Zr9Pt11 crystallizes in the tetragonal I4/m space group. There are three inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a 9-coordinate geometry to one Pt(3), two equivalent Pt(2), and six equivalent Pt(1) atoms. In the second Zr site, Zr(2) is bonded in a distorted body-centered cubic geometry to two equivalent Pt(2) and six equivalent Pt(1) atoms. In the third Zr site, Zr(3) is bonded in a 10-coordinate geometry to two equivalent Pt(3) and eight equivalent Pt(1) atoms. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 7-coordinate geometry to one Zr(3), three equivalent Zr(1), and three equivalent Zr(2) atoms. In the second Pt site, Pt(2) is bonded in a 8-coordinate geometry to four equivalent Zr(1) and four equivalent Zr(2) atoms. In the third Pt site, Pt(3) is bonded in a distorted square co-planar geometry to two equivalent Zr(3) and four equivalent Zr(1) atoms.
Zr9Pt11 crystallizes in the tetragonal I4/m space group. There are three inequivalent Zr sites. In the first Zr site, Zr(1) is bonded in a 9-coordinate geometry to one Pt(3), two equivalent Pt(2), and six equivalent Pt(1) atoms. The Zr(1)-Pt(3) bond length is 2.79 Å. Both Zr(1)-Pt(2) bond lengths are 3.22 Å. There are a spread of Zr(1)-Pt(1) bond distances ranging from 2.83-2.90 Å. In the second Zr site, Zr(2) is bonded in a distorted body-centered cubic geometry to two equivalent Pt(2) and six equivalent Pt(1) atoms. Both Zr(2)-Pt(2) bond lengths are 2.83 Å. There are a spread of Zr(2)-Pt(1) bond distances ranging from 2.76-2.85 Å. In the third Zr site, Zr(3) is bonded in a 10-coordinate geometry to two equivalent Pt(3) and eight equivalent Pt(1) atoms. Both Zr(3)-Pt(3) bond lengths are 3.43 Å. All Zr(3)-Pt(1) bond lengths are 3.03 Å. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 7-coordinate geometry to one Zr(3), three equivalent Zr(1), and three equivalent Zr(2) atoms. In the second Pt site, Pt(2) is bonded in a 8-coordinate geometry to four equivalent Zr(1) and four equivalent Zr(2) atoms. In the third Pt site, Pt(3) is bonded in a distorted square co-planar geometry to two equivalent Zr(3) and four equivalent Zr(1) atoms.