Trimethyl­ammonium 2,6-dioxo-5-(2,4,6-trinitro­phen­yl)-1,2,3,6-tetra­hydro­pyrimidin-4-olate

In the title barbiturate salt (trivial name: trimethyl­ammonium 2,4,6-trinitro­phenyl­barbiturate), C₃H₁₀N⁺·C₁₀H₄N₅O₉⁻, the asymmetric unit contains two sets of anion–cation moieties. The dihedral angle between the rings in the anions are 44.0 (3) and 45.7 (3)°. Adjacent anions are connected into ribbons along [100] through R₂²(8) ring motifs formed by N—H...O hydrogen bonds involving the barbiturate rings. Attached to both sides of these ribbons via N—H...O hydrogen bonds are the trimethyl­ammonium cations. C—H...O hydrogen bonds are also observed.

N,N-Diethyl-2-hy­droxy­ethanaminium 5-(5-chloro-2,4-dinitro­phen­yl)-2,6-dioxo-1,2,3,6-tetra­hydro­pyrimidin-4-olate hemihydrate

The asymmetric unit of the title salt, C₆H₁₆NO⁺·C₁₀H₄ClN₄O₇⁻·0.5H₂O, contains two cations, two anions and one water mol­ecule. In one independent anion, one nitro group is rotationally disordered over two orientations in a 0.657 (8):0.343 (8) ratio. In the crystal, inter­molecular N—H...O and O—H...O hydrogen bonds link all the components into ribbons extending along [100].

2-Methyl­pyridinium 5-(2,4-dinitro­phen­yl)-1,3-dimethyl­barbiturate

In the title mol­ecular salt [systematic name: 2-methyl­pyridinium 5-(2,4-dinitro­phen­yl)-1,3-dimethyl-2,6-dioxo-1,2,3,6-tetra­hydro­pyrimidin-4-olate], C₆H₈N⁺·C₁₂H₉N₄O₇⁻, the cation and anion are linked a through strong N—H...O hydrogen bond. In the crystal, C—H...O inter­actions link the ions, generating a chain along [010].

Triethyl­ammonium 1,3-dimethyl-5-(2,4,6-trinitro­phenyl)barbiturate

In the title mol­ecular salt [systematic name: triethyl­ammonium 1,3-dimethyl-2,6-dioxo-5-(2,4,6-trinitro­phen­yl)-1,2,3,6-tetra­hydro­pyrimidin-4-olate], C₆H₁₆N⁺·C₁₂H₈N₅O₉⁻, the dihedral angle between the aromatic rings in the anion is 46.88 (8)°. The nitro group para to the ring junction is almost coplanar with its attached ring [dihedral angle = 0.76 (3)°], but the two ortho-nitro groups are substanti­ally twisted from the ring plane, by 47.91 (2) and 42.90 (1)°. In the crystal, the cation and anion are linked by an N—H...O=C hydrogen bond; these dimeric associations are further connected by weak C—H...O bonds to form linear supra­molecular chains extending in the [001] direction.

1-(5-Amino-2,4-dinitro­phen­yl)pyridinium chloride monohydrate

In the cation of the title hydrated salt, C₁₁H₉N₄O₄⁺·Cl⁻·H₂O, the six-membered rings are inclined to each other at 79.0 (1)° and an intra­molecular N—H...O hydrogen bond occurs. In the crystal, N—H...Cl hydrogen bonds link two cations and two anions into centrosymmetric group, and O—H...Cl hydrogen bonds involving the water mol­ecules further link these groups into chains in [101]. An O—H...O inter­action is also present. The water mol­ecule is disordered over two sets of sites in a 0.555 (13):0.445 (13) ratio

Bis(2,4-dinitro­phen­yl)sulfane

In the title compound, C₁₂H₆N₄O₈S, the dinitro­phenyl rings subtend an angle of 78.46 (13) °. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds leading to the formation of a two-dimensional network lying parallel to the bc plane.