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In the crystal structure of the title compound, 2C6H9N3 C8H6O4, terephthalic acid has a crystallographic inversion centre and the dimethylpyrimidine molecule shows approximate non-crystallographic mirror and twofold rotation symmetry. The inversion-related pyrimidine molecules form a base pair [R2 2(8) ring motif] via a pair of NH⋯N hydrogen bonds. The carboxyl groups of terephthalic acid link the base pairs via OH⋯N and NH⋯O hydrogen bonds [R2 2(8) motif] to generate a supramolecular ribbon. [ABSTRACT FROM AUTHOR]

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 crystal structure of the title compound, 2,4-diamino-5-(4-chloro­phen­yl)-6-ethyl­pyrimidin-1-ium 3-carb­oxy-4-hydroxy­benzene­sulfonate monohydrate, C12H14ClN4+·C7H5O6S−·H2O, the asymmetric unit contains two crystallographically independent protonated pyrimethamine (PMN) mol­ecules, a pair of sulfosalicylate anions and two water mol­ecules. Both the PMN molecules are protonated at one of the pyrimidine N atoms. The component species inter­act through numerous inter­molecular N—H⋯O, N—H⋯N and O—H⋯O hydrogen bonds and C—H⋯O inter­actions. [ABSTRACT FROM AUTHOR]

In the title complex, [Ni(NCS)2(H2O)4]·4C6H9N3·2H2O, the nickel(II) ion occupies an inversion centre and is octahedrally coordinated by two N-bonded thio­cyanate ions and four water mol­ecules. The two distinct 2-amino-4,6-di­methyl­pyrimidine mol­ecules adopt distinct base-pairing dimerization patterns via different pairs of N—H⋯N bonds. They are also hydrogen bonded to the coordinated and uncoordinated water mol­ecules and thio­cyanate ions through O—H⋯O, O—H⋯S(thio­cyanate) and N—H⋯N(thio­cyanate) hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, 2,4-di­amino-5-(3,4,5-tri­methoxy­benzyl)­pyrimidinium hydrogen malonate, C14H19N4O3+·C3H3O4−, the trimethoprim mol­ecule is protonated at one of the pyrimidine N atoms. The carboxyl­ate group of the hydrogen malonate ion accepts a pair of N—H⋯O hydrogen bonds from an adjacent trimethoprim mol­ecule, which is similar to the carboxyl­ate–trimethoprim cation interaction present in the complex of di­hydro­folate reductase with trimethoprim. An O atom of the carboxyl group forms an intramolecular O—H⋯O hydrogen bond with the carboxyl­ate group, leading to a folded conformation for the hydrogen malonate ion. Each hydrogen malonate ion bridges two di­amino­pyrimidine cations, via N—H⋯O and C—H⋯N hydrogen bonds, leading to a supramolecular ribbon made up of alternating cations and anions. Two such inversion-related ribbons are cross-linked by (amino)N—H⋯O(methoxy) hydrogen bonds, (pyrimidine)C—H⋯O(methoxy) hydrogen bonds and π–π stacking involving the benzene planes. [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, C10H12O3N3S+·Cl−, 4-amino- N-(5-methyl-3-isoxazolyl)benzenesulfonamide is protonated on the amine N atom which is connected to the benzene ring. The geometry around the S atom is considerably distorted from ideal tetrahedral geometry. The crystal packing is stabilized by intermolecular N—H...N, N—H...Cl, N—H...O and C—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title cocrystal, C9H9N5·C6H8O2, the asymmetric unit contains one 2,4-diamino-6-phenyl-1,3,5-triazine molecule and a sorbic acid molecule. The triazine molecules are base-paired [with a graph set of R22(8)] on either side via N—H...N hydrogen bonds, forming a supramolecular ribbon along the c axis. Each triazine molecule interacts with the carboxyl group of a sorbic acid molecule via N—H...O and O—H...N hydrogen bonds, generating R22(8) motifs. The supramolecular ribbons are interlinked by N—H...O hydrogen bonds involving the 2-amino group of the triazine molecules and the carboxyl O atom of the sorbic acid molecule. [ABSTRACT FROM AUTHOR]

In the title compound, C4H6N4O·C7H5NO4, there are two types of base-pairing motifs, one involving a pair of N—H...N hydrogen bonds and the other involving a pair of N—H...O hydrogen bonds. These paired molecules are further linked by N—H...O hydrogen bonds to generate DADA and DDAA ( D = donor and A = acceptor) arrays leading to a supramolecular sheet. [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]

In 2,4-diamino-5-( p-chlorophenyl)-6-ethylpyrimidinium hydrogen adipate, C12H14ClN4+·C6H9O4−, the protonated pyrimethamine cation interacts with the carboxylate group of the adipate ion through N—H...O hydrogen bonds, forming a cyclic hydrogen-bonded R22(8) motif. The carboxyl and carboxylate groups of the adipate ions are linked through O—H...O hydrogen bonds in a head-to-tail fashion, forming a chain. Anions and cations are further connected by an extensive network of N—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound [systematic name: 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimidin-1-ium 3,5-dinitrobenzoate], C12H14ClN4+·C7H3N2O6−, the pyrimethamine molecule is protonated at one of the pyrimidine N atoms. The carboxylate group of the 3,5-dinitrobenzoate anion forms double hydrogen bonds of type N—H...O, resulting in a fork-like interaction with the protonated diaminopyrimidine rings [graph-set notation R22(8)]. This motif self-assembles through a DDAA array of quadruple hydrogen bonds. The crystal structure is also stabilized by C—H...O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound [systematic name: 2,4-diamino-5-(4-chlorophenyl)-6-ethylpyrimdinium tetrafluoroborate], C12H14ClN4+·BF4−, is isomorphous with pyrimethamine perchlorate. The pyrimethamine (PMN) molecule is protonated at one of the pyrimidine N atoms. The protonated N atom and 2-amino group of the PMN cation interact with the tetrafluoroborate anion through a pair of N—H...F hydrogen bonds [graph set R22(8)]. The inversion-related PMN cations are linked through a pair of N—H...N hydrogen bonds. In addition to the base pairing, the F atoms bridge the 2-amino and 4-amino groups on either side of the paired bases, resulting in a complementary DADA array. [ABSTRACT FROM AUTHOR]

In the title compound [systematic name: 2,4-diamino-5-(3,4,5-trimethoxy­benz­yl)pyrimidinium tetrafluoroborate], C14H19N4O3+·BF4−, the trimethoprim (TMP) mol­ecule is protonated at one of the pyrimidine N atoms. The protonated N atom and 2-amine group of the TMP cation inter­act with the tetrafluoroborate anion through a pair of N—H⋯F hydrogen bonds [graph set R22(8)]. The inversion-related TMP cations are linked through a pair of N—H⋯N hydrogen bonds. The 2-amine group of one TMP cation and the 4-amine group of another cation are bridged by a meth­oxy O atom, via N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C6H9N3·2C9H8O2, an amino­pyrimidine–cinnamic acid 1:2 cocrystal, the 2-amino-4,6-dimethyl­pyrimidine mol­ecule forms two eight-membered hydrogen-bonded rings [ R22(8) motif] with the carboxylic acid groups from two independent cinnamic acid mol­ecules via N—H⋯O and O—H⋯N hydrogen bonds. The cinnamic acid mol­ecules are linked by C—H⋯O hydrogen bonds to form chains along two axes. [ABSTRACT FROM AUTHOR]

The title compound, [Sr(C9H5INO4S2)2(H2O)2]·H2O, is isomorphous with the corresponding calcium complex of ferron (8-hydroxy-7-iodo­quinoline-5-sulfonic acid). The asymmetric unit consists of one SrII ion, two organic ligands, two coordinated water mol­ecules and one uncoordinated water mol­ecule. The SrII ion has a pentagonal–bipyramidal coordination geometry made up of O atoms of three different sulfonate groups, deprotonated quinolinol O atoms of two different oxine rings and two water mol­ecules. In the ligands of type I, two O atoms of the sulfonate group are involved in coordination, whereas in type II ligands, only one O atom is involved. Ligands of type I are stacked on top of one another, each pair of adjacent members of the stack being related by an inversion centre. Ligands of type II are also stacked in a similar manner. These molecular stacks are cross-linked by Sr—O(sulfonate) and Sr—O(quinolinol) bonds, leading to an extended framework. This architecture is further stabilized by a number of O—H⋯O and N—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

In the title compound, C6H9N3·C7H6O3, the 2-amino-4,6-dimethyl­pyrimidine and 4-hydroxy­benzoic acid mol­ecules link together via N—H⋯O and O—H⋯N hydrogen bonds to form an eight-membered R22(8) ring. Further hydrogen bonds and C—H⋯O inter­actions result in the formation of a three-dimensional network. [ABSTRACT FROM AUTHOR]

In the title cocrystal, C6H9N3O2·C7H7NO2, the 2-amino-4,6-dimethoxy­pyrimidine mol­ecule inter­acts with the carboxyl group of the 4-amino­benzoic acid mol­ecule through N—H⋯O and O—H⋯N hydrogen bonds, forming a cyclic hydrogen-bonded motif [ R22(8)]. This motif further self-organizes through N—H⋯O hydrogen bonds to generate an array of six hydrogen bonds with the rings having the graph-set notation R23(6), R22(8), R42(8), R22(8) and R23(6). The 4-amino­benzoic acid mol­ecules self-assemble via N—H⋯O hydrogen bonds to form a supra­molecular chain along the c axis. [ABSTRACT FROM AUTHOR]