Houda Marouani

4-Methyl-benzyl-ammonium nitrate.

In the title salt, C8H12N+·NO3 −, the N atom of the 4-methylbenzylammonium cation is displaced by 1.366 (2) Å from the mean plane of the other atoms. In the crystal, the cations are connected to the anions by N—H⋯O and N—H⋯(O,O) hydrogen bonds, generating a layered network parallel to (100). A weak C—H⋯O interaction also occurs.

Tetra­kis(3,5-xylidinium) dihydrogen cyclo­hexa­phosphate dihydrate

In the title compound, 4C8H12N+·H2P6O18 4−·2H2O, the complete cyclohexaphosphate anion is generated by inversion symmetry. Crystal cohesion and stability are supported by electrostatic interactions which, together with N—H⋯O and O—H⋯O hydrogen bonds, build up a three-dimensional network.

2-Amino­pyrimidinium dihydrogen phosphate monohydrate

In the title compound, C4H6N3 +·H2O4P−·H2O, the pyrimidinium ring is essentially planar, with an r.m.s. deviation of 0.0016 Å. In the structure, pairs of symmetry-related anions are connected into centrosymmetric clusters via strong O—H⋯O hydrogen bonds forming six-membered rings with an R 2 2(6) motif. These clusters are interconnected via water molecules through OW—H⋯O hydrogen bonds, building an infinite layer parallel to the ab plane. Moreover, infinite chains of 2-aminopyrimidinium cations spread along the a-axis direction. These chains are connected to the inorganic layer through N—H⋯O, C—H⋯O and C—H⋯N hydrogen bonds, which, together with electrostatic and van der Waals interactions, contribute to the cohesion and stability of the network in the crystal structure.

Bis(oxonium) tetra­kis(o-toluidinium) cyclo­hexa­phosphate

In the title compound, 4C7H10N+·2H3O+·P6O18 6−, the complete cyclohexaphosphate anion is generated by crystallographic inversion symmetry. In the crystal, the H3O+ ions and the [P6O18]6− anions are linked by O—H⋯O hydrogen bonds, generating infinite layers lying parallel to the ab plane at z = 1/2. These layers are interconnected by the organic cations, which establish N—H⋯O hydrogen bonds with the [P6O18]6− anions.

2,3-Xylidinium nitrate.

In the crystal structure of the title compound, C8H12N+·NO3 −, the 2,3-xylidinium (2,3-dimethylanilinium) cations are connected to the nitrate anions through bifurcated N—H⋯(O,O) and weak C—H⋯O hydrogen bonds, generating corrugated layers parallel to (001) at z = 0.25 and 0.75. These layers are connected via C—H⋯O interactions, giving rise to a three-dimensional network.

m-Xylylenediaminium dinitrate

The asymmetric unit of the title salt, C8H14N2 2+·2NO3 −, contains two independent dications and four independent nitrate anions. The crystal structure consists of discrete nitrate ions, three of which stack in layers parallel to (001) at z = 0 and 0.5. These layers are connected via m-xylylenediaminium dications. The fourth anion is sandwiched by the two independent organic cations in the asymmetric unit. In the crystal, the ions are connected by a large number of bifurcated and non-bifurcated N—H⋯O(O) hydrogen bonds, forming sheets parallel to (100). These sheets are connected by C—H⋯O hydrogen bonds, forming a three-dimensional network.

Bis(1-methyl-piperazine-1,4-diium) di-μ-bromido-bis-[tetra-bromido-bismuthate(III)] dihydrate.

In the title hydrated salt, (C5H14N2)2[Bi2Br10]·2H2O, the complete [Bi2Br10]4− bioctahedron is generated by crystallographic inversion symmetry. The diprotonated piperazine ring adopts a chair conformation, with the methyl group occupying an equatorial position. In the crystal, the tetraanions and water molecules are linked by O—H⋯Br and O—H⋯(Br,Br) hydrogen bonds to generate [100] chains. The chains are crosslinked by N—H⋯Br, N—H⋯O and C—H⋯Br hydrogen bonds originating from the piperazinediium dications, thereby forming a three-dimensional network.

1,1,4,7,7-Penta­methyl­diethylenetri­ammonium trinitrate

In the title compound, C9H26N3 3+·3NO3 −, the triprotonated 1,1,4,7,7-pentamethyldiethylenetriamine molecules are linked to the nitrate anions by multiple bifurcated N—H⋯(O,O) and weak C—H⋯O hydrogen bonds. The organic cation is characterized by N—C—C—N torsion angles of −176.2 (2) and 176.6 (2)°.

trans-2,5-Di­methyl­piperazine-1,4-diium dinitrate

In the structure of the title salt, C6H16N2 2+·2NO3 −, the cations are connected to the anions through bifurcated N—H⋯(O,O) and weak C—H⋯O hydrogen bonds, generating corrugated layers parallel to the (100) plane. The organic cation is centrosymmetric and the diprotonated piperazine ring adopts a chair conformation, with the methyl groups occupying equatorial positions.

1-Phenyl­piperazine-1,4-diium bis­(hydrogen sulfate)

In the title compound, C10H16N2 2+·2HSO4 −, the S atoms adopt slightly distorted tetrahedral geometry and the diprotonated piperazine ring adopts a chair conformation. In the crystal, the 1-phenylpiperazine-1,4-diium cations are anchored between chains formed by the sulfate entities via intermolecular bifurcated N—H⋯(O,O) and weak C—H⋯O hydrogen bonds. These hydrogen bonds contribute to the cohesion and stability of the network of the crystal structure.