2,6-Dimethylpyridinium bromide

Abstract

The asymmetric unit of the title salt, C7H10N+·Br−, comprises two 2,6-dimethylpyridinium cations and two bromide anions. One cation and one anion are situated in general positions, while the other cation and the other anion lie on a crystallographic mirror plane parallel to (010). Each pair of ions interact via N—H...Br and C—H...Br hydrogen bonding, generating motifs depending on the cation and anion involved. Thus, the cation and the anion on the mirror plane generate infinite chains along the c axis, while the other ionic pair leads to sheets parallel to the ac plane. In the overall crystal packing, both motifs alternate along the b axis, with a single layer of the chain motif sandwiched between two double layers of the sheet motif. The sheets and chains are further connected via aryl π–π interactions [centroid–centroid distances = 3.690 (2) and 3.714 (2) Å], giving a three-dimensional network.