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The article discusses the crystal structure of the metal-organic compound, Triaqua(µ-7-iodo-8-oxidoquinoline-5-sulfonato-k2N,O8)dioxidouranium(VI) dihydrate. It mentions that the compound's asymmetric unit has two uncoordinated water molecules, among others. The crystal structures of the copper complexes of the 8-hydroxy-7-iodoquinoline-5-sulfonic acid (HQS) are also examined.

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]

The title complex, {[Cd(NCS)2(H2O)2]·2C6H9N3} n, crystalizes in the triclinic space group P . The asymmetric unit contains one 2-amino-4,6-di­methyl­pyrimidine mol­ecule, a thio­cyanate ion, a water mol­ecule and a cadmium ion (site symmetry ). The cadmium ions are symmetrically doubly bridged by thio­cyanate ions, leading to a polymeric chain motif. The octahedral coordination geometry of cadmium is completed by a pair of inversion-related water mol­ecules. The 2-amino­pyrimidine mol­ecules are not coordinated to cadmium but are hydrogen-bonded to the coordinated water mol­ecules and thio­cyanate ions. There is also a pyrimidine–pyrimidine interaction via an N—H⋯N hydrogen bond. [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, C10H9N2+·C9H5INO4S-·2H2O, the 4,4'bipyridine molecule is protonated at one of the pyridine N atoms. These moieties self-assemble into a supramolecular chain along the a axis through N-H···N hydrogen bonds. The quinolinol OH group acts as a donor with respect to a sulfonate O atom [O-H···O(sulfonate)] and acts as an acceptor with respect to a C-H group of ferron [C-H···O(hydroxy)], forming a supramolecular chain along the b axis. These two types of supramolecular chains (one type made up of bipyridine motifs and the other made up of sulfoxine motifs) interact via π-π stacking, generating a three-dimensional framework. These chains are further crosslinked by C-H···O hydrogen bonds and O-H···O hydrogen bonds involving water molecules. [ABSTRACT FROM AUTHOR]

In the title compound, C9H13N8O2+·C7H3N2O6−, the aminopyrimidine molecule is protonated at one of the pyrimidine N atoms. The carboxylate group of the 3,5-dinitrobenzoate anion interacts with the protonated N atom and the 2-amino group in a nearly linear fashion through a pair of N—H...O hydrogen bonds, generating the typical R22(8) motif. Two inversion-related pyrimidine units are connected through a pair of N—H...N hydrogen bonds, forming a cyclic hydrogen-bonded R22(8) motif. In addition to the base pairing, one of the carboxylate O atoms bridges the 4′-amino and 6′-amino groups on both side of the pairing, forming a DADA array. The molecular conformation of the cation is stabilized by two intramolecular N—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 crystal structure of the title compound, C6H10N3+·C7H5O3-, the asymmetric unit contains four crystallographically independent 2-amino-4,6-dimethylpyrimidinium and salicylate ions (Z = 8). In each of these, one of the pyrimidine N atoms is protonated, and the carboxylate group of the salicylate ion interacts with the pyrimidine group through a pair of N—H…O hydrogen bonds, forming an R2²(8) motif. The pyrimidine cations also form base pairs via a pair of N—H…N hydrogen bonds (involving the amino group and the unprotonated ring N atom), forming another R2²(8) motif. Three such R2²(8) motifs, fused together, constitute a closed cyclic aggregate, and the linking of these aggregates, arranged in consecutive layers, can be analysed in terms of off-face stacking interactions. [ABSTRACT FROM AUTHOR]

The title compound, 2,4-diamino-5-(4-chloro­phen­yl)-6-ethyl­pyrimidine-1,3-diium dinitrate, C12H15ClN42+·2NO3−, contains two crystallographically independent pyrimethamine (PMN) mol­ecules, which differ in the relative orientations of the pyrimidine and benzene rings and of the eth­yl substitutents. In both pyrimethamine mol­ecules, all the pyrimidine N atoms are protonated, unlike most related compounds, in which only one pyrimidine N atom is protonated. The two pyrimethamine moieties are bridged by a variety of N—H⋯O(nitrate) inter­actions, including some three-centre hydrogen bonds. [ABSTRACT FROM AUTHOR]