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In the title compound, 2C14H19N4O3+·C7H3NO42−·5H2O, the asymmetric unit contains two trimethoprim cations ( A and B), a dipicolinate anion and five water mol­ecules. One of the picolinate carboxyl­ate groups inter­acts with cation A via a pair of N—H⋯O hydrogen bonds, forming a ring motif (8). A loop of O—H⋯O hydrogen bonds is formed between four water mol­ecules and the two carboxyl­ate groups to form a supramolecular chain along the a axis. Mol­ecules A and B constitute a base pair via N—H⋯N hydrogen bonds, and these base pairs are cross-linked by N—H⋯O and C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title structure, C6H10N3+·C6H2N3O7-, the asymmetric unit consists of a 2-amino-4,6-dimethylpyrimidinium cation and a picrate (2,4,6-trinitrophenolate) anion. In the crystal structure, inversion-symmetry-related cations are paired via N—H…N hydrogen bonds, whereas inversion-related anions are paired via weak C—H…O hydrogen bonds. The cations and anions further interact with each other through N—H…O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C4H7N4O2+·SO42−·H2O, the asymmetric unit contains two amino­pyrimidinium cations, a sulfate anion and a water mol­ecule. These species are connected by N—H⋯O and O—H⋯O hydrogen bonds, resulting in a three-dimensional network. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, C6H10N3+·Br−·C6H9N3·H2O, the asymmetric unit contains a 2-amino-4,6-di­methyl­pyrimidinium cation, a Br− anion, a neutral 2-amino-4,6-di­methyl­pyrimidine mol­ecule and a water mol­ecule. Each neutral base molecule is paired with another inversion-related molecule through N—H⋯N hydrogen bonds to form dimers, and these are linked to one another through water-mediated hydrogen bonds, generating a supramolecular ribbon. The cations also pair with one another through N—H⋯N hydrogen bonds. The cation pairs are stacked on top of the neutral pairs. The Br− anion also takes part in hydrogen bonding (N/O—H⋯Br). [ABSTRACT FROM AUTHOR]

In the title compound, C12H14ClN4+·C6H4NO2−·H2O, the pyrimethamine molecule is protonated at one of the pyrimidine N atoms. The protonated N atom and 2-amino group of the cation interact with an adjacent nicotinate anion through a pair of N—H...O hydrogen bonds [graph set R22(8)]. The cation, anion and water molecule form a hydrogen-bonded ring motif with graph-set notation R42(8). The crystal structure is further stabilized by N—H...O and O—H...O hydrogen bonds and π–π interactions [centroid–centroid distance = 3.637 (6) Å]. [ABSTRACT FROM AUTHOR]