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HoB12 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Ho is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Ho–B bond lengths are 2.78 Å. B is bonded in a 7-coordinate geometry to two equivalent Ho and five equivalent B atoms. There is one shorter (1.72 Å) and four longer (1.79 Å) B–B bond length.
HoB2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ho is bonded to twelve equivalent B atoms to form a mixture of edge and face-sharing HoB12 cuboctahedra. All Ho–B bond lengths are 2.70 Å. B is bonded in a 9-coordinate geometry to six equivalent Ho and three equivalent B atoms. All B–B bond lengths are 1.90 Å.
Ho2ReB6 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are two inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 4-coordinate geometry to fourteen B2- atoms. There are a spread of Ho–B bond distances ranging from 2.74–2.83 Å. In the second Ho3+ site, Ho3+ is bonded to twelve B2- atoms to form a mixture of edge and face-sharing HoB12 cuboctahedra. There are a spread of Ho–B bond distances ranging from 2.59–2.62 Å. Re6+ is bonded in a 10-coordinate geometry to ten B2- atoms. There are a spread of Re–B bond distances ranging from 2.36–2.41 Å. There are six inequivalent B2- sites. In the first B2- site, B2- is bonded in a 9-coordinate geometry to six Ho3+ and three B2- atoms. There are a spread of B–B bond distances ranging from 1.84–1.95 Å. In the second B2- site, B2- is bonded in a 3-coordinate geometry to four equivalent Ho3+, two equivalent Re6+, and three B2- atoms. There are a spread of B–B bond distances ranging from 1.80–1.83 Å. In the third B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Re6+, and three B2- atoms. The B–B bond length is 1.81 Å. In the fourth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Re6+, and three B2- atoms. There is one shorter (1.74 Å) and one longer (1.85 Å) B–B bond length. In the fifth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Re6+, and three B2- atoms. The B–B bond length is 1.80 Å. In the sixth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Re6+, and three B2- atoms.
Ho2RuB6 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are two inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 12-coordinate geometry to fourteen B2- atoms. There are a spread of Ho–B bond distances ranging from 2.72–2.80 Å. In the second Ho3+ site, Ho3+ is bonded to twelve B2- atoms to form a mixture of edge and face-sharing HoB12 cuboctahedra. There are a spread of Ho–B bond distances ranging from 2.59–2.62 Å. Ru6+ is bonded in a 10-coordinate geometry to ten B2- atoms. There are a spread of Ru–B bond distances ranging from 2.34–2.40 Å. There are six inequivalent B2- sites. In the first B2- site, B2- is bonded in a 9-coordinate geometry to four equivalent Ho3+, two equivalent Ru6+, and three B2- atoms. There are a spread of B–B bond distances ranging from 1.78–1.83 Å. In the second B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Ru6+, and three B2- atoms. Both B–B bond lengths are 1.81 Å. In the third B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Ru6+, and three B2- atoms. There is one shorter (1.73 Å) and one longer (1.86 Å) B–B bond length. In the fourth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Ru6+, and three B2- atoms. Both B–B bond lengths are 1.79 Å. In the fifth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Ru6+, and three B2- atoms. In the sixth B2- site, B2- is bonded in a 9-coordinate geometry to six Ho3+ and three B2- atoms. The B–B bond length is 2.12 Å.
Ho2OsB6 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are two inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 6-coordinate geometry to fourteen B2- atoms. There are a spread of Ho–B bond distances ranging from 2.72–2.81 Å. In the second Ho3+ site, Ho3+ is bonded to twelve B2- atoms to form a mixture of edge and face-sharing HoB12 cuboctahedra. There are a spread of Ho–B bond distances ranging from 2.59–2.62 Å. Os6+ is bonded in a 10-coordinate geometry to ten B2- atoms. There are a spread of Os–B bond distances ranging from 2.34–2.41 Å. There are six inequivalent B2- sites. In the first B2- site, B2- is bonded in a 9-coordinate geometry to four equivalent Ho3+, two equivalent Os6+, and three B2- atoms. There are a spread of B–B bond distances ranging from 1.78–1.83 Å. In the second B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Os6+, and three B2- atoms. Both B–B bond lengths are 1.81 Å. In the third B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Os6+, and three B2- atoms. There is one shorter (1.73 Å) and one longer (1.86 Å) B–B bond length. In the fourth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Os6+, and three B2- atoms. Both B–B bond lengths are 1.79 Å. In the fifth B2- site, B2- is bonded in a 9-coordinate geometry to four Ho3+, two equivalent Os6+, and three B2- atoms. In the sixth B2- site, B2- is bonded in a 9-coordinate geometry to six Ho3+ and three B2- atoms. The B–B bond length is 2.14 Å.