Crystal structure of 3-methylpyridinium picrate: a triclinic polymorph

Abstract

The title molecular salt, C6H8N+·C6H2N3O7− (systematic name: 3-methylpyridinium 2,4,6-trinitrophenolate), crystallizes in the triclinic space group P-1. The crystal structure of the monoclinic polymorph (space group P21/n) has been reported [Stilinovic & Kaitner (2011). Cryst. Growth Des. 11, 4110–4119]. In the crystal, the anion and cation are linked via bifurcated N—H...(O,O) hydrogen bonds, enclosing an R12(6) graph-set motif. These units are linked via C—H...O hydrogen bonds, forming a three-dimensional framework. Within the framework there are π–π interactions present, involving inversion-related picrate anions and inversion-related pyridinium cations, with inter-centroid distances of 3.7389 (14) and 3.560 (2) Å, respectively.

Keywords

• crystal structure
• 3-methylpyridinium picrate
• triclinic polymorph
• π–π stacking
• anticonvulsant activity.