Abstract
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 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).
Highlights
The title salt, C4H10Br2N+ÁBrÀ, crystallizes with four cations and four anions in the asymmetric unit
The bis(2-bromoethyl)ammonium cations and bromide anions are linked into chains by N—HÁ Á ÁBr hydrogen bonds describing a binary C12(4) motif along [010]
Adjacent chains are linked by weak C—HÁ Á ÁBr interactions, forming a three-dimensional network
Summary
Key indicators: single-crystal X-ray study; T = 173 K; mean (C–C) = 0.050 A; R factor = 0.107; wR factor = 0.285; data-to-parameter ratio = 23.5. The title salt, C4H10Br2N+ÁBrÀ, crystallizes with four cations and four anions in the asymmetric unit. The bis(2-bromoethyl)ammonium cations and bromide anions are linked into chains by N—HÁ Á ÁBr hydrogen bonds describing a binary C12(4) motif along [010]. Each of these chains is formed by a unique cation and anion pair. Adjacent chains are linked by weak C—HÁ Á ÁBr interactions, forming a three-dimensional network. The crystal studied was a pseudo-merohedral twin with twin ratio 0.640 (2):0.360 (2). For the preparation of N-bis(2bromoethylamine) hydrobromide, see: Pettit et al (1964)
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