Dy2Mo2C3 crystallizes in the monoclinic C2/m space group. Dy(1) is bonded to two equivalent C(2) and three equivalent C(1) atoms to form a mixture of edge and corner-sharing DyC5 square pyramids. Mo(1) is bonded in a distorted see-saw-like 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 Dy(1) and three equivalent Mo(1) atoms to form CDy3Mo3 octahedra that share corners with three equivalent C(2)Dy4Mo2 octahedra, edges with three equivalent C(2)Dy4Mo2 octahedra, and edges with six equivalent C(1)Dy3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 11-28°. In the second C site, C(2) is bonded to four equivalent Dy(1) and two equivalent Mo(1) atoms to form CDy4Mo2 octahedra that share corners with six equivalent C(1)Dy3Mo3 octahedra, edges with two equivalent C(2)Dy4Mo2 octahedra, and edges with six equivalent C(1)Dy3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 11-28°.
Dy2Mo2C3 crystallizes in the monoclinic C2/m space group. Dy(1) is bonded to two equivalent C(2) and three equivalent C(1) atoms to form a mixture of edge and corner-sharing DyC5 square pyramids. Both Dy(1)-C(2) bond lengths are 2.54 Å. There is one shorter (2.44 Å) and two longer (2.52 Å) Dy(1)-C(1) bond lengths. Mo(1) is bonded in a distorted see-saw-like geometry to one C(2) and three equivalent C(1) atoms. The Mo(1)-C(2) bond length is 2.06 Å. There are two shorter (2.09 Å) and one longer (2.16 Å) Mo(1)-C(1) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded to three equivalent Dy(1) and three equivalent Mo(1) atoms to form CDy3Mo3 octahedra that share corners with three equivalent C(2)Dy4Mo2 octahedra, edges with three equivalent C(2)Dy4Mo2 octahedra, and edges with six equivalent C(1)Dy3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 11-28°. In the second C site, C(2) is bonded to four equivalent Dy(1) and two equivalent Mo(1) atoms to form CDy4Mo2 octahedra that share corners with six equivalent C(1)Dy3Mo3 octahedra, edges with two equivalent C(2)Dy4Mo2 octahedra, and edges with six equivalent C(1)Dy3Mo3 octahedra. The corner-sharing octahedral tilt angles range from 11-28°.