2,6-Diethyl-anilinium dihydrogen phosphate-phospho-ric acid (1/1).

In the crystal structure of the title salt, C(10)H(16)N(+)·H(2)PO(4) (-)·H(3)PO(4), the H(2)PO(4) (-) and H(3)PO(4) 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 supra-molecular two-dimensional framework extending parallel to (001). The organic cations cross-link the anionic layers by way of multiple N-H⋯O inter-actions, leading to a cohesive network.

2-Methyl-anilinium dihydrogen phosphate-phospho-ric acid (1/1).

In the title compound, C(7)H(10)N(+)·H(2)PO(4) (-)·H(3)PO(4), there is a clear distinction between the P-O/P=O and P-OH bond lengths. In the crystal, the H(2)PO(4) (-) anions and H(3)PO(4) mol-ecules are linked by O-H⋯O hydrogen bonds, leading to layers propagating in the bc plane. The organic cations are located between these layers and inter-act with them by way of N-H⋯O hydrogen bonds.

3-Chloro-2-methyl-anilinium dihydrogenphosphate.

The structure of the title compound, C(7)H(9)ClN(+)·H(2)PO(4) (-), contains inorganic layers built by (H(2)PO(4))(-) anions and which are parallel to the ab planes around z = . 3-Chloro-2-methyl-anilinium cations are anchored between the inorganic layers through N-H⋯O hydrogen bonds. Electrostatic and van der Waals inter-actions, as well as hydrogen bonds, maintain the structural cohesion.