U3Pt5Si crystallizes in the orthorhombic Ima2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 9-coordinate geometry to one Pt(3), four equivalent Pt(1), and four equivalent Pt(2) atoms. In the second U site, U(2) is bonded in a 6-coordinate geometry to one Pt(3), two equivalent Pt(1), four equivalent Pt(2), and one Si(1) atom. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 6-coordinate geometry to one U(2), four equivalent U(1), two equivalent Pt(2), and one Si(1) atom. In the second Pt site, Pt(2) is bonded in a 11-coordinate geometry to two equivalent U(2), four equivalent U(1), one Pt(2), one Pt(3), two equivalent Pt(1), and one Si(1) atom. In the third Pt site, Pt(3) is bonded in a 5-coordinate geometry to one U(2), two equivalent U(1), two equivalent Pt(2), and two equivalent Si(1) atoms. Si(1) is bonded in a 7-coordinate geometry to one U(2), two equivalent Pt(1), two equivalent Pt(2), and two equivalent Pt(3) atoms.
U3Pt5Si crystallizes in the orthorhombic Ima2 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 9-coordinate geometry to one Pt(3), four equivalent Pt(1), and four equivalent Pt(2) atoms. The U(1)-Pt(3) bond length is 2.99 Å. There are a spread of U(1)-Pt(1) bond distances ranging from 2.98-3.09 Å. There are a spread of U(1)-Pt(2) bond distances ranging from 2.93-3.07 Å. In the second U site, U(2) is bonded in a 6-coordinate geometry to one Pt(3), two equivalent Pt(1), four equivalent Pt(2), and one Si(1) atom. The U(2)-Pt(3) bond length is 2.91 Å. Both U(2)-Pt(1) bond lengths are 2.86 Å. There are two shorter (2.92 Å) and two longer (3.30 Å) U(2)-Pt(2) bond lengths. The U(2)-Si(1) bond length is 2.96 Å. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 6-coordinate geometry to one U(2), four equivalent U(1), two equivalent Pt(2), and one Si(1) atom. There is one shorter (2.87 Å) and one longer (2.92 Å) Pt(1)-Pt(2) bond length. The Pt(1)-Si(1) bond length is 2.54 Å. In the second Pt site, Pt(2) is bonded in a 11-coordinate geometry to two equivalent U(2), four equivalent U(1), one Pt(2), one Pt(3), two equivalent Pt(1), and one Si(1) atom. The Pt(2)-Pt(2) bond length is 2.84 Å. The Pt(2)-Pt(3) bond length is 2.94 Å. The Pt(2)-Si(1) bond length is 2.55 Å. In the third Pt site, Pt(3) is bonded in a 5-coordinate geometry to one U(2), two equivalent U(1), two equivalent Pt(2), and two equivalent Si(1) atoms. There is one shorter (2.40 Å) and one longer (2.53 Å) Pt(3)-Si(1) bond length. Si(1) is bonded in a 7-coordinate geometry to one U(2), two equivalent Pt(1), two equivalent Pt(2), and two equivalent Pt(3) atoms.