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The title Schiff base, C20H14ClNO, obtained from the reaction of 4-chloro aniline with benzil, has an approximate T shape. The dihedral angle between the phenyl rings of the benzil unit is 74.14 (15)°. The extended structure features C—H...O hydrogen bonds.

In the title compound, C24H32BrN3O2, the six-membered cyclohexane ring adopts a chair conformation and the isoxasolidine ring adopts a twisted conformation. The molecule has five chiral centres and the absolute configuration has been determined in this analysis. The molecular structure is stabilized by weak intramolecular C—H...O and C—H...N contacts. In the crystal, molecules are linked by N—H...N and C—H...O hydrogen bonds, forming undulating sheets parallel to the bc plane.

The title compound, C15H18ClN5O2, crystallizes with two independent molecules (A and B) in the asymmetric unit. In both molecules, the isoxazolidine rings have an envelope conformation with the O atoms at the flap positions. Each molecule has three stereogenic centres with configurations 2(S), 3(S) and 4(R), confirmed by resonant scattering. Their conformations are significantly different, for example in molecule A the phenyl ring is inclined to the triazole ring by 32.5 (2)°, while in molecule B the corresponding dihedral angle is 10.7 (2)°. In the crystal, the A and B molecules are linked via an N—H...O and a C—H...O hydrogen bond. These units are linked by C—H...O and C—H...N hydrogen bonds, forming slabs parallel to the ab plane. There are C—H...π interactions present within the slabs.

There are two crystallographically independent cations and two anions in the asymmetric unit of the title compound, C4H5NO2+·NO3−. In the crystal, the 1-carboxypropanaminium cations and nitrate anions are linked to each other through strong N—H...O and O—H...O hydrogen bonds, forming a three-dimensional complex network. C—H...O interactions also occur.

In the title complex, [Ni(C5H9NO2)2(H2O)2], the NiII atom, located on a centre of inversion, is trans-coordinated by two O atoms and two N atoms from d-bidentate valine and l-bidentate valine ligands and two water O atoms in an octahedral geometry. In the crystal, the discrete mononuclear units are linked into a three-dimensional network via O—H...O and N—H...O hydrogen bonds. C—H...O interactions are also observed.

The asymmetric unit of the title compound, (C7H7N2S)2[ZnCl4], contains a network of 2-aminobenzothiazolium cations and tetrahedral [ZnCl4]2− anions. The crystal packing is influenced by cation-to-anion N—H...Cl and C—H...Cl hydrogen bonds. The [ZnCl4]2− anions have a distorded tetrahedral geometry. Intermolecular π–π stacking interactions are present between neighboring benzene rings, thiazole and benzene rings and neighboring thiazole rings [centroid–centroid distances = 3.711 (2), 3.554 (1), 3.536 (2) and 3.572 (1) Å].

In the title compound, [ZnCl(HPO4)](C5H8NO), polymeric inorganic layers constructed from ZnO3Cl and PO4 tetrahedra are linked by O atoms: O—H...O hydrogen bonds occur within the layers. The organic cations occupy the interlayer regions and interact with the layers by way of N—H...O, N—H...Cl, and C—H...Cl hydrogen bonds.

The asymmetric unit of the title compound, (C11H18N2)2[CdCl6]·2H2O, consists of one 1-benzylpiperazine-1,4-diium dication, one water molecule and one-half of a [CdCl6]4− anion, located on an inversion centre. The crystal packing is governed by an extensive three-dimensional network of intermolecular O—H...Cl, C—H...Cl, N—H...O and N—H...Cl hydrogen bonds, two of them bifurcated.

In the title compound, C11H18N22+·2ClO4−·H2O, one perchlorate anion is disordered over two orientations in a 0.66 (3):0.34 (3) ratio. Intermolecular O—H...O, N—H...O and C—H...O hydrogen bonds link the cations, anions and water molecules into ribbons extending along [100].

The title compound, (C8H12NO)(C16H18NO2)[ZnCl4]·H2O, was obtained as a by-product of the Zn2+ and HCl catalyzed condensation of (2-methoxyphenyl)methanamine in water. Both cations feature an intramolecular N—H...O hydrogen bond. In the crystal, the components are linked by an extensive three-dimensional network of N—H...O, O—H...Cl and N—H...Cl hydrogen bonds (three of them bifurcated). Weak C—H...O interactions also occur.

In the title compound, C4H8N3O4P+·H2PO3−, the cytosine molecule is monoprotonated and the phosphoric acid is in the monoionized state. Strong hydrogen bonds, dominated by N—H...O interactions, are responsible for cohesion between the organic and inorganic layers and maintain the stability of this structure.

The title compound, C6H10N22+·2Cl−, contains a network of 4-(ammoniomethyl)pyridinium cations and chloride anions which are interconnected by N—H...Cl hydrogen bonds. The crystal packing is also influenced by intermolecular π–π stacking interactions between identical antiparallel organic cations with a face-to-face distance of ca 3.52 Å.

The title compound, C12H19N2+·Cl−·H2O, contains a network of 4-(2,3-dimethylphenyl)piperazin-1-ium cations, water molecules and chloride anions. The crystal packing is influenced by O—H...Cl, N—H...Cl, N—H...O, C—H...O and C—H...Cl hydrogen bonds, resulting in structure with an open-framework architecture.

In the crystal structure of the title compound, (C10H15ClN2)[ZnCl4]·H2O, the Zn atom is coordinated by four Cl atoms in a tetrahedral geometry. The water molecules and the 1-(4-chlorophenyl)piperazine-1,4-diium cations interact with the [ZnCl4]2− anions through O—H...Cl, N—H...Cl, N—H...O and C—H...Cl hydrogen bonds (five simple and one bifurcated). Intermolecular π–π stacking interactions are present between adjacent aromatic rings of 1-(4-chlorophenyl)piperazine-1,4-diium cations (the centroid–centroid distance is 3.453 Å).

The title compound, C18H33NO3, was prepared according to a highly diastereoselective hydrogenation procedure from 3,5,7-triallyl-1-azaadamantane-4,6,10-trione. The crystal structure of the title compound contains two crystallographically independent molecules (Z′ = 2), which are linked by intermolecular hydrogen bonding into chains. In contrast to the azaadamantanones, the azaadamantanetriol core of the title compound does not show any particular C—C bond elongation.