Morpholine–4-nitrophenol (1/2)

In the title adduct, 2C6H5NO3·C4H9NO, the morpholine ring adopts a chair conformation. The dihedral angle between the two nitrophenol rings is 69.47 (9)°. The nitro groups attached to the benzene rings make dihedral angles of 3.37 (16) and 3.14 (13)° in the two molecules of nitrophenol. The crystal structure is stabilized by N—H...O, O—H...N and O—H...O hydrogen bonds and further consolidated by C—H...O interactions, resulting in a three-dimensional network

4-Nitrophenol–piperazine (2/1)

In the title adduct, C6H5NO3·0.5C4H10N2, the piperazine ring possesses inversion symmetry and has a chair conformation. Its mean plane makes a dihedral angle of 65.45 (7)° with the 4-nitrophenol ring. In the crystal, the piperazine ring is linked to two 4-nitrophenol molecules via O—H...N hydrogen bonds. The molecules are also linked via bifurcated N—H...(O,O) hydrogen bonds involving the NO2 O atoms, forming a two-dimensional network lying parallel to (102). The networks are linked via C—H...O hydrogen bonds, forming a three-dimensional structure

2-Amino-4-methylpyridinium 2-nitrobenzoate

In the title molecular salt, C6H9N2+·C7H4NO4−, the original pyridine N atom of 2-amino-4-methylpyridine is protonated and the carboxylic acid group of nitrobenzoic acid is deprotonated. In the crystal, the ions are linked by N—H...O hydrogen bonds, forming chains propagating along [001]. The chains are linked via C—H...O hydrogen bonds, forming two-dimensional networks lying parallel to the bc plane

1-[2-(3-Methoxyphenyl)ethyl]pyrrolidine-2,5-dione

In the title compound, C13H15NO3, the pyrrolidine ring makes a dihedral angle of 4.69 (9)° with the 3-methoxy-phenyl ring. In the crystal, hydrogen-bonded chains running along [101] are generated by connecting neighbouring molecules via C—H...O hydrogen bonds. Parallel chains are linked by further C—H...O hydrogen bonds, forming a three-dimensional structure