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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.
SmRu2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to twelve Ru atoms. There are nine shorter (3.13 Å) and three longer (3.26 Å) Sm–Ru bond lengths. There are two inequivalent Ru sites. In the first Ru site, Ru is bonded to six equivalent Sm and six equivalent Ru atoms to form a mixture of edge, corner, and face-sharing RuSm6Ru6 cuboctahedra. All Ru–Ru bond lengths are 2.77 Å. In the second Ru site, Ru is bonded to six equivalent Sm and six Ru atoms to form a mixture of edge, corner, and face-sharing RuSm6Ru6 cuboctahedra. There are two shorter (2.58 Å) and two longer (2.72 Å) Ru–Ru bond lengths.