NdOs2SiC crystallizes in the orthorhombic Cmcm space group. Nd(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 1-coordinate geometry to three equivalent Si(1) and one C(1) atom. Si(1) is bonded in a 9-coordinate geometry to three equivalent Nd(1) and six equivalent Os(1) atoms. C(1) is bonded to four equivalent Nd(1) and two equivalent Os(1) atoms to form a mixture of edge and corner-sharing CNd4Os2 octahedra. The corner-sharing octahedral tilt angles are 23°.
NdOs2SiC crystallizes in the orthorhombic Cmcm space group. Nd(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. There is one shorter (3.10 Å) and two longer (3.17 Å) Nd(1)-Si(1) bond lengths. All Nd(1)-C(1) bond lengths are 2.74 Å. Os(1) is bonded in a 1-coordinate geometry to three equivalent Si(1) and one C(1) atom. All Os(1)-Si(1) bond lengths are 2.52 Å. The Os(1)-C(1) bond length is 1.90 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent Nd(1) and six equivalent Os(1) atoms. C(1) is bonded to four equivalent Nd(1) and two equivalent Os(1) atoms to form a mixture of edge and corner-sharing CNd4Os2 octahedra. The corner-sharing octahedral tilt angles are 23°.