UW4C4 crystallizes in the tetragonal P4/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to eight equivalent C(1) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to eight equivalent C(2) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent C(1) and two equivalent C(2) atoms to form corner-sharing WC4 trigonal pyramids. In the second W site, W(2) is bonded in a rectangular see-saw-like geometry to two equivalent C(1) and two equivalent C(2) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded to two equivalent U(1), two equivalent W(1), and two equivalent W(2) atoms to form a mixture of edge, face, and corner-sharing CU2W4 octahedra. The corner-sharing octahedral tilt angles range from 0-67°. In the second C site, C(2) is bonded to two equivalent U(2), two equivalent W(1), and two equivalent W(2) atoms to form a mixture of edge, face, and corner-sharing CU2W4 octahedra. The corner-sharing octahedral tilt angles range from 0-68°.
UW4C4 crystallizes in the tetragonal P4/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to eight equivalent C(1) atoms. All U(1)-C(1) bond lengths are 2.50 Å. In the second U site, U(2) is bonded in a body-centered cubic geometry to eight equivalent C(2) atoms. All U(2)-C(2) bond lengths are 2.54 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to two equivalent C(1) and two equivalent C(2) atoms to form corner-sharing WC4 trigonal pyramids. Both W(1)-C(1) bond lengths are 2.12 Å. There is one shorter (2.10 Å) and one longer (2.11 Å) W(1)-C(2) bond length. In the second W site, W(2) is bonded in a rectangular see-saw-like geometry to two equivalent C(1) and two equivalent C(2) atoms. There is one shorter (2.15 Å) and one longer (2.17 Å) W(2)-C(1) bond length. Both W(2)-C(2) bond lengths are 2.14 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded to two equivalent U(1), two equivalent W(1), and two equivalent W(2) atoms to form a mixture of edge, face, and corner-sharing CU2W4 octahedra. The corner-sharing octahedral tilt angles range from 0-67°. In the second C site, C(2) is bonded to two equivalent U(2), two equivalent W(1), and two equivalent W(2) atoms to form a mixture of edge, face, and corner-sharing CU2W4 octahedra. The corner-sharing octahedral tilt angles range from 0-68°.