1,1'-Methyl-enebis(4,4'-bipyridin-1-ium) dibromide.

The asymmetric unit of the title salt, C 21 H 18 N 4 2+ ·2Br - , comprises half of the mol-ecule and a bromide ion. The chevron-shaped cations stack as columns in the [001] direction with suitable inter-molecular distance for π-π inter-actions. These cationic columns are further stabilized by inter-columnar C-H⋯N hydrogen bonding with the bromide ions distributed between them.