Received 25 October 2012
In the imidazolium cation of the title compound, C19H19N4O2+·Cl-·C3H7NO, the dihedral angles between the imidazole ring and the phenyl rings are 85.86 (4) and 70.26 (5)°. In the crystal, N-HCl hydrogen bonds link the imdiazolium cations and chloride anions into zigzag chains along  and together with C-HCl and C-HO hydrogen bonds, which involve also the dimethylformamide solvent molecule, form a two-dimensional network extending across the ab plane.
For the crystal structures of the non-solvated title compound and an acetonitrile monosolvate, see: Liao & Lee (2012) and Liao & Lee (2011), respectively. For the crystal structures of nickel, palladium, and silver complexes with ligands derived from the title compound, see: Liao, Chan, Chang et al. (2007), Liao, Chan, Zeng et al. (2007) and Liao et al. (2008), respectively.
Data collection: APEX2 (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; 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: DIAMOND (Brandenburg, 2006).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: ZS2241 ).
We thank the National Science Council of Taiwan for financial support of this work.
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