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YPtAu2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two YPtAu2 ribbons oriented in the (1, 0, 0) direction. Y is bonded in a linear geometry to two equivalent Au atoms. Both Y–Au bond lengths are 2.57 Å. Pt is bonded in a linear geometry to two equivalent Au atoms. Both Pt–Au bond lengths are 2.53 Å. Au is bonded in a linear geometry to one Y and one Pt atom.
Y2PtAu crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Y2PtAu ribbons oriented in the (1, 0, 0) direction. Y is bonded in a linear geometry to one Pt and one Au atom. The Y–Pt bond length is 2.54 Å. The Y–Au bond length is 2.82 Å. Pt is bonded in a linear geometry to two equivalent Y atoms. Au is bonded in a linear geometry to two equivalent Y atoms.