Bis(2-bromoethyl)ammonium bromide

The title salt, C4H10Br2N+·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 C21(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).