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LuOs3 is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Lu3+ is bonded to twelve equivalent Os1- atoms to form a mixture of face and corner-sharing LuOs12 cuboctahedra. There are six shorter (2.85 Å) and six longer (2.86 Å) Lu–Os bond lengths. Os1- is bonded in a distorted see-saw-like geometry to four equivalent Lu3+ atoms.
LuOs2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Lu3+ is bonded in a 12-coordinate geometry to twelve Os+1.50- atoms. There are nine shorter (3.11 Å) and three longer (3.12 Å) Lu–Os bond lengths. There are two inequivalent Os+1.50- sites. In the first Os+1.50- site, Os+1.50- is bonded to six equivalent Lu3+ and six equivalent Os+1.50- atoms to form a mixture of corner, edge, and face-sharing OsLu6Os6 cuboctahedra. All Os–Os bond lengths are 2.70 Å. In the second Os+1.50- site, Os+1.50- is bonded to six equivalent Lu3+ and six Os+1.50- atoms to form a mixture of corner, edge, and face-sharing OsLu6Os6 cuboctahedra. There are two shorter (2.55 Å) and two longer (2.75 Å) Os–Os bond lengths.