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In the title compound, C(8)H(9)N(+)·H(2)PO(4) (-), 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 inter-actions [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, (C(5)H(7)N(2))(2)[ZnCl(4)], the pyridine N atoms are protonated and the [ZnCl(4)](2-) anions adopt a slightly distorted tetra-hedral configuration. In the crystal, weak N-H⋯Cl hydrogen bonds link the mol-ecules into layers, while weak π-π inter-actions [centroid-centroid distance = 4.2758 (18) Å] also help to stabilize the packing.

In the title compound, [Zn(C(11)H(8)N(5)O)(N(3))](n), the Zn atom is hexa-coordinated by five N atoms and one O atom in a distorted octa-hedral geometry. The chelating 5-(8-quinolyloxymeth-yl)tetra-zolate ligands are approximately planar, with a dihedral angle of 3.6 (2)° between the quinoline and tetra-zole 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 tetra-zole unit forms two-dimensional frameworks in (100). C-H⋯N inter-actions exist between ligands in neighbouring layers.