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Sr2AuP crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Sr2AuP ribbons oriented in the (1, 0, 0) direction. Sr2+ is bonded in a linear geometry to one Au1- and one P3- atom. The Sr–Au bond length is 3.07 Å. The Sr–P bond length is 2.64 Å. Au1- is bonded in a linear geometry to two equivalent Sr2+ atoms. P3- is bonded in a linear geometry to two equivalent Sr2+ atoms.
SrAuP is hexagonal omega structure-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr2+ is bonded to six equivalent Au1+ and six equivalent P3- atoms to form a mixture of edge and face-sharing SrP6Au6 cuboctahedra. All Sr–Au bond lengths are 3.31 Å. All Sr–P bond lengths are 3.31 Å. Au1+ is bonded in a 3-coordinate geometry to six equivalent Sr2+ and three equivalent P3- atoms. All Au–P bond lengths are 2.53 Å. P3- is bonded in a 3-coordinate geometry to six equivalent Sr2+ and three equivalent Au1+ atoms.