MoPt2Si3 crystallizes in the orthorhombic Pmc2_1 space group. Mo(1) is bonded in a 7-coordinate geometry to one Si(3), two equivalent Si(2), and four equivalent Si(1) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to one Si(3), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Pt site, Pt(2) is bonded in a 6-coordinate geometry to two equivalent Si(2) and four equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to four equivalent Mo(1) and two equivalent Pt(1) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Mo(1), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to one Mo(1), one Pt(1), and four equivalent Pt(2) atoms.
MoPt2Si3 crystallizes in the orthorhombic Pmc2_1 space group. Mo(1) is bonded in a 7-coordinate geometry to one Si(3), two equivalent Si(2), and four equivalent Si(1) atoms. The Mo(1)-Si(3) bond length is 2.61 Å. Both Mo(1)-Si(2) bond lengths are 2.57 Å. There are two shorter (2.53 Å) and two longer (2.54 Å) Mo(1)-Si(1) bond lengths. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to one Si(3), two equivalent Si(1), and two equivalent Si(2) atoms. The Pt(1)-Si(3) bond length is 2.39 Å. Both Pt(1)-Si(1) bond lengths are 2.41 Å. Both Pt(1)-Si(2) bond lengths are 2.53 Å. In the second Pt site, Pt(2) is bonded in a 6-coordinate geometry to two equivalent Si(2) and four equivalent Si(3) atoms. There is one shorter (2.48 Å) and one longer (2.52 Å) Pt(2)-Si(2) bond length. There are two shorter (2.42 Å) and two longer (2.73 Å) Pt(2)-Si(3) bond lengths. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to four equivalent Mo(1) and two equivalent Pt(1) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Mo(1), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to one Mo(1), one Pt(1), and four equivalent Pt(2) atoms.