UB2C crystallizes in the trigonal R-3m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 3-coordinate geometry to three equivalent C(1) atoms. In the second U site, U(2) is bonded to six equivalent C(1) atoms to form distorted corner-sharing UC6 octahedra. The corner-sharing octahedra are not tilted. B(1) is bonded in a distorted single-bond geometry to one C(1) atom. C(1) is bonded to two equivalent U(1), two equivalent U(2), and two equivalent B(1) atoms to form a mixture of distorted edge and corner-sharing CU4B2 octahedra. The corner-sharing octahedral tilt angles range from 0-78°.
UB2C crystallizes in the trigonal R-3m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 3-coordinate geometry to three equivalent C(1) atoms. All U(1)-C(1) bond lengths are 2.44 Å. In the second U site, U(2) is bonded to six equivalent C(1) atoms to form distorted corner-sharing UC6 octahedra. The corner-sharing octahedra are not tilted. All U(2)-C(1) bond lengths are 2.60 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 to two equivalent U(1), two equivalent U(2), and two equivalent B(1) atoms to form a mixture of distorted edge and corner-sharing CU4B2 octahedra. The corner-sharing octahedral tilt angles range from 0-78°.