title: 9-Cyano-10-methylacridinium hydrogen dinitrate.
abstract: The title compound, C(15)H(11)N(2)(+).HN(2)O(6)(-), crystallizes in the monoclinic space group C2/c with four molecules in the unit cell. The planar 9-cyano-10-methylacridinium cations lie on crystallographic twofold axes and are arranged in layers, almost perpendicular to the ac plane, in such a way that neighbouring molecules are positioned in a 'head-to-tail' manner. These cations and the hydrogen dinitrate anions are linked through C-H.O interactions involving four of the six O atoms of the anion and the H atoms attached to the C atoms of the acridine moiety in ring positions 2 and 4. The H atom of the hydrogen dinitrate anion appears to be located on the centre of inversion relating two of the four O atoms engaged in the above-mentioned C-H.O interactions. In this way, columns of either anions or cations running along the c axis are held in place by the network of C-H.O interactions, forming a relatively compact crystal lattice.
authors: Ivan Franko L'viv National University, Faculty of Chemistry, Kyrylo and Mefodiy 6, 79005 L'viv, Ukraine.
authors: Olexyj M
authors: OM
authors: Huta
authors: Ihor O
authors: IO
authors: Patsaj
authors: Antoni
authors: A
authors: Konitz
authors: Joanna
authors: J
authors: Meszko
authors: Jerzy
authors: J
authors: Błazejowski