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SrAu2 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Sr2+ is bonded in a 12-coordinate geometry to twelve equivalent Au1- atoms. There are a spread of Sr–Au bond distances ranging from 3.34–3.47 Å. Au1- is bonded in a 10-coordinate geometry to six equivalent Sr2+ and four equivalent Au1- atoms. There are three shorter (2.81 Å) and one longer (3.20 Å) Au–Au bond lengths.
SrAu2(SO4)4 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.52–2.74 Å. There are two inequivalent Au3+ sites. In the first Au3+ site, Au3+ is bonded in a square co-planar geometry to four O2- atoms. There are two shorter (2.03 Å) and two longer (2.04 Å) Au–O bond lengths. In the second Au3+ site, Au3+ is bonded in a square co-planar geometry to four O2- atoms. All Au–O bond lengths are 2.03 Å. There are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of S–O bond distances ranging from 1.44–1.55 Å. In the second S6+ site, S6+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of S–O bond distances ranging from 1.45–1.55 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to one Au3+ and one S6+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to one Sr2+ and one S6+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Sr2+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Au3+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a bent 120 degrees geometry to one Au3+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Sr2+ and one S6+ atom. In the seventh O2- site, O2- is bonded in a distorted linear geometry to one Sr2+ and one S6+ atom. In the eighth O2- site, O2- is bonded in a bent 120 degrees geometry to one Au3+ and one S6+ atom.