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Sr(PtSi)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to eight equivalent Si4- atoms. All Sr–Si bond lengths are 3.36 Å. Pt3+ is bonded in a 4-coordinate geometry to four equivalent Si4- atoms. All Pt–Si bond lengths are 2.44 Å. Si4- is bonded in a 4-coordinate geometry to four equivalent Sr2+ and four equivalent Pt3+ atoms.
Sr(PtSi)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr2+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Sr–Si bond lengths are 3.31 Å. Pt3+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing PtSi4 tetrahedra. All Pt–Si bond lengths are 2.49 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Sr2+, four equivalent Pt3+, and one Si4- atom. The Si–Si bond length is 2.59 Å.