Th11Ru12C18 crystallizes in the cubic I-43m space group. There are three inequivalent Th sites. In the first Th site, Th(1) is bonded in a 6-coordinate geometry to six equivalent C(2) atoms. In the second Th site, Th(2) is bonded in a 8-coordinate geometry to four equivalent C(1) and four equivalent C(2) atoms. In the third Th site, Th(3) is bonded in a 12-coordinate geometry to twelve equivalent Ru(1) atoms. Ru(1) is bonded in a distorted trigonal non-coplanar geometry to one Th(3), one C(1), and two equivalent C(2) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 7-coordinate geometry to four equivalent Th(2), two equivalent Ru(1), and one C(1) atom. In the second C site, C(2) is bonded to two equivalent Th(1), two equivalent Th(2), and two equivalent Ru(1) atoms to form a mixture of corner and edge-sharing CTh4Ru2 octahedra. The corner-sharing octahedral tilt angles range from 5-68°.
Th11Ru12C18 crystallizes in the cubic I-43m space group. There are three inequivalent Th sites. In the first Th site, Th(1) is bonded in a 6-coordinate geometry to six equivalent C(2) atoms. There are three shorter (2.74 Å) and three longer (2.86 Å) Th(1)-C(2) bond lengths. In the second Th site, Th(2) is bonded in a 8-coordinate geometry to four equivalent C(1) and four equivalent C(2) atoms. All Th(2)-C(1) bond lengths are 2.79 Å. All Th(2)-C(2) bond lengths are 2.63 Å. In the third Th site, Th(3) is bonded in a 12-coordinate geometry to twelve equivalent Ru(1) atoms. All Th(3)-Ru(1) bond lengths are 3.32 Å. Ru(1) is bonded in a distorted trigonal non-coplanar geometry to one Th(3), one C(1), and two equivalent C(2) atoms. The Ru(1)-C(1) bond length is 2.08 Å. Both Ru(1)-C(2) bond lengths are 1.96 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 7-coordinate geometry to four equivalent Th(2), two equivalent Ru(1), and one C(1) atom. The C(1)-C(1) bond length is 1.42 Å. In the second C site, C(2) is bonded to two equivalent Th(1), two equivalent Th(2), and two equivalent Ru(1) atoms to form a mixture of corner and edge-sharing CTh4Ru2 octahedra. The corner-sharing octahedral tilt angles range from 5-68°.