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B(Ge)3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional and consists of one boron molecule and one Ge framework. In the Ge framework, Ge is bonded to eight equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing GeGe8 cuboctahedra. All Ge–Ge bond lengths are 2.84 Å.
BGe3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. B is bonded in a 6-coordinate geometry to six equivalent Ge atoms. All B–Ge bond lengths are 2.79 Å. Ge is bonded in a 12-coordinate geometry to two equivalent B and eight equivalent Ge atoms. There are a spread of Ge–Ge bond distances ranging from 2.70–2.92 Å.
BGe is Wurtzite structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. B3- is bonded to four equivalent Ge3+ atoms to form corner-sharing BGe4 tetrahedra. There are one shorter (2.06 Å) and three longer (2.13 Å) B–Ge bond lengths. Ge3+ is bonded to four equivalent B3- atoms to form corner-sharing GeB4 tetrahedra.
BGe3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. B is bonded in a body-centered cubic geometry to eight equivalent Ge atoms. All B–Ge bond lengths are 2.78 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted body-centered cubic geometry to four equivalent B and four equivalent Ge atoms. All Ge–Ge bond lengths are 2.78 Å. In the second Ge site, Ge is bonded in a body-centered cubic geometry to eight equivalent Ge atoms.