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SiF4 is Silicon tetrafluoride structured and crystallizes in the cubic I-43m space group. The structure is zero-dimensional and consists of two silane, tetrafluoro- molecules. Si4+ is bonded in a tetrahedral geometry to four equivalent F1- atoms. All Si–F bond lengths are 1.58 Å. F1- is bonded in a single-bond geometry to one Si4+ atom.
(Si)6F2 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four hydrofluoric acid molecules and one Si framework. In the Si framework, there are two inequivalent Si sites. In the first Si site, Si is bonded in a 4-coordinate geometry to four equivalent Si atoms. All Si–Si bond lengths are 2.59 Å. In the second Si site, Si is bonded in a body-centered cubic geometry to eight equivalent Si atoms.