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BaAu2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ba2+ is bonded to twelve equivalent Au1- atoms to form a mixture of face and edge-sharing BaAu12 cuboctahedra. All Ba–Au bond lengths are 3.54 Å. Au1- is bonded in a 9-coordinate geometry to six equivalent Ba2+ and three equivalent Au1- atoms. All Au–Au bond lengths are 2.83 Å.
BaAu2(SO4)4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.80 Å) and four longer (2.83 Å) Ba–O bond lengths. There are two inequivalent Au3+ sites. In the first Au3+ site, Au3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Au–O bond lengths are 2.04 Å. In the second Au3+ site, Au3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Au–O bond lengths are 2.03 Å. S6+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.45 Å) and two longer (1.55 Å) S–O bond length. There are four 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 single-bond geometry to one Ba2+ and one S6+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Au3+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ and one S6+ atom.