Dy2FeC4 crystallizes in the orthorhombic Ibam space group. Dy(1) is bonded in a 7-coordinate geometry to two equivalent C(2) and five equivalent C(1) atoms. Fe(1) is bonded to four equivalent C(2) atoms to form distorted FeC4 trigonal pyramids that share corners with four equivalent C(1)Dy5C octahedra and edges with two equivalent Fe(1)C4 trigonal pyramids. The corner-sharing octahedral tilt angles are 42°. There are two inequivalent C sites. In the first C site, C(1) is bonded to five equivalent Dy(1) and one C(2) atom to form distorted CDy5C octahedra that share corners with six equivalent C(1)Dy5C octahedra, corners with two equivalent Fe(1)C4 trigonal pyramids, and edges with seven equivalent C(1)Dy5C octahedra. The corner-sharing octahedral tilt angles range from 7-55°. In the second C site, C(2) is bonded in a 5-coordinate geometry to two equivalent Dy(1), two equivalent Fe(1), and one C(1) atom.
Dy2FeC4 crystallizes in the orthorhombic Ibam space group. Dy(1) is bonded in a 7-coordinate geometry to two equivalent C(2) and five equivalent C(1) atoms. There is one shorter (2.52 Å) and one longer (2.67 Å) Dy(1)-C(2) bond length. There are a spread of Dy(1)-C(1) bond distances ranging from 2.39-2.62 Å. Fe(1) is bonded to four equivalent C(2) atoms to form distorted FeC4 trigonal pyramids that share corners with four equivalent C(1)Dy5C octahedra and edges with two equivalent Fe(1)C4 trigonal pyramids. The corner-sharing octahedral tilt angles are 42°. All Fe(1)-C(2) bond lengths are 1.91 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded to five equivalent Dy(1) and one C(2) atom to form distorted CDy5C octahedra that share corners with six equivalent C(1)Dy5C octahedra, corners with two equivalent Fe(1)C4 trigonal pyramids, and edges with seven equivalent C(1)Dy5C octahedra. The corner-sharing octahedral tilt angles range from 7-55°. The C(1)-C(2) bond length is 1.38 Å. In the second C site, C(2) is bonded in a 5-coordinate geometry to two equivalent Dy(1), two equivalent Fe(1), and one C(1) atom.