Co(Rh2B)3 crystallizes in the monoclinic Cm space group. There are nine inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 3-coordinate geometry to one B(3) and two equivalent B(2) atoms. In the second Rh site, Rh(2) is bonded in a 3-coordinate geometry to one B(1), one B(2), and one B(4) atom. In the third Rh site, Rh(3) is bonded in a 3-coordinate geometry to one B(1) and two equivalent B(4) atoms. In the fourth Rh site, Rh(4) is bonded in a 3-coordinate geometry to one B(2), one B(3), and one B(4) atom. In the fifth Rh site, Rh(5) is bonded in a 3-coordinate geometry to one B(1) and two equivalent B(2) atoms. In the sixth Rh site, Rh(6) is bonded in a 3-coordinate geometry to one B(3) and two equivalent B(4) atoms. In the seventh Rh site, Rh(7) is bonded in a distorted water-like geometry to two equivalent B(4) atoms. In the eighth Rh site, Rh(8) is bonded in a 2-coordinate geometry to one B(3) and one B(4) atom. In the ninth Rh site, Rh(9) is bonded in a distorted water-like geometry to two equivalent B(2) atoms. Co(1) is bonded in a 2-coordinate geometry to one B(1) and one B(2) atom. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to one Rh(3), one Rh(5), two equivalent Rh(2), and two equivalent Co(1) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(2), one Rh(4), one Rh(5), one Rh(9), and one Co(1) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(6), two equivalent Rh(4), and two equivalent Rh(8) atoms. In the fourth B site, B(4) is bonded in a 6-coordinate geometry to one Rh(2), one Rh(3), one Rh(4), one Rh(6), one Rh(7), and one Rh(8) atom.
Co(Rh2B)3 crystallizes in the monoclinic Cm space group. There are nine inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 3-coordinate geometry to one B(3) and two equivalent B(2) atoms. The Rh(1)-B(3) bond length is 2.09 Å. Both Rh(1)-B(2) bond lengths are 2.19 Å. In the second Rh site, Rh(2) is bonded in a 3-coordinate geometry to one B(1), one B(2), and one B(4) atom. The Rh(2)-B(1) bond length is 2.17 Å. The Rh(2)-B(2) bond length is 2.24 Å. The Rh(2)-B(4) bond length is 2.10 Å. In the third Rh site, Rh(3) is bonded in a 3-coordinate geometry to one B(1) and two equivalent B(4) atoms. The Rh(3)-B(1) bond length is 2.15 Å. Both Rh(3)-B(4) bond lengths are 2.21 Å. In the fourth Rh site, Rh(4) is bonded in a 3-coordinate geometry to one B(2), one B(3), and one B(4) atom. The Rh(4)-B(2) bond length is 2.12 Å. The Rh(4)-B(3) bond length is 2.20 Å. The Rh(4)-B(4) bond length is 2.23 Å. In the fifth Rh site, Rh(5) is bonded in a 3-coordinate geometry to one B(1) and two equivalent B(2) atoms. The Rh(5)-B(1) bond length is 2.18 Å. Both Rh(5)-B(2) bond lengths are 2.19 Å. In the sixth Rh site, Rh(6) is bonded in a 3-coordinate geometry to one B(3) and two equivalent B(4) atoms. The Rh(6)-B(3) bond length is 2.15 Å. Both Rh(6)-B(4) bond lengths are 2.16 Å. In the seventh Rh site, Rh(7) is bonded in a distorted water-like geometry to two equivalent B(4) atoms. Both Rh(7)-B(4) bond lengths are 2.12 Å. In the eighth Rh site, Rh(8) is bonded in a 2-coordinate geometry to one B(3) and one B(4) atom. The Rh(8)-B(3) bond length is 2.15 Å. The Rh(8)-B(4) bond length is 2.16 Å. In the ninth Rh site, Rh(9) is bonded in a distorted water-like geometry to two equivalent B(2) atoms. Both Rh(9)-B(2) bond lengths are 2.12 Å. Co(1) is bonded in a 2-coordinate geometry to one B(1) and one B(2) atom. The Co(1)-B(1) bond length is 2.10 Å. The Co(1)-B(2) bond length is 2.13 Å. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 6-coordinate geometry to one Rh(3), one Rh(5), two equivalent Rh(2), and two equivalent Co(1) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(2), one Rh(4), one Rh(5), one Rh(9), and one Co(1) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(6), two equivalent Rh(4), and two equivalent Rh(8) atoms. In the fourth B site, B(4) is bonded in a 6-coordinate geometry to one Rh(2), one Rh(3), one Rh(4), one Rh(6), one Rh(7), and one Rh(8) atom.