UTaC2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. U(1) is bonded to six equivalent C(1) atoms to form UC6 octahedra that share corners with six equivalent Ta(1)C6 octahedra, edges with six equivalent U(1)C6 octahedra, and edges with six equivalent Ta(1)C6 octahedra. The corner-sharing octahedral tilt angles are 6°. Ta(1) is bonded to six equivalent C(1) atoms to form TaC6 octahedra that share corners with six equivalent U(1)C6 octahedra, edges with six equivalent U(1)C6 octahedra, and edges with six equivalent Ta(1)C6 octahedra. The corner-sharing octahedral tilt angles are 6°. C(1) is bonded to three equivalent U(1) and three equivalent Ta(1) atoms to form a mixture of corner and edge-sharing CU3Ta3 octahedra. The corner-sharing octahedra are not tilted.
UTaC2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. U(1) is bonded to six equivalent C(1) atoms to form UC6 octahedra that share corners with six equivalent Ta(1)C6 octahedra, edges with six equivalent U(1)C6 octahedra, and edges with six equivalent Ta(1)C6 octahedra. The corner-sharing octahedral tilt angles are 6°. All U(1)-C(1) bond lengths are 2.43 Å. Ta(1) is bonded to six equivalent C(1) atoms to form TaC6 octahedra that share corners with six equivalent U(1)C6 octahedra, edges with six equivalent U(1)C6 octahedra, and edges with six equivalent Ta(1)C6 octahedra. The corner-sharing octahedral tilt angles are 6°. All Ta(1)-C(1) bond lengths are 2.26 Å. C(1) is bonded to three equivalent U(1) and three equivalent Ta(1) atoms to form a mixture of corner and edge-sharing CU3Ta3 octahedra. The corner-sharing octahedra are not tilted.