GdPt2Si2 crystallizes in the tetragonal P4/nmm space group. Gd(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1), four equivalent Pt(2), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to four equivalent Gd(1), one Si(1), and four equivalent Si(2) atoms. In the second Pt site, Pt(2) is bonded to four equivalent Gd(1) and four equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing PtGd4Si4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to four equivalent Gd(1), one Pt(1), and four equivalent Pt(2) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to four equivalent Gd(1) and four equivalent Pt(1) atoms.
GdPt2Si2 crystallizes in the tetragonal P4/nmm space group. Gd(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1), four equivalent Pt(2), four equivalent Si(1), and four equivalent Si(2) atoms. All Gd(1)-Pt(1) bond lengths are 3.20 Å. All Gd(1)-Pt(2) bond lengths are 3.27 Å. All Gd(1)-Si(1) bond lengths are 3.20 Å. All Gd(1)-Si(2) bond lengths are 3.20 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to four equivalent Gd(1), one Si(1), and four equivalent Si(2) atoms. The Pt(1)-Si(1) bond length is 2.40 Å. All Pt(1)-Si(2) bond lengths are 2.42 Å. In the second Pt site, Pt(2) is bonded to four equivalent Gd(1) and four equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing PtGd4Si4 tetrahedra. All Pt(2)-Si(1) bond lengths are 2.47 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 5-coordinate geometry to four equivalent Gd(1), one Pt(1), and four equivalent Pt(2) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to four equivalent Gd(1) and four equivalent Pt(1) atoms.