9-(4-Bromo­phenoxy­carbon­yl)-10-methyl­acridinium trifluoro­methane­sulfonate

In the crystal structure of the title compound, C(21)H(15)BrNO(2) (+)·CF(3)SO(3) (−), the cations form inversion dimers through π–π inter­actions between the acridine ring systems. These dimers are further linked by C—H⋯π and C—Br⋯π inter­actions. The cations and anions are connected by multidirectional C—H⋯O and C—F⋯π inter­actions. The acridine and benzene ring systems are oriented at 10.8 (1)°. The carboxyl group is twisted at an angle of 85.2 (1)° relative to the acridine skeleton. The mean planes of adjacent acridine units are parallel or almost parallel [inclined at an angle of 1.4 (1)°] in the crystal structure.