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RuB2 crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. Ru6+ is bonded in a 8-coordinate geometry to eight equivalent B3- atoms. There are a spread of Ru–B bond distances ranging from 2.17–2.28 Å. B3- is bonded in a 7-coordinate geometry to four equivalent Ru6+ and three equivalent B3- atoms. There is one shorter (1.83 Å) and two longer (1.89 Å) B–B bond length.
Ru2B3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ru+4.50+ is bonded in a 7-coordinate geometry to seven B3- atoms. There are one shorter (2.19 Å) and six longer (2.20 Å) Ru–B bond lengths. There are two inequivalent B3- sites. In the first B3- site, B3- is bonded to six equivalent Ru+4.50+ atoms to form distorted edge-sharing BRu6 pentagonal pyramids. In the second B3- site, B3- is bonded in a 7-coordinate geometry to four equivalent Ru+4.50+ and three equivalent B3- atoms. All B–B bond lengths are 1.86 Å.
Ru7B3 crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. there are three inequivalent Ru sites. In the first Ru site, Ru is bonded in a 3-coordinate geometry to three equivalent B atoms. All Ru–B bond lengths are 2.19 Å. In the second Ru site, Ru is bonded in a 3-coordinate geometry to three equivalent B atoms. There are one shorter (2.14 Å) and two longer (2.21 Å) Ru–B bond lengths. In the third Ru site, Ru is bonded in a distorted water-like geometry to two equivalent B atoms. Both Ru–B bond lengths are 2.15 Å. B is bonded in a 6-coordinate geometry to six Ru atoms.
Ru11B8 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are six inequivalent Ru+2.18+ sites. In the first Ru+2.18+ site, Ru+2.18+ is bonded in a 5-coordinate geometry to five B3- atoms. There are a spread of Ru–B bond distances ranging from 2.23–2.76 Å. In the second Ru+2.18+ site, Ru+2.18+ is bonded in a square co-planar geometry to four equivalent B3- atoms. All Ru–B bond lengths are 2.25 Å. In the third Ru+2.18+ site, Ru+2.18+ is bonded in a 6-coordinate geometry to six B3- atoms. There are two shorter (2.29 Å) and four longer (2.32 Å) Ru–B bond lengths. In the fourth Ru+2.18+ site, Ru+2.18+ is bonded in a trigonal non-coplanar geometry to three B3- atoms. There are two shorter (2.12 Å) and one longer (2.19 Å) Ru–B bond lengths. In the fifth Ru+2.18+ site, Ru+2.18+ is bonded in a 7-coordinate geometry to seven B3- atoms. There are a spread of Ru–B bond distances ranging from 2.21–2.46 Å. In the sixth Ru+2.18+ site, Ru+2.18+ is bonded in a 4-coordinate geometry to four B3- atoms. There are a spread of Ru–B bond distances ranging from 2.15–2.53 Å. There are four inequivalent B3- sites. In the first B3- site, B3- is bonded in a 7-coordinate geometry to seven Ru+2.18+ atoms. In the second B3- site, B3- is bonded in a 7-coordinate geometry to six Ru+2.18+ and two equivalent B3- atoms. Both B–B bond lengths are 1.80 Å. In the third B3- site, B3- is bonded in a 2-coordinate geometry to eight Ru+2.18+ and one B3- atom. The B–B bond length is 2.01 Å. In the fourth B3- site, B3- is bonded in a 9-coordinate geometry to six Ru+2.18+ and three B3- atoms.