HoOs2SiC crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. Os(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and one C(1) atom. Si(1) is bonded in a 9-coordinate geometry to three equivalent Ho(1) and six equivalent Os(1) atoms. C(1) is bonded to four equivalent Ho(1) and two equivalent Os(1) atoms to form a mixture of corner and edge-sharing CHo4Os2 octahedra. The corner-sharing octahedral tilt angles are 22°.
HoOs2SiC crystallizes in the orthorhombic Cmcm space group. Ho(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. There is one shorter (3.09 Å) and two longer (3.13 Å) Ho(1)-Si(1) bond lengths. All Ho(1)-C(1) bond lengths are 2.67 Å. Os(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and one C(1) atom. All Os(1)-Si(1) bond lengths are 2.48 Å. The Os(1)-C(1) bond length is 1.88 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent Ho(1) and six equivalent Os(1) atoms. C(1) is bonded to four equivalent Ho(1) and two equivalent Os(1) atoms to form a mixture of corner and edge-sharing CHo4Os2 octahedra. The corner-sharing octahedral tilt angles are 22°.