Sr7Pt3 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one Pt(2) and two equivalent Pt(1) atoms. In the second Sr site, Sr(2) is bonded in a 3-coordinate geometry to three equivalent Pt(1) atoms. In the third Sr site, Sr(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Pt(2) atoms. In the fourth Sr site, Sr(4) is bonded to two equivalent Pt(1) and two equivalent Pt(2) atoms to form a mixture of distorted edge and corner-sharing SrPt4 tetrahedra. There are two inequivalent Pt sites. In the first Pt site, Pt(2) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), and four equivalent Sr(4) atoms. In the second Pt site, Pt(1) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent Sr(4), and three equivalent Sr(2) atoms.
Sr7Pt3 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one Pt(2) and two equivalent Pt(1) atoms. The Sr(1)-Pt(2) bond length is 3.53 Å. There is one shorter (3.05 Å) and one longer (3.09 Å) Sr(1)-Pt(1) bond length. In the second Sr site, Sr(2) is bonded in a 3-coordinate geometry to three equivalent Pt(1) atoms. There are a spread of Sr(2)-Pt(1) bond distances ranging from 3.08-3.27 Å. In the third Sr site, Sr(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Pt(2) atoms. There is one shorter (3.03 Å) and one longer (3.05 Å) Sr(3)-Pt(2) bond length. In the fourth Sr site, Sr(4) is bonded to two equivalent Pt(1) and two equivalent Pt(2) atoms to form a mixture of distorted edge and corner-sharing SrPt4 tetrahedra. There is one shorter (3.19 Å) and one longer (3.28 Å) Sr(4)-Pt(1) bond length. There is one shorter (3.17 Å) and one longer (3.21 Å) Sr(4)-Pt(2) bond length. There are two inequivalent Pt sites. In the first Pt site, Pt(2) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), and four equivalent Sr(4) atoms. In the second Pt site, Pt(1) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent Sr(4), and three equivalent Sr(2) atoms.