Bis(2-amino-4-methyl­pyrimidin-3-ium) trans-diaqua­bis­(pyrazine-2,3-di­car­boxylato)cobaltate(II) hexa­hydrate

In the crystal structure of the mononuclear title compound, (C5H8N3)2[Co(C6H2N2O4)2(H2O)2]·6H2O or (ampymH)2[Co(pyzdc)2(H2O)2]·6H2O (ampym = 2-amino-4-methyl pyrimidine, pyzdcH2 = pyrazine-2,3-dicarb­oxy­lic acid), the CoII ion is hexa­coordinated by two (pyzdc)2− groups in the equatorial plane and two water mol­ecules in axial positions, giving an N2CoO4 bound set. The (pyzdc)2− anion acts as a bidentate ligand through one carboxyl­ate group O atom and pyrazine ring N atom. There are diverse N—H⋯ O and O—H⋯O and O—H⋯N hydrogen-bonding inter­actions, which lead to the formation of a three-dimensional supra­molecular architecture. Off-set or slipped π–π stacking inter­actions are also observed between adjacent pyrimidine rings with face-to-face distances of 3.6337 (9) Å

Poly[(μ2-2-amino­pyrimidine-κ2 N 1:N 3)di-μ2-chlorido-mercury(II)]

The title compound, [HgCl2(C4H5N3)]n, features a two-dimensional network parallel to (001) that is based on an HgII atom octahedrally coordinated by four μ2-Cl atoms and two μ2-2-amino­pyrimidine (apym) ligands in trans positions, yielding a distorted HgCl4N2 octa­hedron. The coordination network can be described as an uninodal 4-connected net with the sql topology. The HgII ion lies on a site of -1 symmetry and the apym ligand lies on sites of m symmetry with the mirror plane perpendicular to the pyrimidine plane and passing through the NH2 group N atom. This polymeric structure is stabilized by N—H⋯Cl hydrogen bonds and columnar π–π stacking of pyrimidine rings, with a centroid–centroid distance of 3.832 (2) Å

Bis(2-amino-4-methyl­pyridinium) trans-diaqua­bis­(pyrazine-2,3-dicarboxyl­ato)cuprate(II) hexa­hydrate

The title compound, (C6H9N2)2[Cu(C6H2N2O4)2(H2O)2]·6H2O, consists of a mononuclear trans-[Cu(pzdc)2(H2O)2]2− dianion (pzdc is pyrazine-2,3-dicarboxyl­ate) and two [ampyH]+ cations (ampy is 2-amino-4-methyl­pyridine) with six water mol­ecules of solvation. The CuII atom is hexa­coordinated by two pzdc groups and two water mol­ecules. The coordinated water mol­ecules are in trans-diaxial positions and the pzdc dianion acts as a bidentate ligand through an O atom of the carboxyl­ate group and the N atom of the pyrazine ring. There are diverse hydrogen-bonding inter­actions, such as N—H⋯O and O—H⋯O contacts, which lead to the formation of a three-dimensional supra­molecular architecture

2-Amino­pyridinium bis­(pyridine-2,6-dicarboxyl­ato)ferrate(III)

In the title compound, (C5H7N2)[Fe(C7H3NO4)2] or [2-apyH][Fe(pydc)2], the asymmetric unit contains an [Fe(pydc)2]− (pydc is pyridine-2,6-dicarboxyl­ate) anion and a protonated 2-amino­pyridine cation ([2-apyH]+). The complex anion contains an FeIII atom within a distorted octahedral FeN2O4 coordination geometry. N—H⋯O and C—H⋯O hydrogen bonding, offset π–π stacking [centroid–centroid distance = 3.805 (13) Å] and C=O⋯π inter­actions [3.494 (14) Å] generate a three-dimensional network structure

Cyclo­hexyl­methyl­ammonium N,N′-dicyclo­hexyl-N,N′-dimethyl-N′′-(2,2,2-trifluoro­acet­yl)phospho­nic triamide)

In the salt, C7H16N+·C16H28F3N3O2P−, the P atom shows tetra­hedral coordination. Two ion pairs are linked by N—H⋯O hydrogen bonds across a center of inversion. The phosphoryl and carbonyl groups are staggered [O—P—N—C = 64.8 (3)°]

2-Amino­pyrimidinium hydrogen oxalate monohydrate

In the title hydrated salt, C4H6N3 +·C2HO4 −·H2O, inter­molecular N—H⋯O and O—H⋯O hydrogen bonding helps to stabilize the crystal structure

Bis(8-hy­droxy-2-methyl­quinolinium) bis­(pyridine-2,6-dicarboxyl­ato)­nickelate(II) methanol monosolvate monohydrate

In the title compound, (C10H10NO)2[Ni(C7H3NO4)2]·CH3OH·H2O, the coordination geometry of the NiII atom can be described as distorted octa­hedral. In the crystal, noncovalent inter­actions play an important role in the stabilization of the structure, involving O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen bonds and π–π stacking inter­actions between the pyridine rings of the pyridine-2,6-dicarboxyl­ate ligands [centroid–centroid distance = 3.7138 (15) Å] and between the 8-hy­droxy-2-methyl­quinolinium cations [centroid–centroid distances = 3.6737 (15), 3.4434 (14), 3.6743 (15), 3.7541 (16), 3.5020 (15) and 3.7947 (15) Å]

2-Amino­pyrimidinium 4-hy­droxy­pyridinium-2,6-dicarboxyl­ate monohydrate

In the crystal structure of the title compound, C4H6N3 +·C7H4NO5 −·H2O, inter­molecular N—H⋯N, N—H⋯O and O—H⋯O hydrogen bonds link the cations and anions into almost planar sheets parallel to (102). These hydrogen-bonded sheets are packed into the crystal with the formation of centrosymmetric voids of 68 Å3, which are filled by the water mol­ecules, each of which is disordered over four positions

Phenyl bis­(m-tolyl­amido)­phosphinate

The P atom of the title compound, C20H21N2O2P, has a distorted tetra­hedral configuration; the bond angles at P are in the range 96.11 (6)–117.32 (8)°. The N atom exhibits sp 2 character. In the crystal, mol­ecules are connected via N—H⋯O hydrogen bonds into bands along the a axis, consisting of R 2 2(8) rings

1,4-Diazo­niacyclo­hexane bis­(3-carb­oxy­pyrazine-2-carboxyl­ate) dihydrate

In the title compound, C4H12N2 2+·2C6H3N2O4 −·2H2O or (1,4-dacH2)(pyzdcH)2·2H2O, the complete dication is generated by crystallographic inversion symmetry. An intra­molecular O—H⋯O hydrogen bond occurs in the anion. In the crystal, O—H⋯O, O—H⋯N, N—H⋯O and N—H⋯N hydrogen bonds result in the formation of a three-dimensional network. Additionally, π–π stacking inter­actions between the pyrazine rings with centroid–centroid distances of 3.7065 (2) Å are observed