Tb8Rh5C12 crystallizes in the monoclinic C2/m space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 5-coordinate geometry to two equivalent C(3), two equivalent C(4), and three equivalent C(6) atoms. In the second Tb site, Tb(2) is bonded in a 11-coordinate geometry to two equivalent Rh(2), two equivalent C(3), two equivalent C(5), two equivalent C(6), and three equivalent C(4) atoms. In the third Tb site, Tb(3) is bonded in a 8-coordinate geometry to two equivalent Rh(3), two equivalent C(1), two equivalent C(2), and two equivalent C(5) atoms. In the fourth Tb site, Tb(4) is bonded in a 10-coordinate geometry to two equivalent Rh(1), two equivalent Rh(2), two equivalent Rh(3), two equivalent C(1), and two equivalent C(2) atoms. There are three inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a distorted linear geometry to four equivalent Tb(4) and two equivalent C(1) atoms. In the second Rh site, Rh(2) is bonded in a 2-coordinate geometry to two equivalent Tb(2), two equivalent Tb(4), one C(2), and one C(3) atom. In the third Rh site, Rh(3) is bonded in a 6-coordinate geometry to two equivalent Tb(3), two equivalent Tb(4), one C(3), and one C(5) atom. There are six inequivalent C sites. In the first C site, C(4) is bonded to two equivalent Tb(1), three equivalent Tb(2), and one C(3) atom to form a mixture of distorted corner and edge-sharing CTb5C octahedra. The corner-sharing octahedral tilt angles range from 7-15°. In the second C site, C(5) is bonded in a 4-coordinate geometry to two equivalent Tb(2), two equivalent Tb(3), one Rh(3), and one C(6) atom. In the third C site, C(6) is bonded to two equivalent Tb(2), three equivalent Tb(1), and one C(5) atom to form a mixture of corner and edge-sharing CTb5C octahedra. The corner-sharing octahedral tilt angles range from 7-15°. In the fourth C site, C(1) is bonded to two equivalent Tb(3), two equivalent Tb(4), one Rh(1), and one C(2) atom to form a mixture of corner and edge-sharing CTb4RhC octahedra. The corner-sharing octahedra are not tilted. In the fifth C site, C(2) is bonded in a 6-coordinate geometry to two equivalent Tb(3), two equivalent Tb(4), one Rh(2), and one C(1) atom. In the sixth C site, C(3) is bonded in a 7-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), one Rh(2), one Rh(3), and one C(4) atom.
Tb8Rh5C12 crystallizes in the monoclinic C2/m space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 5-coordinate geometry to two equivalent C(3), two equivalent C(4), and three equivalent C(6) atoms. Both Tb(1)-C(3) bond lengths are 2.75 Å. Both Tb(1)-C(4) bond lengths are 2.58 Å. There is one shorter (2.43 Å) and two longer (2.57 Å) Tb(1)-C(6) bond lengths. In the second Tb site, Tb(2) is bonded in a 11-coordinate geometry to two equivalent Rh(2), two equivalent C(3), two equivalent C(5), two equivalent C(6), and three equivalent C(4) atoms. Both Tb(2)-Rh(2) bond lengths are 3.16 Å. Both Tb(2)-C(3) bond lengths are 2.75 Å. Both Tb(2)-C(5) bond lengths are 2.95 Å. Both Tb(2)-C(6) bond lengths are 2.64 Å. There is one shorter (2.36 Å) and two longer (2.62 Å) Tb(2)-C(4) bond lengths. In the third Tb site, Tb(3) is bonded in a 8-coordinate geometry to two equivalent Rh(3), two equivalent C(1), two equivalent C(2), and two equivalent C(5) atoms. Both Tb(3)-Rh(3) bond lengths are 2.93 Å. Both Tb(3)-C(1) bond lengths are 2.60 Å. Both Tb(3)-C(2) bond lengths are 2.60 Å. Both Tb(3)-C(5) bond lengths are 2.68 Å. In the fourth Tb site, Tb(4) is bonded in a 10-coordinate geometry to two equivalent Rh(1), two equivalent Rh(2), two equivalent Rh(3), two equivalent C(1), and two equivalent C(2) atoms. Both Tb(4)-Rh(1) bond lengths are 3.08 Å. Both Tb(4)-Rh(2) bond lengths are 2.84 Å. Both Tb(4)-Rh(3) bond lengths are 2.99 Å. Both Tb(4)-C(1) bond lengths are 2.66 Å. Both Tb(4)-C(2) bond lengths are 2.97 Å. There are three inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a distorted linear geometry to four equivalent Tb(4) and two equivalent C(1) atoms. Both Rh(1)-C(1) bond lengths are 1.97 Å. In the second Rh site, Rh(2) is bonded in a 2-coordinate geometry to two equivalent Tb(2), two equivalent Tb(4), one C(2), and one C(3) atom. The Rh(2)-C(2) bond length is 2.01 Å. The Rh(2)-C(3) bond length is 2.01 Å. In the third Rh site, Rh(3) is bonded in a 6-coordinate geometry to two equivalent Tb(3), two equivalent Tb(4), one C(3), and one C(5) atom. The Rh(3)-C(3) bond length is 2.11 Å. The Rh(3)-C(5) bond length is 2.28 Å. There are six inequivalent C sites. In the first C site, C(4) is bonded to two equivalent Tb(1), three equivalent Tb(2), and one C(3) atom to form a mixture of distorted corner and edge-sharing CTb5C octahedra. The corner-sharing octahedral tilt angles range from 7-15°. The C(4)-C(3) bond length is 1.34 Å. In the second C site, C(5) is bonded in a 4-coordinate geometry to two equivalent Tb(2), two equivalent Tb(3), one Rh(3), and one C(6) atom. The C(5)-C(6) bond length is 1.35 Å. In the third C site, C(6) is bonded to two equivalent Tb(2), three equivalent Tb(1), and one C(5) atom to form a mixture of corner and edge-sharing CTb5C octahedra. The corner-sharing octahedral tilt angles range from 7-15°. In the fourth C site, C(1) is bonded to two equivalent Tb(3), two equivalent Tb(4), one Rh(1), and one C(2) atom to form a mixture of corner and edge-sharing CTb4RhC octahedra. The corner-sharing octahedra are not tilted. The C(1)-C(2) bond length is 1.30 Å. In the fifth C site, C(2) is bonded in a 6-coordinate geometry to two equivalent Tb(3), two equivalent Tb(4), one Rh(2), and one C(1) atom. In the sixth C site, C(3) is bonded in a 7-coordinate geometry to two equivalent Tb(1), two equivalent Tb(2), one Rh(2), one Rh(3), and one C(4) atom.