Ce2Mo2C3 crystallizes in the monoclinic C2/m space group. Ce(1) is bonded to two equivalent C(1) and three equivalent C(2) atoms to form distorted CeC5 square pyramids that share corners with two equivalent Ce(1)C5 square pyramids, corners with seven equivalent Mo(1)C4 tetrahedra, edges with five equivalent Ce(1)C5 square pyramids, and edges with three equivalent Mo(1)C4 tetrahedra. Mo(1) is bonded to one C(1) and three equivalent C(2) atoms to form distorted MoC4 tetrahedra that share corners with seven equivalent Ce(1)C5 square pyramids, corners with three equivalent Mo(1)C4 tetrahedra, edges with three equivalent Ce(1)C5 square pyramids, and edges with two equivalent Mo(1)C4 tetrahedra. There are two inequivalent C sites. In the first C site, C(1) is bonded to four equivalent Ce(1) and two equivalent Mo(1) atoms to form CCe4Mo2 octahedra that share corners with six equivalent C(2)Ce3Mo3 octahedra, edges with two equivalent C(1)Ce4Mo2 octahedra, and edges with six equivalent C(2)Ce3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 16-31°. In the second C site, C(2) is bonded to three equivalent Ce(1) and three equivalent Mo(1) atoms to form CCe3Mo3 octahedra that share corners with three equivalent C(1)Ce4Mo2 octahedra, edges with three equivalent C(1)Ce4Mo2 octahedra, and edges with six equivalent C(2)Ce3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 16-31°.
Ce2Mo2C3 crystallizes in the monoclinic C2/m space group. Ce(1) is bonded to two equivalent C(1) and three equivalent C(2) atoms to form distorted CeC5 square pyramids that share corners with two equivalent Ce(1)C5 square pyramids, corners with seven equivalent Mo(1)C4 tetrahedra, edges with five equivalent Ce(1)C5 square pyramids, and edges with three equivalent Mo(1)C4 tetrahedra. Both Ce(1)-C(1) bond lengths are 2.62 Å. There is one shorter (2.47 Å) and two longer (2.61 Å) Ce(1)-C(2) bond lengths. Mo(1) is bonded to one C(1) and three equivalent C(2) atoms to form distorted MoC4 tetrahedra that share corners with seven equivalent Ce(1)C5 square pyramids, corners with three equivalent Mo(1)C4 tetrahedra, edges with three equivalent Ce(1)C5 square pyramids, and edges with two equivalent Mo(1)C4 tetrahedra. The Mo(1)-C(1) bond length is 2.04 Å. There are two shorter (2.10 Å) and one longer (2.16 Å) Mo(1)-C(2) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded to four equivalent Ce(1) and two equivalent Mo(1) atoms to form CCe4Mo2 octahedra that share corners with six equivalent C(2)Ce3Mo3 octahedra, edges with two equivalent C(1)Ce4Mo2 octahedra, and edges with six equivalent C(2)Ce3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 16-31°. In the second C site, C(2) is bonded to three equivalent Ce(1) and three equivalent Mo(1) atoms to form CCe3Mo3 octahedra that share corners with three equivalent C(1)Ce4Mo2 octahedra, edges with three equivalent C(1)Ce4Mo2 octahedra, and edges with six equivalent C(2)Ce3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 16-31°.