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RuGa2 is Calaverite-like structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Ru is bonded to six equivalent Ga atoms to form edge-sharing RuGa6 octahedra. There are two shorter (2.50 Å) and four longer (2.51 Å) Ru–Ga bond lengths. Ga is bonded in a 3-coordinate geometry to three equivalent Ru atoms.
RuGa2 is Titanium Disilicide structured and crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Ru is bonded in a 10-coordinate geometry to ten equivalent Ga atoms. There are a spread of Ru–Ga bond distances ranging from 2.59–2.77 Å. Ga is bonded in a 10-coordinate geometry to five equivalent Ru and five equivalent Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.60–2.80 Å.