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LuAu is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Lu is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Lu–Au bond lengths are 3.06 Å. Au is bonded in a body-centered cubic geometry to eight equivalent Lu atoms.
Au2Lu crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a distorted q6 geometry to ten equivalent Au atoms. There are eight shorter (2.99 Å) and two longer (3.04 Å) Lu–Au bond lengths. Au is bonded in a 10-coordinate geometry to five equivalent Lu atoms.
LuAu3 is beta Cu3Ti structured and crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. Lu3+ is bonded to twelve Au1- atoms to form a mixture of edge, corner, and face-sharing LuAu12 cuboctahedra. There are a spread of Lu–Au bond distances ranging from 2.97–3.07 Å. There are two inequivalent Au1- sites. In the first Au1- site, Au1- is bonded in a distorted see-saw-like geometry to four equivalent Lu3+ atoms. In the second Au1- site, Au1- is bonded in a 12-coordinate geometry to four equivalent Lu3+ atoms.