In the title hydrated molecular salt, C6H16NO+·C10H5N4O7
−·1.5H2O [systematic name: N,N-diethyl-2-hydroxyethanaminium 5-(2,4-dinitrophenyl)-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-olate sesquihydrate], the dihedral angle between the six-membered rings in the anion is 37.66 (11)°. The nitro groups ortho and para to the ring junction are rotated from their attached ring by 40.8 (3) and 23.5 (3)°, respectively. The ethanol group is disordered over two of the ‘arms’ of the cation in a statistical ratio. In the crystal, [010] chains of anions occur, linked by N—H⋯O and O—H⋯O hydrogen bonds, which generate R
2
2(8) loops. Further N—H⋯O and O—H⋯O hydrogen bonds link the components into a three-dimensional network. One of the water O atoms lies near an inversion centre and is 50% occupied.
The asymmetric unit of the title salt C3H10N+·C10H5N4O7
−·0.125H2O [trivial name: trimethylammonium 5-(2,4-dinitrophenyl)barbiturate 0.125-hydrate], contains two independent cations, two independent anions and a 0.25-occupancy solvent water molecule. In one of the cations, the C atoms are disordered over two sets of sites with refined occupancies of 0.538 (8) and 0.462 (8). In the anions, the dihedral angles between the pyrimidine and benzene rings are 42.77 (6) and 46.55 (7)°. In the crystal, N—H⋯O hydrogen bonds connect anions and cations into chains along [010]. Within these chains, R
2
2(8) ring motifs are formed by inversion-related barbiturate anions. The H atoms of the partial occupancy water molecule were not located nor included in the refinement.
The asymmetric unit of the title molecular salt, C10H16N+·C10H5N4O7
− (trivial name: N,N-diethylanilinium 2,4-dinitrophenylbarbiturate), comprises two anion–cation units. In the anions, the dinitrophenyl ring and the mean plane of the barbiturate ring [planar to within 0.011 (2) and 0.023 (2) Å in the two anions] are inclined to one another by 41.47 (9) and 45.12 (9)°. In the crystal, the anions are linked via strong N—H⋯O hydrogen bonds, forming chains propagating along [10-1]. Within the chains, adjacent inversion-related anionic barbiturate entities are joined through R
2
2(8) ring motifs. The cations are linked to the chains via N—H⋯O hydrogen bonds. The chains are linked via a number of C—H⋯O interactions, forming a three-dimensional structure.
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