UFe2SiC crystallizes in the orthorhombic Cmcm space group. U(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four 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 three equivalent U(1) and six equivalent Fe(1) atoms. C(1) is bonded to four equivalent U(1) and two equivalent Fe(1) atoms to form a mixture of distorted edge and corner-sharing CU4Fe2 octahedra. The corner-sharing octahedral tilt angles are 29°.
UFe2SiC crystallizes in the orthorhombic Cmcm space group. U(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. There is one shorter (2.99 Å) and two longer (3.00 Å) U(1)-Si(1) bond lengths. All U(1)-C(1) bond lengths are 2.56 Å. Fe(1) is bonded in a distorted single-bond geometry to three equivalent Si(1) and one C(1) atom. There is one shorter (2.33 Å) and two longer (2.34 Å) Fe(1)-Si(1) bond lengths. The Fe(1)-C(1) bond length is 1.78 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent U(1) and six equivalent Fe(1) atoms. C(1) is bonded to four equivalent U(1) and two equivalent Fe(1) atoms to form a mixture of distorted edge and corner-sharing CU4Fe2 octahedra. The corner-sharing octahedral tilt angles are 29°.