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In the crystal structure of the title compound, NH(4) (+)·PF(6) (-)·C(12)H(24)O(6), the cation is situated in the 18-crown-6 ring, forming a supra-molecular rotator-stator-like structure held by N-H⋯O hydrogen bonds. The six O atoms of the crown ether lie approximately in a plane [mean deviation 0.2129 (3) Å]; the N atom is displaced by 0.864 (3)Å from the centroid of the 18-crown-6 ring. The slightly distorted tetra-hedral cations further inter-act with the slightly distorted octa-hedral anions via inter-molecular N-H⋯F hydrogen bonds.

In the crystal structure of the title compound, C(8)H(12)N(+)·C(3)H(3)O(4) (-), the hydrogen malonate anions are linked into infinite chains parallel to the b axis by inter-molecular O-H⋯O hydrogen bonds of the type COO(-)⋯HO(2)C in a head-to-tail fashion. The 4-ethyl-anilinium cations link adjacent anion chains by inter-molecular N-H⋯O hydrogen bonds into a two-dimensional network parallel to the b and c axes.

In the crystal structure of the title molecular salt, C(8)H(12)N(+)·C(7)H(7)O(3)S(-), the 4-ethyl-anilinium cations and 4-methyl-benzene-sulfonate anions are linked into chains parallel to the b axis by inter-molecular N-H⋯O hydrogen bonds.