9-(Biphenyl-4-yloxycarbonyl)-10-methylacridinium trifluoromethanesulfonate

In the crystal structure of the title compound, C27H20NO2+center dot-CF3SO3-, the cations form inversion dimers through pi-pi interactions between the acridine ring systems [centroid-centroid distances = 3.668 (2)-3.994 (2) angstrom]. These dimers are further linked by C-H center dot center dot center dot O and C-H center dot center dot center dot pi interactions. The cation and the anion are connected by C-H center dot center dot center dot O interactions. The mean plane of the acridine ring system makes dihedral angles of 10.6 (1) and 82.5 (1)degrees, respectively, with the adjacent phenyl ring and the carboxy group. The two phenyl rings of the biphenyl group are oriented at 42.9(1)degrees.