Bis(2,6-dimethyl­pyridinium) dibromo­iodate bromide

In the title salt, 2C₇H₁₀N⁺·IBr₂⁻·Br⁻, each of the anions, viz. [IBr₂]⁻ and Br⁻, lie on a twofold axis. The IBr₂⁻ anion is almost linear, with a Br—I—Br angle of 178.25 (3)°. The cation is essentially planar (r.m.s. deviation = 0.0067 Å). In the crystal, each Br⁻ anion links two cations via N—H...Br...H—N hydrogen-bonding inter­actions.

2-Amino-5-methyl­pyridinium dibromo­iodate

In the title salt, C₆H₉N₂⁺·Br₂I⁻, the cation is essentially planar (r.m.s. deviation = 0.0062 Å for the non-H atoms) while the anion is almost linear with a Br—I—Br angle of 177.67 (2)°. The crystal packing shows two anions and two cations connected via N—H...Br and (pyridine)N—H...Br hydrogen-bonding inter­actions, forming centrosymmetric tetra­mers with R₄⁴(16) ring motifs. Very weak offset aromatic π–π stacking interactions [centroid-centroid separation = 4.038 (4), slippage = 1.773 Å] also occur.