Acta Cryst. (2008). E64, m1318 [ doi:10.1107/S1600536808030286 ]
Abstract: In the title compound, Na+·4C7H5N6+·5BF4-, the Na+ ion lies on a fourfold rotation axis and one of the tetrafluoridoborate ions lies on a site of symmetry . Each Na+ ion is surrounded by four symmetry-related tetrafluoridoborate ions, and is eight-coordinated by F atoms, the NaF separation being 2.3956 (15) or 2.4347 (17) Å. The hexaazaphenalenium ring system is essentially planar. In the crystal structure, the cations and anions are linked into a three-dimensional network by N-HN and C-HF hydrogen bonds.
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