TaNbC2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Ta(1) is bonded to six equivalent C(1) atoms to form TaC6 octahedra that share corners with six equivalent Nb(1)C6 octahedra, edges with six equivalent Ta(1)C6 octahedra, and edges with six equivalent Nb(1)C6 octahedra. The corner-sharing octahedral tilt angles are 2°. Nb(1) is bonded to six equivalent C(1) atoms to form NbC6 octahedra that share corners with six equivalent Ta(1)C6 octahedra, edges with six equivalent Ta(1)C6 octahedra, and edges with six equivalent Nb(1)C6 octahedra. The corner-sharing octahedral tilt angles are 2°. C(1) is bonded to three equivalent Ta(1) and three equivalent Nb(1) atoms to form a mixture of edge and corner-sharing CTa3Nb3 octahedra. The corner-sharing octahedra are not tilted.
TaNbC2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. Ta(1) is bonded to six equivalent C(1) atoms to form TaC6 octahedra that share corners with six equivalent Nb(1)C6 octahedra, edges with six equivalent Ta(1)C6 octahedra, and edges with six equivalent Nb(1)C6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Ta(1)-C(1) bond lengths are 2.22 Å. Nb(1) is bonded to six equivalent C(1) atoms to form NbC6 octahedra that share corners with six equivalent Ta(1)C6 octahedra, edges with six equivalent Ta(1)C6 octahedra, and edges with six equivalent Nb(1)C6 octahedra. The corner-sharing octahedral tilt angles are 2°. All Nb(1)-C(1) bond lengths are 2.27 Å. C(1) is bonded to three equivalent Ta(1) and three equivalent Nb(1) atoms to form a mixture of edge and corner-sharing CTa3Nb3 octahedra. The corner-sharing octahedra are not tilted.