Abstract
The title compound, C12H20N4 2+·2BF4 −, was prepared by the anion exchange of a dibromide ionic liquid with sodium tetrafluoroborate. The asymmetric unit contains one half of the imidazolium cation, which lies about an inversion centre at the mid-point of the central C—C bond of the linking butyl chain. The two planar imidazole rings (r.m.s. deviation = 0.0013 Å) are strictly parallel and separated by 2.625 (7) Å [vertical distance between the centroids of two imidazole rings], giving the molecule a stepped appearance. In the crystal structure, intermolecular C—H⋯F hydrogen bonds link the cations and anions, generating a three-dimensional network.
Highlights
The title compound, C12H20N42+Á2BF4À, was prepared by the anion exchange of a dibromide ionic liquid with sodium tetrafluoroborate
The asymmetric unit contains one half of the imidazolium cation, which lies about an inversion centre at the mid-point of the central C—C bond of the linking butyl chain
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SJ2792)
Summary
Key indicators: single-crystal X-ray study; T = 293 K; mean (C–C) = 0.003 A; R factor = 0.046; wR factor = 0.155; data-to-parameter ratio = 14.8. The title compound, C12H20N42+Á2BF4À, was prepared by the anion exchange of a dibromide ionic liquid with sodium tetrafluoroborate. The asymmetric unit contains one half of the imidazolium cation, which lies about an inversion centre at the mid-point of the central C—C bond of the linking butyl chain. Intermolecular C—HÁ Á ÁF hydrogen bonds link the cations and anions, generating a three-dimensional network. Related literature For properties and applications of ionic liquids, see: Welton (1999); Olivier & Magna (2002); Nicholas et al (2004); Yu et al(2007). See: Leclercq et al (2007); Payagala et al (2007). For bond-length data, see: Allen et al (1987)
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