In the crystal structure of the title compound, C6H10N3O+·C7H4ClO2−, the pyrimidine N atom of the cation is hydrogen-bonded to the 4-chloro­benzoate anion through a pair of N—H⋯Ocarbox­yl hydrogen bonds, forming an (8) ring motif which is linked through centrosymmetric (8) ring motifs, forming a pseudo­tetra­meric DDAA array.

In the title molecular salt, C6H10N3O+·C2F3O2−, the pyrimidinium cation is essentially planar, with a maximum deviation of 0.042 (3) Å for all non-H atoms. In the crystal, the cations and anions are linkedviaN—H...O hydrogen bonds, forming a centrosymmetric 2 + 2 aggregate withR22(8) andR42(8) ring motifs. These motifs are further linked through a pair of C—H...O hydrogen bonds into a supramolecular tape along the [101] direction.

The title Schiff base compound displays an E configuration with respect to the C=N double bond. The benzene rings form a dihedral angle of 58.06 (9)°. In the crystal, the mol­ecules are linked by N—H⋯O and C—H⋯O hydrogen bonds into chains, which are further connected into a three-dimensional network by C—H⋯π inter­actions.

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In the title molecular salt, C 6 H 10 N 3 O + ÁC 7 H 5 O 3 À , the cation is protonated at the N atom lying between the amine and methyl substituents and the dihedral angle between the carboxyl group and its attached ring in the anion is 4.0 (2). The anion features an intramolecular O-HÁ Á ÁO hydrogen bond, which closes an S(6) ring. The cation and anion are linked by two N-HÁ Á ÁO hydrogen bonds [R 2 2 (8) motif] to generate an ion pair in which the dihedral angle between the aromatic rings is 8.34 (9) . Crystal symmetry relates two ion pairs bridged by further N-HÁ Á ÁO hydrogen bonds into a tetrameric DDAA array. The tetramers are linked by pairs of C-HÁ Á ÁO hydrogen bonds to generate [100] chains. Hirshfeld surface and fingerprint plot analyses are presented.