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TmAu is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tm is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Tm–Au bond lengths are 3.08 Å. Au is bonded in a body-centered cubic geometry to eight equivalent Tm atoms.
TmAu2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tm is bonded in a distorted q6 geometry to ten equivalent Au atoms. There are eight shorter (3.01 Å) and two longer (3.03 Å) Tm–Au bond lengths. Au is bonded in a 10-coordinate geometry to five equivalent Tm atoms.
TmAu is alpha-derived structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Tm is bonded in a 7-coordinate geometry to seven equivalent Au atoms. There are a spread of Tm–Au bond distances ranging from 2.97–3.10 Å. Au is bonded in a 7-coordinate geometry to seven equivalent Tm atoms.
Tm2Au is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Tm sites. In the first Tm site, Tm is bonded to four equivalent Au atoms to form a mixture of edge and corner-sharing TmAu4 tetrahedra. There are a spread of Tm–Au bond distances ranging from 2.87–3.00 Å. In the second Tm site, Tm is bonded in a 3-coordinate geometry to five equivalent Au atoms. There are a spread of Tm–Au bond distances ranging from 2.94–3.53 Å. Au is bonded in a 9-coordinate geometry to nine Tm atoms.