Th(PtSi)2 crystallizes in the tetragonal P4/nmm space group. Th(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 4-coordinate geometry to four equivalent Th(1) and four equivalent Si(2) atoms. In the second Pt site, Pt(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one Si(2), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent Pt(2) atoms. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one Pt(2), and four equivalent Pt(1) atoms.
Th(PtSi)2 crystallizes in the tetragonal P4/nmm space group. Th(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 Th(1)-Pt(1) bond lengths are 3.25 Å. All Th(1)-Pt(2) bond lengths are 3.28 Å. All Th(1)-Si(1) bond lengths are 3.25 Å. All Th(1)-Si(2) bond lengths are 3.24 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent Si(2) atoms. All Pt(1)-Si(2) bond lengths are 2.50 Å. In the second Pt site, Pt(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one Si(2), and four equivalent Si(1) atoms. The Pt(2)-Si(2) bond length is 2.44 Å. All Pt(2)-Si(1) bond lengths are 2.44 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to four equivalent Th(1) and four equivalent Pt(2) atoms. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to four equivalent Th(1), one Pt(2), and four equivalent Pt(1) atoms.