Rh18B11 crystallizes in the triclinic P1 space group. There are eighteen inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to one B(3), one B(4), one B(7), and one B(8) atom to form distorted edge-sharing RhB4 tetrahedra. In the second Rh site, Rh(2) is bonded to one B(3), one B(4), one B(7), and one B(8) atom to form distorted edge-sharing RhB4 tetrahedra. In the third Rh site, Rh(3) is bonded in a 4-coordinate geometry to one B(10), one B(5), one B(7), and one B(8) atom. In the fourth Rh site, Rh(4) is bonded in a 4-coordinate geometry to one B(6), one B(7), one B(8), and one B(9) atom. In the fifth Rh site, Rh(5) is bonded in a 4-coordinate geometry to one B(10), one B(11), one B(4), and one B(5) atom. In the sixth Rh site, Rh(6) is bonded in a 3-coordinate geometry to one B(11), one B(3), one B(6), and one B(9) atom. In the seventh Rh site, Rh(7) is bonded in a 3-coordinate geometry to one B(1), one B(10), and one B(2) atom. In the eighth Rh site, Rh(8) is bonded in a 4-coordinate geometry to one B(1), one B(11), one B(2), and one B(9) atom. In the ninth Rh site, Rh(9) is bonded in a distorted water-like geometry to one B(10), one B(2), and one B(4) atom. In the tenth Rh site, Rh(10) is bonded in a distorted T-shaped geometry to one B(11), one B(3), and one B(9) atom. In the eleventh Rh site, Rh(11) is bonded in a 4-coordinate geometry to one B(5), one B(6), one B(7), and one B(9) atom. In the twelfth Rh site, Rh(12) is bonded in a 4-coordinate geometry to one B(10), one B(5), one B(6), and one B(8) atom. In the thirteenth Rh site, Rh(13) is bonded in a 5-coordinate geometry to one B(1), one B(2), one B(4), one B(5), and one B(7) atom. In the fourteenth Rh site, Rh(14) is bonded in a 5-coordinate geometry to one B(1), one B(2), one B(3), one B(6), and one B(8) atom. In the fifteenth Rh site, Rh(15) is bonded in a 5-coordinate geometry to one B(10), one B(2), one B(4), one B(5), and one B(7) atom. In the sixteenth Rh site, Rh(16) is bonded in a 5-coordinate geometry to one B(1), one B(3), one B(6), one B(8), and one B(9) atom. In the seventeenth Rh site, Rh(17) is bonded in a 4-coordinate geometry to one B(1), one B(10), one B(11), one B(2), and one B(5) atom. In the eighteenth Rh site, Rh(18) is bonded in a 3-coordinate geometry to one B(1), one B(11), one B(2), one B(6), and one B(9) atom. There are eleven inequivalent B sites. In the first B site, B(1) is bonded in a 8-coordinate geometry to one Rh(13), one Rh(14), one Rh(16), one Rh(17), one Rh(18), one Rh(7), one Rh(8), and one B(2) atom. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Rh(13), one Rh(14), one Rh(15), one Rh(17), one Rh(18), one Rh(7), one Rh(8), one Rh(9), and one B(1) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(10), one Rh(14), one Rh(16), one Rh(2), and one Rh(6) atom. In the fourth B site, B(4) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(13), one Rh(15), one Rh(2), one Rh(5), and one Rh(9) atom. In the fifth B site, B(5) is bonded in a 8-coordinate geometry to one Rh(11), one Rh(12), one Rh(13), one Rh(15), one Rh(17), one Rh(3), one Rh(5), and one B(10) atom. In the sixth B site, B(6) is bonded in a 8-coordinate geometry to one Rh(11), one Rh(12), one Rh(14), one Rh(16), one Rh(18), one Rh(4), one Rh(6), and one B(9) atom. In the seventh B site, B(7) is bonded in a 7-coordinate geometry to one Rh(1), one Rh(11), one Rh(13), one Rh(15), one Rh(2), one Rh(3), and one Rh(4) atom. In the eighth B site, B(8) is bonded in a 7-coordinate geometry to one Rh(1), one Rh(12), one Rh(14), one Rh(16), one Rh(2), one Rh(3), and one Rh(4) atom. In the ninth B site, B(9) is bonded in a 9-coordinate geometry to one Rh(10), one Rh(11), one Rh(16), one Rh(18), one Rh(4), one Rh(6), one Rh(8), one B(11), and one B(6) atom. In the tenth B site, B(10) is bonded in a 8-coordinate geometry to one Rh(12), one Rh(15), one Rh(17), one Rh(3), one Rh(5), one Rh(7), one Rh(9), and one B(5) atom. In the eleventh B site, B(11) is bonded in a 7-coordinate geometry to one Rh(10), one Rh(17), one Rh(18), one Rh(5), one Rh(6), one Rh(8), and one B(9) atom.
Rh18B11 crystallizes in the triclinic P1 space group. There are eighteen inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to one B(3), one B(4), one B(7), and one B(8) atom to form distorted edge-sharing RhB4 tetrahedra. The Rh(1)-B(3) bond length is 2.13 Å. The Rh(1)-B(4) bond length is 2.26 Å. The Rh(1)-B(7) bond length is 2.20 Å. The Rh(1)-B(8) bond length is 2.22 Å. In the second Rh site, Rh(2) is bonded to one B(3), one B(4), one B(7), and one B(8) atom to form distorted edge-sharing RhB4 tetrahedra. The Rh(2)-B(3) bond length is 2.20 Å. The Rh(2)-B(4) bond length is 2.14 Å. The Rh(2)-B(7) bond length is 2.23 Å. The Rh(2)-B(8) bond length is 2.21 Å. In the third Rh site, Rh(3) is bonded in a 4-coordinate geometry to one B(10), one B(5), one B(7), and one B(8) atom. The Rh(3)-B(10) bond length is 2.26 Å. The Rh(3)-B(5) bond length is 2.14 Å. The Rh(3)-B(7) bond length is 2.43 Å. The Rh(3)-B(8) bond length is 2.14 Å. In the fourth Rh site, Rh(4) is bonded in a 4-coordinate geometry to one B(6), one B(7), one B(8), and one B(9) atom. The Rh(4)-B(6) bond length is 2.13 Å. The Rh(4)-B(7) bond length is 2.14 Å. The Rh(4)-B(8) bond length is 2.45 Å. The Rh(4)-B(9) bond length is 2.26 Å. In the fifth Rh site, Rh(5) is bonded in a 4-coordinate geometry to one B(10), one B(11), one B(4), and one B(5) atom. The Rh(5)-B(10) bond length is 2.37 Å. The Rh(5)-B(11) bond length is 2.03 Å. The Rh(5)-B(4) bond length is 2.09 Å. The Rh(5)-B(5) bond length is 2.24 Å. In the sixth Rh site, Rh(6) is bonded in a 3-coordinate geometry to one B(11), one B(3), one B(6), and one B(9) atom. The Rh(6)-B(11) bond length is 2.16 Å. The Rh(6)-B(3) bond length is 2.11 Å. The Rh(6)-B(6) bond length is 2.26 Å. The Rh(6)-B(9) bond length is 2.38 Å. In the seventh Rh site, Rh(7) is bonded in a 3-coordinate geometry to one B(1), one B(10), and one B(2) atom. The Rh(7)-B(1) bond length is 2.20 Å. The Rh(7)-B(10) bond length is 2.21 Å. The Rh(7)-B(2) bond length is 2.12 Å. In the eighth Rh site, Rh(8) is bonded in a 4-coordinate geometry to one B(1), one B(11), one B(2), and one B(9) atom. The Rh(8)-B(1) bond length is 2.15 Å. The Rh(8)-B(11) bond length is 2.25 Å. The Rh(8)-B(2) bond length is 2.16 Å. The Rh(8)-B(9) bond length is 2.24 Å. In the ninth Rh site, Rh(9) is bonded in a distorted water-like geometry to one B(10), one B(2), and one B(4) atom. The Rh(9)-B(10) bond length is 2.05 Å. The Rh(9)-B(2) bond length is 2.84 Å. The Rh(9)-B(4) bond length is 2.15 Å. In the tenth Rh site, Rh(10) is bonded in a distorted T-shaped geometry to one B(11), one B(3), and one B(9) atom. The Rh(10)-B(11) bond length is 2.08 Å. The Rh(10)-B(3) bond length is 2.22 Å. The Rh(10)-B(9) bond length is 2.15 Å. In the eleventh Rh site, Rh(11) is bonded in a 4-coordinate geometry to one B(5), one B(6), one B(7), and one B(9) atom. The Rh(11)-B(5) bond length is 2.41 Å. The Rh(11)-B(6) bond length is 2.21 Å. The Rh(11)-B(7) bond length is 2.16 Å. The Rh(11)-B(9) bond length is 2.16 Å. In the twelfth Rh site, Rh(12) is bonded in a 4-coordinate geometry to one B(10), one B(5), one B(6), and one B(8) atom. The Rh(12)-B(10) bond length is 2.21 Å. The Rh(12)-B(5) bond length is 2.18 Å. The Rh(12)-B(6) bond length is 2.45 Å. The Rh(12)-B(8) bond length is 2.16 Å. In the thirteenth Rh site, Rh(13) is bonded in a 5-coordinate geometry to one B(1), one B(2), one B(4), one B(5), and one B(7) atom. The Rh(13)-B(1) bond length is 2.28 Å. The Rh(13)-B(2) bond length is 2.41 Å. The Rh(13)-B(4) bond length is 2.14 Å. The Rh(13)-B(5) bond length is 2.14 Å. The Rh(13)-B(7) bond length is 2.23 Å. In the fourteenth Rh site, Rh(14) is bonded in a 5-coordinate geometry to one B(1), one B(2), one B(3), one B(6), and one B(8) atom. The Rh(14)-B(1) bond length is 2.50 Å. The Rh(14)-B(2) bond length is 2.36 Å. The Rh(14)-B(3) bond length is 2.15 Å. The Rh(14)-B(6) bond length is 2.15 Å. The Rh(14)-B(8) bond length is 2.22 Å. In the fifteenth Rh site, Rh(15) is bonded in a 5-coordinate geometry to one B(10), one B(2), one B(4), one B(5), and one B(7) atom. The Rh(15)-B(10) bond length is 2.19 Å. The Rh(15)-B(2) bond length is 2.09 Å. The Rh(15)-B(4) bond length is 2.19 Å. The Rh(15)-B(5) bond length is 2.25 Å. The Rh(15)-B(7) bond length is 2.15 Å. In the sixteenth Rh site, Rh(16) is bonded in a 5-coordinate geometry to one B(1), one B(3), one B(6), one B(8), and one B(9) atom. The Rh(16)-B(1) bond length is 2.11 Å. The Rh(16)-B(3) bond length is 2.18 Å. The Rh(16)-B(6) bond length is 2.27 Å. The Rh(16)-B(8) bond length is 2.15 Å. The Rh(16)-B(9) bond length is 2.19 Å. In the seventeenth Rh site, Rh(17) is bonded in a 4-coordinate geometry to one B(1), one B(10), one B(11), one B(2), and one B(5) atom. The Rh(17)-B(1) bond length is 2.14 Å. The Rh(17)-B(10) bond length is 2.33 Å. The Rh(17)-B(11) bond length is 2.16 Å. The Rh(17)-B(2) bond length is 2.76 Å. The Rh(17)-B(5) bond length is 2.27 Å. In the eighteenth Rh site, Rh(18) is bonded in a 3-coordinate geometry to one B(1), one B(11), one B(2), one B(6), and one B(9) atom. The Rh(18)-B(1) bond length is 2.57 Å. The Rh(18)-B(11) bond length is 2.25 Å. The Rh(18)-B(2) bond length is 2.16 Å. The Rh(18)-B(6) bond length is 2.27 Å. The Rh(18)-B(9) bond length is 2.37 Å. There are eleven inequivalent B sites. In the first B site, B(1) is bonded in a 8-coordinate geometry to one Rh(13), one Rh(14), one Rh(16), one Rh(17), one Rh(18), one Rh(7), one Rh(8), and one B(2) atom. The B(1)-B(2) bond length is 1.89 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to one Rh(13), one Rh(14), one Rh(15), one Rh(17), one Rh(18), one Rh(7), one Rh(8), one Rh(9), and one B(1) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(10), one Rh(14), one Rh(16), one Rh(2), and one Rh(6) atom. In the fourth B site, B(4) is bonded in a 6-coordinate geometry to one Rh(1), one Rh(13), one Rh(15), one Rh(2), one Rh(5), and one Rh(9) atom. In the fifth B site, B(5) is bonded in a 8-coordinate geometry to one Rh(11), one Rh(12), one Rh(13), one Rh(15), one Rh(17), one Rh(3), one Rh(5), and one B(10) atom. The B(5)-B(10) bond length is 1.93 Å. In the sixth B site, B(6) is bonded in a 8-coordinate geometry to one Rh(11), one Rh(12), one Rh(14), one Rh(16), one Rh(18), one Rh(4), one Rh(6), and one B(9) atom. The B(6)-B(9) bond length is 1.91 Å. In the seventh B site, B(7) is bonded in a 7-coordinate geometry to one Rh(1), one Rh(11), one Rh(13), one Rh(15), one Rh(2), one Rh(3), and one Rh(4) atom. In the eighth B site, B(8) is bonded in a 7-coordinate geometry to one Rh(1), one Rh(12), one Rh(14), one Rh(16), one Rh(2), one Rh(3), and one Rh(4) atom. In the ninth B site, B(9) is bonded in a 9-coordinate geometry to one Rh(10), one Rh(11), one Rh(16), one Rh(18), one Rh(4), one Rh(6), one Rh(8), one B(11), and one B(6) atom. The B(9)-B(11) bond length is 1.90 Å. In the tenth B site, B(10) is bonded in a 8-coordinate geometry to one Rh(12), one Rh(15), one Rh(17), one Rh(3), one Rh(5), one Rh(7), one Rh(9), and one B(5) atom. In the eleventh B site, B(11) is bonded in a 7-coordinate geometry to one Rh(10), one Rh(17), one Rh(18), one Rh(5), one Rh(6), one Rh(8), and one B(9) atom.