Hydrogen-bonded network in the salt 4-methyl-1H-imidazol-3-ium picrate

Abstract

In the title molecular salt, C4H7N2+·C6H2N3O7−, the phenolic proton of the starting picric acid has been transferred to the imidazole N atom. The nitro groups are twisted away from the benzene ring plane, making dihedral angles of 12.8 (2), 9.2 (4) and 29.3 (2)°. In the crystal, the component ions are linked into chains along [010] via N—H...O and bifurcated N—H...(O,O) hydrogen bonds. These chains are further linked by weak C—H...O hydrogen bonds into a three-dimensional network. The complex three-dimensional network can be topologically simplified into a 4-connected uninodal net with the point symbol {4.85}.

Keywords

• crystal structure
• salt
• 4-methyimidazole
• picric acid
• uninodal {42.85} net