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SmRu2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to twelve equivalent Ru atoms. All Sm–Ru bond lengths are 3.16 Å. Ru is bonded to six equivalent Sm and six equivalent Ru atoms to form a mixture of face, edge, and corner-sharing RuSm6Ru6 cuboctahedra. All Ru–Ru bond lengths are 2.70 Å.
Sm3Ru is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a 2-coordinate geometry to three equivalent Ru atoms. There are a spread of Sm–Ru bond distances ranging from 2.88–3.35 Å. In the second Sm site, Sm is bonded in a distorted bent 150 degrees geometry to two equivalent Ru atoms. There are one shorter (2.81 Å) and one longer (2.87 Å) Sm–Ru bond lengths. Ru is bonded in a 6-coordinate geometry to eight Sm atoms.
Sm5Ru2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent Sm sites. In the first Sm site, Sm is bonded in a 2-coordinate geometry to three equivalent Ru atoms. There are a spread of Sm–Ru bond distances ranging from 2.80–3.48 Å. In the second Sm site, Sm is bonded to four equivalent Ru atoms to form distorted edge-sharing SmRu4 tetrahedra. There are two shorter (2.95 Å) and two longer (3.00 Å) Sm–Ru bond lengths. In the third Sm site, Sm is bonded in a 3-coordinate geometry to three equivalent Ru atoms. There are a spread of Sm–Ru bond distances ranging from 2.87–3.13 Å. Ru is bonded in a 7-coordinate geometry to eight Sm atoms.