Crystal structure of 1-butyl-3-{2-[(indan-5-yl)amino]-2-oxoeth­yl}-1H-imidazol-3-ium chloride

In the cation of the title mol­ecular salt, C18H24N3O+·Cl−, an intra­molecular C—H⋯O hydrogen bond stabilizes the almost coplanar orientation of the aromatic ring of the indane unit and the amide plane. In the crystal, the packing is dominated by inter­molecular C—H⋯Cl hydrogen-bonding inter­actions that result in the formation of slab-like structures propagating along [010]. The slabs are linked by weak C—H⋯O inter­actions, forming layers lying parallel to (100). The methyl­ene carbon atom of the indanyl substituent is disordered over two positions with a refined occupancy ratio of 0.84 (2):0.16 (2). The crystal studied was refined as a twin with matrix [1 0 0.9, 0 \overline{1} 0, 0 0 \overline{1}]; the resulting BASF value is 0.30.