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

In the crystal of the title compound, C21H15ClNO2+center dot CF3SO3-, adjacent cations are linked through C-H center dot center dot center dot pi and pi-pi interactions [centroid-centroid distance = 3.987 (2) angstrom], and neighboring cations and anions via C-H center dot center dot center dot O and C-F center dot center dot center dot pi interactions. The acridine ring system and benzene ring are oriented at a dihedral angle of 1.0 (1)degrees while the carboxyl group is twisted at an angle of 85.0 (1)degrees relative to the acridine skeleton. The mean planes of adjacent acridine units are either parallel or inclined at an angle of 78.2 (1)degrees in the crystal structure.