TbWC2 crystallizes in the orthorhombic Pnma space group. Tb(1) is bonded to three equivalent C(2) and four equivalent C(1) atoms to form distorted TbC7 pentagonal bipyramids that share corners with four equivalent Tb(1)C7 pentagonal bipyramids, corners with three equivalent W(1)C5 trigonal bipyramids, edges with four equivalent Tb(1)C7 pentagonal bipyramids, edges with seven equivalent W(1)C5 trigonal bipyramids, and faces with two equivalent Tb(1)C7 pentagonal bipyramids. W(1) is bonded to two equivalent C(1) and three equivalent C(2) atoms to form WC5 trigonal bipyramids that share corners with three equivalent Tb(1)C7 pentagonal bipyramids, corners with four equivalent W(1)C5 trigonal bipyramids, edges with seven equivalent Tb(1)C7 pentagonal bipyramids, and edges with two equivalent W(1)C5 trigonal bipyramids. There are two inequivalent C sites. In the first C site, C(1) is bonded to four equivalent Tb(1) and two equivalent W(1) atoms to form CTb4W2 octahedra that share corners with four equivalent C(1)Tb4W2 octahedra, corners with nine equivalent C(2)Tb3W3 octahedra, edges with two equivalent C(1)Tb4W2 octahedra, edges with three equivalent C(2)Tb3W3 octahedra,  a faceface with one C(2)Tb3W3 octahedra, and faces with two equivalent C(1)Tb4W2 octahedra. The corner-sharing octahedral tilt angles range from 9-60°. In the second C site, C(2) is bonded to three equivalent Tb(1) and three equivalent W(1) atoms to form CTb3W3 octahedra that share corners with nine equivalent C(1)Tb4W2 octahedra, edges with three equivalent C(1)Tb4W2 octahedra, edges with six equivalent C(2)Tb3W3 octahedra, and  a faceface with one C(1)Tb4W2 octahedra. The corner-sharing octahedral tilt angles range from 9-60°.
TbWC2 crystallizes in the orthorhombic Pnma space group. Tb(1) is bonded to three equivalent C(2) and four equivalent C(1) atoms to form distorted TbC7 pentagonal bipyramids that share corners with four equivalent Tb(1)C7 pentagonal bipyramids, corners with three equivalent W(1)C5 trigonal bipyramids, edges with four equivalent Tb(1)C7 pentagonal bipyramids, edges with seven equivalent W(1)C5 trigonal bipyramids, and faces with two equivalent Tb(1)C7 pentagonal bipyramids. There is one shorter (2.46 Å) and two longer (2.64 Å) Tb(1)-C(2) bond lengths. There are two shorter (2.50 Å) and two longer (2.56 Å) Tb(1)-C(1) bond lengths. W(1) is bonded to two equivalent C(1) and three equivalent C(2) atoms to form WC5 trigonal bipyramids that share corners with three equivalent Tb(1)C7 pentagonal bipyramids, corners with four equivalent W(1)C5 trigonal bipyramids, edges with seven equivalent Tb(1)C7 pentagonal bipyramids, and edges with two equivalent W(1)C5 trigonal bipyramids. There is one shorter (2.03 Å) and one longer (2.12 Å) W(1)-C(1) bond length. There are two shorter (2.09 Å) and one longer (2.28 Å) W(1)-C(2) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded to four equivalent Tb(1) and two equivalent W(1) atoms to form CTb4W2 octahedra that share corners with four equivalent C(1)Tb4W2 octahedra, corners with nine equivalent C(2)Tb3W3 octahedra, edges with two equivalent C(1)Tb4W2 octahedra, edges with three equivalent C(2)Tb3W3 octahedra,  a faceface with one C(2)Tb3W3 octahedra, and faces with two equivalent C(1)Tb4W2 octahedra. The corner-sharing octahedral tilt angles range from 9-60°. In the second C site, C(2) is bonded to three equivalent Tb(1) and three equivalent W(1) atoms to form CTb3W3 octahedra that share corners with nine equivalent C(1)Tb4W2 octahedra, edges with three equivalent C(1)Tb4W2 octahedra, edges with six equivalent C(2)Tb3W3 octahedra, and  a faceface with one C(1)Tb4W2 octahedra. The corner-sharing octahedral tilt angles range from 9-60°.