catena-Poly­[[[di­aqua­cadmium(II)]-di-μ-thio­cyanato] bis(2-amino-4,6-di­methyl­pyrimidine)]

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.

Tetraaquadithiocyanatonickel(II) tetrakis(2-amino-4,6-dimethylpyrimidine) dihydrate

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.

Pyrimethaminium sulfosalicylate monohydrate

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.

Hydrogen-bonding patterns in bis­(trimethoprim) dipicolinate penta­hydrate

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.

Hydrogen-bonding patterns in trimethoprim tetrafluoroborate

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.