2-Chloro­benzene-1,4-diaminium bis­(dihydrogenphosphate)

The asymmetric unit of the title salt, C₆H₉ClN₂²⁺·2H₂PO₄⁻, contains two dihydrogenphosphate anions and one 2-chloro­benzene-1,4-diaminium dication. The H₂PO₄⁻ anions are inter­connected through strong O—H...O hydrogen bonds to form two-dimensional infinite layers parallel to (001). The organic entities are anchored to the inorganic layers through N—H...O hydrogen bonds, and through weak C—Cl...O halogen bonds [3.159 (2) Å, 140.48 (7)°]. No π–π stacking inter­actions between neighboring aromatic rings or C—H...π inter­actions towards them are observed. Minor disorder is observed for the Cl atom and one hy­droxy group [minor-component occupancy = 3.29 (9)%].

Di­aqua­tetra­kis­(1H-imidazole-κN³)magnesium dichloride

In the title compound, [Mg(C₃H₃N₂)₄(H₂O)₂]Cl₂, the Mg^II cation lies on a crystallographic inversion centre and is coordinated by two water mol­ecules and four N-atom donors from monodentate imidazole ligands, giving a slightly distorted octa­hedral stereochemistry. In the crystal, water O—H...Cl and imidazole N—H...Cl hydrogen bonds give rise to a three-dimensional structure.

o-Phenyl­enediaminium chloride nitrate

In the title mol­ecular salt, C₆H₁₀N₂²⁺·NO₃⁻·Cl⁻, the complete cation is generated by a crystallographic mirror plane. The complete nitrate ion is also generated by reflection, with the N atom and one O atom lying on the mirror plane; the chloride ion also lies on the reflection plane. In the crystal, the components are linked by N—H...Cl and N—H...(N,O) hydrogen bonds, forming (001) layers with the benzene rings projecting into the inter­layer regions. The layers are linked by weak C—H...O hydrogen bonds, generating a three-dimensional network.

3-(Ammonio­methyl)­pyridinium bis­(perchlorate)

In the title molecular salt, C₆H₁₀N₂²⁺·2ClO₄⁻, the Cl—O bond lengths [anion 1: 1.369 (3)–1.415 (3); anion 2: 1.420 (2)–1.441 (2) Å] and the O—Cl—O angles [anion 1: 105.4 (2)–111.8 (4); anion 2: 107.8 (1)–110.3 (1)°] indicate a slight distortion of the perchlorate anions from regular tetra­hedral symmetry. In the crystal, the components are linked into columns along the a-axis direction via N—H...O and C—H...O hydrogen bonds, with stacks of the organic mol­ecules being surrounded by stacks of perchlorate anions.

3-Amino-5,6-dimethyl-1,2,4-triazin-2-ium nitrate

In the title compound, C₅H₉N₄⁺·NO₃⁻, the organic cations and the nitrate anions have both crystallographically imposed mirror symmetry and are linked via N—H...O hydrogen bonds, forming infinite chains running along the c-axis direction. The values of the N—O bond lengths [1.2256 (19)–1.2642 (18) Å] and O—N—O angles [118.39 (16)–121.64 (15)°] indicate that the nitrate anion exhibits a slightly distorted C_3h geometry. The N atom of the NH₂ group has sp² character.