Bis(1,3-diethyl-benzimidazolium) tetra-bromidomercurate(II).

In the title compound, (C(11)H(15)N(2))(2)[HgBr(4)], the tetra-coordinated Hg(II) center of the complex anion adopts a distorted tetra-hedral geometry [Hg-Br = 2.5755 (8)-2.623 (11) Å and Br-Hg-Br = 103.

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

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-naphthyl-meth-yl)benzimidazolium anion lies across a centre of inversion. The dihedral angle between the benzimidazolium and naphthalene ring systems is 81.

1-Benzyl-imidazolium hexa-fluoro-phosphate-1-benzyl-imidazole (1/1).

In the title compound, C(10)H(11)N(2) (+)·PF(6) (-)·C(10)H(10)N(2), the H atom involved in protonation is disordered equally between the cation and the neutral mol-ecule. The dihedral angle between the phenyl and imidazole rings is 82.6 (2)°.