Table 1. Inter­molecular H⋯F distances (Å) between all eight fluorine atoms of the two BF₄ ⁻ anions.

F1⋯H1A	2.16	F5iii⋯H7A iv	2.30
F1⋯H20B	2.43	F5iii⋯H4A iv	2.35
F2⋯H9A ii	2.43	F6iii⋯H20C i	2.28
F3⋯H9A ii	2.57	F7iii⋯H20A	2.34
F4⋯H2A	2.43 (4)	F8iii⋯H22C	2.34

Symmetry codes: (i) −x, y,  − z; (ii) x, 1 − y,  + z; (iii)  − x,  + y, z; (iv) x, 1 + y, z.