Th3Pt5 crystallizes in the hexagonal P-62m space group. Th(1) is bonded in a 8-coordinate geometry to four equivalent Pt(2) and six equivalent Pt(1) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 10-coordinate geometry to six equivalent Th(1), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the second Pt site, Pt(2) is bonded in a 9-coordinate geometry to six equivalent Th(1) and three equivalent Pt(1) atoms.
Th3Pt5 crystallizes in the hexagonal P-62m space group. Th(1) is bonded in a 8-coordinate geometry to four equivalent Pt(2) and six equivalent Pt(1) atoms. All Th(1)-Pt(2) bond lengths are 3.03 Å. There are four shorter (3.00 Å) and two longer (3.56 Å) Th(1)-Pt(1) bond lengths. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 10-coordinate geometry to six equivalent Th(1), two equivalent Pt(1), and two equivalent Pt(2) atoms. Both Pt(1)-Pt(1) bond lengths are 2.86 Å. Both Pt(1)-Pt(2) bond lengths are 2.88 Å. In the second Pt site, Pt(2) is bonded in a 9-coordinate geometry to six equivalent Th(1) and three equivalent Pt(1) atoms.