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In the title compound, (C 22 H 23 N 2 )[Hg 2 I 6 ] 0.5 ·(CH 3 ) 2 SO, the 1-butyl-3-(1-naphthyl­meth­yl)benzimidazolium anion lies across a centre of inversion. The dihedral angle between the benzimidazolium and naphthalene ring systems is 81.9 (3)°. In the crystal structure, π–π stacking inter­actions are observed between the imidazolium ring and the unsubstituted benzene ring of the naphthalene ring system, with a centroid–centroid separation of 3.510 (5) Å. In the centrosymmetric anion, the Hg(II) atoms are in a distorted tetrahedral coordination. The dimethyl sulfoxide solvent mol­ecule is disordered over two sites with occupancies of 0.615 (9) and 0.385 (9).

1-Butyl-3-(1-naphthylmethyl)benzimidazolium hemi{di-μ-iodido-bis[diiodidomercurate(II)]} dimethyl sulfoxide monosolvate