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LaRu2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. La is bonded in a 12-coordinate geometry to twelve equivalent Ru atoms. All La–Ru bond lengths are 3.20 Å. Ru is bonded to six equivalent La and six equivalent Ru atoms to form a mixture of face, edge, and corner-sharing RuLa6Ru6 cuboctahedra. All Ru–Ru bond lengths are 2.73 Å.
La5Ru2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are three inequivalent La sites. In the first La site, La is bonded in a 2-coordinate geometry to three equivalent Ru atoms. There are a spread of La–Ru bond distances ranging from 2.72–3.64 Å. In the second La site, La is bonded to four equivalent Ru atoms to form distorted edge-sharing LaRu4 tetrahedra. All La–Ru bond lengths are 3.06 Å. In the third La site, La is bonded in a 3-coordinate geometry to three equivalent Ru atoms. There are a spread of La–Ru bond distances ranging from 2.89–3.29 Å. Ru is bonded in a 7-coordinate geometry to eight La atoms.