title: 9-(2,5-Dimethyl-phen-oxy-carbon-yl)-10-methyl-acridinium trifluoro-methane-sulfonate.
abstract: In the title compound, C(23)H(20)NO(2) (+)·CF(3)SO(3) (-), the acridine ring system is oriented at a dihedral angle of 23.1 (1)° with respect to the benzene ring and the carboxyl group is twisted at an angle of 74.1 (1)° relative to the acridine skeleton. In the crystal, adjacent cations are linked through C-H⋯π inter-actions and neighboring cations and anions via weak C-H⋯O hydrogen bonds. The mean planes of adjacent acridine units are either parallel or inclined at angles of 15.0 (1), 26.9 (1) and 48.1 (1)° in the crystal structure.
authors.affiliation: Faculty of Chemistry, University of Gdańsk, J. Sobieskiego 18, 80-952 Gdańsk,  Poland.
authors.forename: Damian
authors.initials: D
authors.lastname: Trzybiński
authors.forename: Karol
authors.initials: K
authors.lastname: Krzymiński
authors.forename: Jerzy
authors.initials: J
authors.lastname: Błażejowski