Pu2W2C3 crystallizes in the monoclinic C2/m space group. Pu(1) is bonded to two equivalent C(2) and three equivalent C(1) atoms to form a mixture of distorted corner and edge-sharing PuC5 square pyramids. W(1) is bonded in a 4-coordinate geometry to one C(2) and three equivalent C(1) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded to three equivalent Pu(1) and three equivalent W(1) atoms to form CPu3W3 octahedra that share corners with three equivalent C(2)Pu4W2 octahedra, edges with three equivalent C(2)Pu4W2 octahedra, and edges with six equivalent C(1)Pu3W3 octahedra. The corner-sharing octahedral tilt angles range from 15-29°. In the second C site, C(2) is bonded to four equivalent Pu(1) and two equivalent W(1) atoms to form CPu4W2 octahedra that share corners with six equivalent C(1)Pu3W3 octahedra, edges with two equivalent C(2)Pu4W2 octahedra, and edges with six equivalent C(1)Pu3W3 octahedra. The corner-sharing octahedral tilt angles range from 15-29°.
Pu2W2C3 crystallizes in the monoclinic C2/m space group. Pu(1) is bonded to two equivalent C(2) and three equivalent C(1) atoms to form a mixture of distorted corner and edge-sharing PuC5 square pyramids. Both Pu(1)-C(2) bond lengths are 2.56 Å. There is one shorter (2.44 Å) and two longer (2.52 Å) Pu(1)-C(1) bond lengths. W(1) is bonded in a 4-coordinate geometry to one C(2) and three equivalent C(1) atoms. The W(1)-C(2) bond length is 2.05 Å. There are two shorter (2.11 Å) and one longer (2.19 Å) W(1)-C(1) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded to three equivalent Pu(1) and three equivalent W(1) atoms to form CPu3W3 octahedra that share corners with three equivalent C(2)Pu4W2 octahedra, edges with three equivalent C(2)Pu4W2 octahedra, and edges with six equivalent C(1)Pu3W3 octahedra. The corner-sharing octahedral tilt angles range from 15-29°. In the second C site, C(2) is bonded to four equivalent Pu(1) and two equivalent W(1) atoms to form CPu4W2 octahedra that share corners with six equivalent C(1)Pu3W3 octahedra, edges with two equivalent C(2)Pu4W2 octahedra, and edges with six equivalent C(1)Pu3W3 octahedra. The corner-sharing octahedral tilt angles range from 15-29°.