Er2MnC4 crystallizes in the orthorhombic Ibam space group. Er(1) is bonded in a 7-coordinate geometry to two equivalent C(1) and five equivalent C(2) atoms. Mn(1) is bonded to four equivalent C(1) atoms to form distorted MnC4 trigonal pyramids that share corners with four equivalent C(2)Er5C octahedra and edges with two equivalent Mn(1)C4 trigonal pyramids. The corner-sharing octahedral tilt angles are 41°. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 5-coordinate geometry to two equivalent Er(1), two equivalent Mn(1), and one C(2) atom. In the second C site, C(2) is bonded to five equivalent Er(1) and one C(1) atom to form distorted CEr5C octahedra that share corners with six equivalent C(2)Er5C octahedra, corners with two equivalent Mn(1)C4 trigonal pyramids, and edges with seven equivalent C(2)Er5C octahedra. The corner-sharing octahedral tilt angles range from 7-53°.
Er2MnC4 crystallizes in the orthorhombic Ibam space group. Er(1) is bonded in a 7-coordinate geometry to two equivalent C(1) and five equivalent C(2) atoms. There is one shorter (2.49 Å) and one longer (2.61 Å) Er(1)-C(1) bond length. There are a spread of Er(1)-C(2) bond distances ranging from 2.36-2.59 Å. Mn(1) is bonded to four equivalent C(1) atoms to form distorted MnC4 trigonal pyramids that share corners with four equivalent C(2)Er5C octahedra and edges with two equivalent Mn(1)C4 trigonal pyramids. The corner-sharing octahedral tilt angles are 41°. All Mn(1)-C(1) bond lengths are 1.95 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 5-coordinate geometry to two equivalent Er(1), two equivalent Mn(1), and one C(2) atom. The C(1)-C(2) bond length is 1.38 Å. In the second C site, C(2) is bonded to five equivalent Er(1) and one C(1) atom to form distorted CEr5C octahedra that share corners with six equivalent C(2)Er5C octahedra, corners with two equivalent Mn(1)C4 trigonal pyramids, and edges with seven equivalent C(2)Er5C octahedra. The corner-sharing octahedral tilt angles range from 7-53°.