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In the title compound, C8H9N+·H2PO4−, both the cation and anion have crystallographically imposed mirror symmetry (all atoms apart from one O atom lie on the mirror plane). In the crystal, anions and cations are linked by O—H...O and π–π stacking interactions [centroid–centroid distance = 3.4574 (6) Å], forming chains parallel to the b axis. Adjacent chains are further connected by N—H...O hydrogen bonds into a two-dimensional network.

In the title compound, (C5H7N2)2[ZnCl4], the pyridine N atoms are protonated and the [ZnCl4]2− anions adopt a slightly distorted tetrahedral configuration. In the crystal, weak N—H...Cl hydrogen bonds link the molecules into layers, while weak π–π interactions [centroid–centroid distance = 4.2758 (18) Å] also help to stabilize the packing.

In the title compound, [Zn(C11H8N5O)(N3)]n, the Zn atom is hexacoordinated by five N atoms and one O atom in a distorted octahedral geometry. The chelating 5-(8-quinolyloxymethyl)tetrazolate ligands are approximately planar, with a dihedral angle of 3.6 (2)° between the quinoline and tetrazole planes. Adjacent Zn atoms are linked by two bridging azide ligands across a centre of inversion, and further coordination by one N atom of an adjacent tetrazole unit forms two-dimensional frameworks in (100). C—H...N interactions exist between ligands in neighbouring layers.