilized by O—H...O and N—H...O hydrogen-bonding interactions.

The title compound, C20H25NO4, was synthesized by a Mitsunobu reaction of sinomenine [(9S,13R,14R)-7,8-didehydro-4-hydroxy-3,7-dimethoxy-17-methylmorphinan-6-one] with methanol. The chiral centers were unchanged during the reaction. Intramolecular C—H...O hydrogen bonds result in the formation of six-membered rings.

The title compound, C10H11N3O3, was prepared by the reaction of acetohydrazide and 1-(4-nitrophenyl)ethanone. The asymmetric unit contains two crystallographically independent molecules. Inversion-related molecules form dimers, in which two N—H...O hydrogen bonds generate an intermolecular R22(8) ring.

In the title compound, C6H5IO3S·C4H9NO·H2O, N,N-dimethylacetamide and 4-iodobenzenesulfonic acidmolecules are linked by an intramolecular C—H...O hydrogen bond. In the crystal structure, intermolecular O—H...O, O—H...I and C—H...O hydrogen bonds link the molecules.

The title compound, C26H26N2O2S, was prepared by the reaction of thiophene-2,5-dicarboxylic acid and 2-amino-4-tert-butylphenol. One of the tert-butyl groups is disordered over two conformations, with occupancies of 0.539 (1) and 0.461 (2). The two 1,3-benzoxazole rings are almost planar, with dihedral angles of 0.83 (18) and 1.64 (17)° between the five- and six-membered rings. The thiophene ring makes dihedral angles of 21.54 (19) and 4.49 (18)° with the planes of the five-membered oxazole rings. The crystal packing is controlled by π–π stacking interactions involving the thiophene and benzene rings, with a centroid–centroid distance of 3.748 (2) Å.

The title compound, C11H14N2O2, was prepared by the reaction of acetohydrazide and 1-(4-methoxyphenyl)ethanone. In the molecule, all bond lengths and angles are within normal ranges. In the crystal structure, adjacent molecules are linked into a centrosymmetric dimer by intermolecular N—H...O hydrogen bonding.

The title compound, C32H36Br2O2, was prepared by the reaction of 6-bromo-1-(2-bromo-6-hydroxynaphthalen-5-yl)naphthalen-2-ol and 1-iodohexane. The dihedral angle between the naphthalene ring planes is 63.8 (9)° The crystal structure may be stabilized by two very weak π–π interactions involving the six-membered rings, with centroid–centroid distances of 4.012 (4) and 4.010 (4) Å. The crystal studied was an inversion twin.