Received 24 August 2009
In the title salt, C11H13N2+·C6H2N3O7-, the dihedral angles between the benzene ring in the cation and the imidazolium ring and the benzene ring of the picrate anion are 113.7 (2) and 116.3 (2)°, respectively. The imidazolium ring is nearly parallel to the benzene ring of the picrate anion, the dihedral angle between the planes being 2.6 (1)°. The nitro groups in the picrate anions are disordered (occupancy ratio 0.54:0.46). The crystal packing is stabilized by weak C-HO interactions between the cation-anion pairs.
For civilian and military applications of energetic materials, see: Sikder & Sikder (2004). Heterocyclic organic salts with low melting points are a new class of energetic materials, which have attracted considerable interest because of their `green chemistry' properties, see: Singh et al. (2006). Picric acid is a polynitrogen compound with explosive character and imidazolium-based cation picrate salts are good candidates for energetic ionic salts, see: Jin et al. (2005).
Data collection: SMART (Bruker, 2001); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: JJ2007 ).
We gratefully acknowledge the financial support of the National Science Funds for Distinguished Young Scholars of Hubei Province (grant No. 2006ABB038), the Outstanding Mid-young Scholars' Programs, Hubei Provincial Department of Education (Q20072203) and the project sponsored by SRF for ROCS, SEM (200724).
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