Bis­(2-bromo­eth­yl)ammonium bromide

The title salt, C(4)H(10)Br(2)N(+)·Br(−), crystallizes with four cations and four anions in the asymmetric unit. In the crystal, the bis­(2-bromo­eth­yl)ammonium cations and bromide anions are linked into chains by N—H⋯Br hydrogen bonds describing a binary C (2) (1)(4) motif along [010]. Each of these chains is formed by a unique cation and anion pair. The ammonium cations occur in the less preferred anti conformation, characterized by different NCCBr torsion angles. Adjacent chains are linked by weak C—H⋯Br inter­actions, forming a three-dimensional network. The crystal studied was a pseudo-merohedral twin with twin ratio 0.640 (2):0.360 (2).