Abstract
In the crystal structure of the title molecular salt, C21H15FNO2 +·CF3SO3 −·H2O, the cations form inversion dimers through π–π interactions between the acridine ring systems. These dimers are linked via C—H⋯O and C—F⋯π interactions to adjacent anions, and by C—H⋯π and C—F⋯π interactions to neighbouring cations. The water molecule links two sites of the cation by C—H⋯O interactions and two adjacent anions by O—H⋯O hydrogen bonds. The mean planes of the acridine and benzene ring systems are oriented at a dihedral angle of 15.1 (1)°. The carboxyl group is twisted at an angle of 84.5 (1)° relative to the acridine skeleton. The mean planes of the acridine ring systems are parallel in the crystal.
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