title: Crystal structure of 3-methyl-pyridinium picrate: a triclinic polymorph.
abstract: The title mol-ecular salt, C6H8N(+)·C6H2N3O7 (-) (systematic name: 3-methyl-pyridinium 2,4,6-tri-nitro-phenolate), 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 R 1 (2)(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 inter-actions 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.
authors.affiliation: PG and Research Department of Chemistry, Seethalakshmi Ramaswami College, Tiruchirappalli 620 002, Tamil Nadu, India.
authors.forename: Jeganathan
authors.initials: J
authors.lastname: Gomathi
authors.affiliation: PG and Research Department of Chemistry, Seethalakshmi Ramaswami College, Tiruchirappalli 620 002, Tamil Nadu, India.
authors.forename: Doraisamyraja
authors.initials: D
authors.lastname: Kalaivani
keywords: 3-methyl­pyridinium picrate; anti­convulsant activity.; crystal structure; triclinic polymorph; π–π stacking