Phenazin-5-ium bromide

In the title compound, C12H9N2+·Br , the protonated tricyclic ring system is slightly twisted, with a dihedral angle of 3.9 (1)° between the two outer benzene rings. In the crystal, N—H...Br and C—H...Br hydrogen bonds link two cations and two bromide anions into centrosymmetric assemblies, which are further packed into stacks along [010] via π–π interactions between the aromatic rings [centroid–centroid distance = 3.725 (4) ].