title: 9-Chloro-2,4-dimethoxy-acridinium trifluoro-methane-sulfonate.
abstract: In the mol-ecular structure of the title compound, C(15)H(13)ClNO(2) (+)·CF(3)SO(3) (-), the meth-oxy groups are nearly coplanar with the acridine ring system, making dihedral angles of 0.4 (2) and 5.1 (2)°. Multidirectional π-π contacts between acridine units are observed in the crystal structure. N-H⋯O and C-H⋯O hydrogen bonds link cations and anions, forming a layer structure.
authors.affiliation: Faculty of Chemistry, University of Gdańsk, J. Sobieskiego 18, 80-952 Gdańsk, Poland.
authors.forename: Beata
authors.initials: B
authors.lastname: Zadykowicz
authors.forename: Karol
authors.initials: K
authors.lastname: Krzymiński
authors.forename: Damian
authors.initials: D
authors.lastname: Trzybiński
authors.forename: Artur
authors.initials: A
authors.lastname: Sikorski
authors.forename: Jerzy
authors.initials: J
authors.lastname: Błażejowski