2-Amino-3-nitro­pyridinium perrhenate

In the title mol­ecular salt, (C5H6N3O2)[ReO4], the cations and tetrahedral anions are linked by trifurcated N—H⋯(O,O,O) and bifurcated N—H⋯(O,O) hydrogen bonds, as well as weak C—H⋯O inter­actions. This results in alternating corrugated inorganic and organic layers in the crystal

2-Amino-3-nitro­pyridinium perchlorate

The title compound, C5H6N3O2 +·ClO4 −, is comprised of discrete perchlorate anions and 2-amino-3-nitro­pyridinium cations. The anion has a typical tetra­hedral geometry while the cation presents a nearly planar [maximum deviation = 0.007 (8) Å] pyridinium ring. Undulating [C5H6N3O2 +]n chains extending along the c-axis direction are linked via N—H⋯O hydrogen bonds. The cations are further connected to the anions by N—H⋯O hydrogen bonds and weak C—H⋯O inter­actions, leading to the formation of a three-dimensional network

Bis(2-amino-3-nitro­pyridinium) dihydrogen­diphosphate

The structure of the title compound, 2C5H6N3O2 +·H2P2O7 2−, contains infinite (H2P2O7 2−)n layers stacked perpendicular to the a axis. The 2-amino-3-nitro­pyridinium cations are arranged in pairs and are anchored between these layers, linking them by N—H⋯O and C—H⋯O hydrogen-bonding and electrostatic inter­actions between anionic and cationic species to form a three-dimensional network

2-Amino­pyrimidinium hydrogen sulfate

In the crystal structure of the title compound, C4H6N3 +·HSO4 −, hydrogen sulfate anions self-assemble through O—H⋯O hydrogen bonds, forming chains along the b axis, while the cations form centrosymmetric pairs via N—H⋯N hydrogen bonds. The 2-amino­pyrimidinium pairs are linked to the sulfate anions via N—H⋯O hydrogen bonds, forming a two-dimensional network parallel to (10). In addition, weak inter­molecular C—H⋯O contacts generate a three-dimensional network

2,6-Diethyl­anilinium dihydrogen phosphate–phospho­ric acid (1/1)

In the crystal structure of the title salt, C10H16N+·H2PO4 −·H3PO4, the H2PO4 − and H3PO4 components are connected into infinite chains extending along the b-axis direction by way of O—H⋯O links. These chains are also linked through O—H⋯O hydrogen bonds thus building up a supra­molecular two-dimensional framework extending parallel to (001). The organic cations cross-link the anionic layers by way of multiple N—H⋯O inter­actions, leading to a cohesive network

Tris(1,10-phenanthroline)cobalt(II) bis­(perrhenate) monohydrate

In the title compound, [Co(C12H8N2)3][ReO4]2·H2O, the CoII atom is coordinated by three 1,10-phenanthroline ligands in a distorted octa­hedral arrangement. In the crystal, the components are linked by O—H⋯O, C—H⋯O and aromatic π–π stacking [shortest centroid–centroid separation = 3.659 (5) Å] inter­actions

Tetraquinolinium ditelluro(VI)octavanadate(V) octahydrate

In the title compound, (C9H8N)4[Te2V8O28]·8H2O, the complete heteropolyanion is generated by a crystallographic inversion centre. One of the two quniolinium ions forms an N—H...Op (p = polyoxidometallate) hydrogen bond and the other an N—H...Ow (w = water) hydrogen bond. The water molecules further link the components by O—H...Op and O—H...Ow hydrogen bonds. A number of C—H...O interactions and aromatic π–π stacking interactions [shortest centroid–centroid separation = 3.541 (7) Å] are also observed. Together, these generate a three-dimensional network

Piperazine-1,4-diium bis(hexahydroxidoheptaoxidohexaborato-κ3O,O′,O′′)cobaltate(II) hexahydrate

In the title hydrate, (C4H12N2)[Co{B6O7(OH)6}2]·6H2O, both the dication and dianion are generated by crystallographic inversion symmetry. The Co2+ ion in the dianion adopts a fairly regular CoO6 octahedral coordination geometry arising from the two O,O′,O′′-tridentate ligands. In the crystal, the dianions and water molecules are linked by O—H...O hydrogen bonds, generating a framework with large [100] channels, which are occupied by the organic dications. N—H...O and C—H...O hydrogen bonds consolidate the structure