4-Cyano-anilinium bromide.

In the crystal structure of the title compound, C(7)H(7)N(2) (+)·Br(-), the cations are associated into inversion dimers through weak pairwise C-H⋯N hydrogen bonds. The dimers further form stepped sheets via weak pairwise C-H⋯N hydrogen bonds. In the sheets, the spacing between the mean planes of the laterally displaced aromatic rings in adjacent dimers is 1.124†(6)†à . Three N-H⋯Br inter-actions and two weak C-H⋯Br inter-actions per cation tie the sheets together.