Y2Fe2Si2C crystallizes in the monoclinic C2/m space group. Y(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 9-coordinate geometry to five equivalent Y(1), three equivalent Fe(1), and one Si(1) atom. C(1) is bonded to four equivalent Y(1) and two equivalent Fe(1) atoms to form distorted edge-sharing CY4Fe2 octahedra.
Y2Fe2Si2C crystallizes in the monoclinic C2/m space group. Y(1) is bonded in a 2-coordinate geometry to five equivalent Si(1) and two equivalent C(1) atoms. There are a spread of Y(1)-Si(1) bond distances ranging from 2.99-3.03 Å. Both Y(1)-C(1) bond lengths are 2.57 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 (2.28 Å) and one longer (2.31 Å) Fe(1)-Si(1) bond length. The Fe(1)-C(1) bond length is 1.78 Å. Si(1) is bonded in a 9-coordinate geometry to five equivalent Y(1), three equivalent Fe(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.75 Å. C(1) is bonded to four equivalent Y(1) and two equivalent Fe(1) atoms to form distorted edge-sharing CY4Fe2 octahedra.