title: 9-Ethyl-10-methyl-acridinium trifluoro-methane-sulfonate.
abstract: In the mol-ecule of the title compound, C(16)H(16)N(+)·CF(3)SO(3) (-), the central ring adopts a flattened-boat conformation, and the two aromatic rings are oriented at a dihedral angle of 3.94 (2)°. In the crystal structure, weak inter-molecular hydrogen bonds link the mol-ecules. There are π-π contacts between the aromatic rings and the central ring and one of the aromatic rings [centroid-centroid distances = 3.874 (2), 3.945 (2) and 3.814 (2) Å]. There is also an S-O⋯π contact between the central ring and one of the O atoms of the anion.
authors.affiliation: Faculty of Chemistry, University of Gdańsk, Sobieskiego 18, 80-952 Gdańsk, Poland.
authors.forename: Beata
authors.initials: B
authors.lastname: Zadykowicz
authors.forename: Michał
authors.initials: M
authors.lastname: Wera
authors.forename: Artur
authors.initials: A
authors.lastname: Sikorski
authors.forename: Jerzy
authors.initials: J
authors.lastname: Błażejowski