Acta Cryst. (2012). E68, o3066 [ doi:10.1107/S1600536812040937 ]
Abstract: In the title salt, C6H10N22+·2Br-, the non-H atoms of the 3-methylpyridinium unit of the cation are almost coplanar (r.m.s. deviation = 0.0052 Å). In the crystal, the dications and Br anions are linked by a combination of six hydrogen bonds, viz. one Npy-HBr, two C-HBr and three H2N-HBr, into supramolecular layers, parallel to the bc plane, composed of alternating R24(10) and R24(8) loops. Weak - interactions between cationic rings with centroid-centroid distances of 3.891 (2) Å are also observed.
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