Abstract
In the crystal structure of the title compound, C21H15BrNO2 +·CF3SO3 −, 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.
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