MoPt3Si4 crystallizes in the orthorhombic Pnma space group. Mo(1) is bonded in a 7-coordinate geometry to one Si(3), two equivalent Si(2), and four equivalent Si(4) atoms. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 6-coordinate geometry to one Si(2), two equivalent Si(3), and three equivalent Si(1) atoms. In the second Pt site, Pt(2) is bonded in a 5-coordinate geometry to one Si(3), two equivalent Si(2), and two equivalent Si(4) atoms. In the third Pt site, Pt(3) is bonded in a 6-coordinate geometry to one Si(2), two equivalent Si(3), and three equivalent Si(1) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to three equivalent Pt(1) and three equivalent Pt(3) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Mo(1), one Pt(1), one Pt(3), 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(2), two equivalent Pt(1), and two equivalent Pt(3) atoms. In the fourth Si site, Si(4) is bonded in a 6-coordinate geometry to four equivalent Mo(1) and two equivalent Pt(2) atoms.
MoPt3Si4 crystallizes in the orthorhombic Pnma space group. Mo(1) is bonded in a 7-coordinate geometry to one Si(3), two equivalent Si(2), and four equivalent Si(4) atoms. The Mo(1)-Si(3) bond length is 2.60 Å. Both Mo(1)-Si(2) bond lengths are 2.57 Å. There are two shorter (2.54 Å) and two longer (2.55 Å) Mo(1)-Si(4) bond lengths. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 6-coordinate geometry to one Si(2), two equivalent Si(3), and three equivalent Si(1) atoms. The Pt(1)-Si(2) bond length is 2.48 Å. Both Pt(1)-Si(3) bond lengths are 2.73 Å. There are two shorter (2.41 Å) and one longer (2.50 Å) Pt(1)-Si(1) bond length. In the second Pt site, Pt(2) is bonded in a 5-coordinate geometry to one Si(3), two equivalent Si(2), and two equivalent Si(4) atoms. The Pt(2)-Si(3) bond length is 2.39 Å. Both Pt(2)-Si(2) bond lengths are 2.54 Å. Both Pt(2)-Si(4) bond lengths are 2.42 Å. In the third Pt site, Pt(3) is bonded in a 6-coordinate geometry to one Si(2), two equivalent Si(3), and three equivalent Si(1) atoms. The Pt(3)-Si(2) bond length is 2.59 Å. Both Pt(3)-Si(3) bond lengths are 2.46 Å. There is one shorter (2.41 Å) and two longer (2.60 Å) Pt(3)-Si(1) bond lengths. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 6-coordinate geometry to three equivalent Pt(1) and three equivalent Pt(3) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to two equivalent Mo(1), one Pt(1), one Pt(3), 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(2), two equivalent Pt(1), and two equivalent Pt(3) atoms. In the fourth Si site, Si(4) is bonded in a 6-coordinate geometry to four equivalent Mo(1) and two equivalent Pt(2) atoms.