SmRe2SiC crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. Re(1) is bonded in a 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 Sm(1) and six equivalent Re(1) atoms. C(1) is bonded to four equivalent Sm(1) and two equivalent Re(1) atoms to form a mixture of edge and corner-sharing CSm4Re2 octahedra. The corner-sharing octahedral tilt angles are 20°.
SmRe2SiC crystallizes in the orthorhombic Cmcm space group. Sm(1) is bonded in a 4-coordinate geometry to three equivalent Si(1) and four equivalent C(1) atoms. There is one shorter (3.04 Å) and two longer (3.14 Å) Sm(1)-Si(1) bond lengths. All Sm(1)-C(1) bond lengths are 2.76 Å. Re(1) is bonded in a single-bond geometry to three equivalent Si(1) and one C(1) atom. There is one shorter (2.49 Å) and two longer (2.52 Å) Re(1)-Si(1) bond lengths. The Re(1)-C(1) bond length is 1.96 Å. Si(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1) and six equivalent Re(1) atoms. C(1) is bonded to four equivalent Sm(1) and two equivalent Re(1) atoms to form a mixture of edge and corner-sharing CSm4Re2 octahedra. The corner-sharing octahedral tilt angles are 20°.