TmRu2SiC crystallizes in the orthorhombic Cmcm space group. Tm(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. Ru(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 Tm(1) and six equivalent Ru(1) atoms. C(1) is bonded to four equivalent Tm(1) and two equivalent Ru(1) atoms to form a mixture of edge and corner-sharing CTm4Ru2 octahedra. The corner-sharing octahedral tilt angles are 22°.
TmRu2SiC crystallizes in the orthorhombic Cmcm space group. Tm(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. All Tm(1)-Si(1) bond lengths are 3.11 Å. All Tm(1)-C(1) bond lengths are 2.64 Å. Ru(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and one C(1) atom. There are two shorter (2.46 Å) and one longer (2.47 Å) Ru(1)-Si(1) bond length. The Ru(1)-C(1) bond length is 1.87 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent Tm(1) and six equivalent Ru(1) atoms. C(1) is bonded to four equivalent Tm(1) and two equivalent Ru(1) atoms to form a mixture of edge and corner-sharing CTm4Ru2 octahedra. The corner-sharing octahedral tilt angles are 22°.