Abstract

The asymmetric unit of the title compound, C(17)H(13)N(4)(+)center dot BF(4) , contains one half of the benzimidazolium cation and one half of the tetrafluoridoborate anion, with crystallographic mirror planes bisecting the molecules. One F atom of the tetrafluoridoborate is equally disordered about a crystallographic mirror plane. In the crystal, C-H center dot center dot center dot F interactions link the cations and anions into layers parallel to (100). The crystal packing is further stabilized by F center dot center dot center dot pi contacts involving the tetrafluoridoborate anions and the five-membered rings F center dot center dot center dot centroid = 2.811 (2) angstrom].