Crystal structure of the tetra­gonal polymorph of bis­(1-ethyl-3-methyl­imidazolium) tetra­bromido­cadmate

Both unique Cd atoms in the tetra­gonal polymorph of bis­(1-ethyl-3-methyl­imidazolium) tetra­bromido­cadmate, (C(6)H(11)N(2))(2)[CdBr(4)], occupy special positions (site symmetry -4). The crystal structure consists of isolated tetra­hedral [CdBr(4)](2−) anions which are surrounded by 1-ethyl-3-methyl­imidazolium cations. The methyl and ethyl side chains of the cations show positional disorder in a 0.590 (11):0.410 (11) ratio. In the crystal, (C(6)H(11)N(2))(+) cations display three weak C—H⋯Br hydrogen-bond inter­actions through the imidazolium ring H atoms with the Br(−) ligands of the surrounding complex anions. The alkyl groups of the side chains are not involved in hydrogen bonding.