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YAu is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Y is bonded in a body-centered cubic geometry to eight equivalent Au atoms. All Y–Au bond lengths are 3.13 Å. Au is bonded in a body-centered cubic geometry to eight equivalent Y atoms.
AuI crystallizes in the tetragonal P4_2/ncm space group. The structure is one-dimensional and consists of two AuI ribbons oriented in the (1, 1, 0) direction. Au1+ is bonded in a distorted linear geometry to two equivalent I1- atoms. Both Au–I bond lengths are 2.63 Å. I1- is bonded in a distorted L-shaped geometry to two equivalent Au1+ atoms.
Y2Au is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Au atoms to form a mixture of corner and edge-sharing YAu4 tetrahedra. There are a spread of Y–Au bond distances ranging from 2.92–3.08 Å. In the second Y site, Y is bonded in a 3-coordinate geometry to five equivalent Au atoms. There are a spread of Y–Au bond distances ranging from 2.97–3.65 Å. Au is bonded in a 9-coordinate geometry to nine Y atoms.