1-Methyl-3-(2-oxo-2H-chromen-3-yl)-1H-imidazol-3-ium picrate

The title salt, C₁₃H₁₁N₂O₂⁺·C₆H₂N₃O₇⁻, is the unexpected product of a domino reaction of 3-cyano­methyl-1-methyl­imidazolium chloride with salicylic aldehyde in the presence of picric acid. In the cation, the 1H-imidazole ring is twisted by 63.2 (1)° from the 2H-chromen plane. In the crystal, cations and anions are alternately stacked along the a axis through π–π stacking inter­actions between the almost parallel aromatic rings [centroid–centroid distances = 3.458 (2) and 3.678 (2) Å]. The stacks are further linked by C—H...O hydrogen bonds into a two-tier layer parallel to (001).