10-Methyl-9-phenoxy­carbonyl­acridinium trifluoro­methane­sulfonate monohydrate

In the crystal structure of the title compound, C(21)H(16)NO(2) (+)·CF(3)SO(3) (−)·H(2)O, the anions and the water mol­ecules are linked by O—H⋯O inter­actions, while the cations form inversion dimers through π–π inter­actions between acridine ring systems. These dimers are linked by C—H⋯O and C—F⋯π inter­actions to adjacent anions, and by C—H⋯π inter­actions to neighboring cations. The water mol­ecule links two H atoms of the cation by C—H⋯O inter­actions and two adjacent anions by O—H⋯O inter­actions. The acridine and benzene ring systems are oriented at 15.6 (1)°. The carboxyl group is twisted at an angle of 77.0 (1)° relative to the acridine skeleton. The mean planes of the adjacent acridine units are either parallel or inclined at an angle of 18.4 (1)°.