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  1. ; ; ( , IUCrData)
    The asymmetric unit of the title salt, C 21 H 18 N 4 2+ ·2Br − , comprises half of the molecule and a bromide ion. The chevron-shaped cations stack as columns in the [001] direction with suitable intermolecular distance for π–π interactions. These cationic columns are further stabilized by intercolumnar C—H...N hydrogen bonding with the bromide ions distributed between them. 
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  2. ; ; ( , IUCrData)
    The chevron-shaped cations of the title hydrated salt, C 25 H 22 N 4 2+ ·2Br − ·2H 2 O, are arranged in back-to-back alternating directions to form a zigzag ribbon propagating along the [010] direction. Intermolecular interactions comprising these ribbons are π–π interactions between the pyridinium and adjacent pyridyl rings, as well as O—H...O hydrogen bonding between water molecules and two adjacent pyridyl N atoms. Half of the cation is generated by the mirror plane. The water O atoms, the central C atom and one Br atom are located on this mirror plane while the other Br atom is on a twofold screw axis. 
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  3. ; ; ; ; ; ; ; ; ; ; et al ( , The Astronomical Journal)
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