3-(3-Methoxyphenyl)benzo[d]thiazolo[3,2-a]imidazol-9-ium hydrogen sulfate

In the title molecular salt, C16H13N2OS+·HSO4−, the thiazolo[3,2-a]benzimidazolium ring system is roughly planar [maximum deviation = 0.046 (3) Å] and makes a dihedral angle of 58.22 (11)° with the benzene ring. The methoxy group is almost coplanar with its attached benzene ring [Cmethyl—O—C—C = −1.6 (5)°]. In the crystal, the cation is linked to the anion by a bifurcated N—H...(O,O) hydrogen bond, generating anR12(4) ring motif. The ion pairs are then connected by a C—H...O hydrogen bond into inversion dimers and these dimers are further linked by O—H...O hydrogen bonds into an infinite tape along [100]. A π–π stacking interaction [centroid-to-centroid distance = 3.5738 (18) Å] and a short intermolecular contact [S...O = 2.830 (3) Å] are also observed.