Sm2Fe2Si2C crystallizes in the monoclinic C2/m space group. Sm(1) is bonded in a 2-coordinate geometry to five equivalent Si(1) and two equivalent C(1) atoms. Fe(1) is bonded in a distorted single-bond geometry to three equivalent Si(1) and one C(1) atom. Si(1) is bonded in a 8-coordinate geometry to five equivalent Sm(1) and three equivalent Fe(1) atoms. C(1) is bonded to four equivalent Sm(1) and two equivalent Fe(1) atoms to form distorted edge-sharing CSm4Fe2 octahedra.
Sm2Fe2Si2C crystallizes in the monoclinic C2/m space group. Sm(1) is bonded in a 2-coordinate geometry to five equivalent Si(1) and two equivalent C(1) atoms. There are a spread of Sm(1)-Si(1) bond distances ranging from 3.02-3.13 Å. Both Sm(1)-C(1) bond lengths are 2.63 Å. Fe(1) is bonded in a distorted single-bond geometry to three equivalent Si(1) and one C(1) atom. There are two shorter (2.30 Å) and one longer (2.31 Å) Fe(1)-Si(1) bond length. The Fe(1)-C(1) bond length is 1.79 Å. Si(1) is bonded in a 8-coordinate geometry to five equivalent Sm(1) and three equivalent Fe(1) atoms. C(1) is bonded to four equivalent Sm(1) and two equivalent Fe(1) atoms to form distorted edge-sharing CSm4Fe2 octahedra.