ThB2C crystallizes in the trigonal R-3m space group. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a 3-coordinate geometry to three equivalent C(1) atoms. In the second Th site, Th(2) is bonded in a 6-coordinate geometry to six equivalent C(1) atoms. B(1) is bonded in a distorted single-bond geometry to one C(1) atom. C(1) is bonded in a distorted linear geometry to two equivalent Th(1), two equivalent Th(2), and two equivalent B(1) atoms.
ThB2C crystallizes in the trigonal R-3m space group. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a 3-coordinate geometry to three equivalent C(1) atoms. All Th(1)-C(1) bond lengths are 2.58 Å. In the second Th site, Th(2) is bonded in a 6-coordinate geometry to six equivalent C(1) atoms. All Th(2)-C(1) bond lengths are 2.72 Å. B(1) is bonded in a distorted single-bond geometry to one C(1) atom. The B(1)-C(1) bond length is 1.50 Å. C(1) is bonded in a distorted linear geometry to two equivalent Th(1), two equivalent Th(2), and two equivalent B(1) atoms.