Bis(1-methyl­piperazine-1,4-diium) di-μ-bromido-bis­[tetra­bromido­bismuthate(III)] dihydrate

In the title hydrated salt, (C(5)H(14)N(2))(2)[Bi(2)Br(10)]·2H(2)O, the com­plete [Bi(2)Br(10)](4−) biocta­hedron is generated by crystallographic inversion symmetry. The diprotonated piperazine ring adopts a chair conformation, with the methyl group occupying an equatorial position. In the crystal, the tetra­anions and water mol­ecules are linked by O—H⋯Br and O—H⋯(Br,Br) hydrogen bonds to generate [100] chains. The chains are crosslinked by N—H⋯Br, N—H⋯O and C—H⋯Br hydrogen bonds originating from the piperazinediium dications, thereby forming a three-dimensional network.