Received 17 April 2008
In the cation of the title compound, C18H13N2+·NO3-, the two bicyclic ring systems form a dihedral angle of 3.84 (4)°. The nitrate anion is disordered over two orientations in a 0.9:0.1 ratio. In the crystal structure, the cations form stacks along the a axis, with short intermolecular contacts [CC = 3.330 (3) and 3.345 (4) Å], and link to the anions via N-HO hydrogen bonds.
Data collection: SMART (Bruker, 1998); cell refinement: SAINT-Plus (Bruker, 1998); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CV2401 ).
We are grateful to the Islamic Azad University, North Tehran Branch, for financial support.
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