Pt6AlSi is Uranium Silicide-derived structured and crystallizes in the orthorhombic Cmmm space group. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pt(2), four equivalent Pt(3), two equivalent Al(1), and two equivalent Si(1) atoms to form distorted PtAl2Si2Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with four equivalent Al(1)Pt12 cuboctahedra, edges with four equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with six equivalent Pt(1)Al2Si2Pt8 cuboctahedra. In the second Pt site, Pt(2) is bonded to four equivalent Pt(1), four equivalent Pt(3), two equivalent Al(1), and two equivalent Si(1) atoms to form distorted PtAl2Si2Pt8 cuboctahedra that share corners with twelve equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with four equivalent Al(1)Pt12 cuboctahedra, edges with four equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with six equivalent Pt(2)Al2Si2Pt8 cuboctahedra. In the third Pt site, Pt(3) is bonded to four equivalent Pt(1), four equivalent Pt(2), two equivalent Al(1), and two equivalent Si(1) atoms to form distorted PtAl2Si2Pt8 cuboctahedra that share corners with twelve equivalent Pt(3)Al2Si2Pt8 cuboctahedra, edges with four equivalent Al(1)Pt12 cuboctahedra, edges with four equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, and faces with six equivalent Pt(3)Al2Si2Pt8 cuboctahedra. Al(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(3) atoms to form AlPt12 cuboctahedra that share corners with four equivalent Al(1)Pt12 cuboctahedra, corners with eight equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with four equivalent Si(1)Pt12 cuboctahedra. Si(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(3) atoms to form SiPt12 cuboctahedra that share corners with four equivalent Si(1)Pt12 cuboctahedra, corners with eight equivalent Al(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with four equivalent Al(1)Pt12 cuboctahedra.
Pt6AlSi is Uranium Silicide-derived structured and crystallizes in the orthorhombic Cmmm space group. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pt(2), four equivalent Pt(3), two equivalent Al(1), and two equivalent Si(1) atoms to form distorted PtAl2Si2Pt8 cuboctahedra that share corners with twelve equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with four equivalent Al(1)Pt12 cuboctahedra, edges with four equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with six equivalent Pt(1)Al2Si2Pt8 cuboctahedra. There are two shorter (2.77 Å) and two longer (2.78 Å) Pt(1)-Pt(2) bond lengths. All Pt(1)-Pt(3) bond lengths are 2.76 Å. Both Pt(1)-Al(1) bond lengths are 2.70 Å. Both Pt(1)-Si(1) bond lengths are 2.86 Å. In the second Pt site, Pt(2) is bonded to four equivalent Pt(1), four equivalent Pt(3), two equivalent Al(1), and two equivalent Si(1) atoms to form distorted PtAl2Si2Pt8 cuboctahedra that share corners with twelve equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with four equivalent Al(1)Pt12 cuboctahedra, edges with four equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with six equivalent Pt(2)Al2Si2Pt8 cuboctahedra. All Pt(2)-Pt(3) bond lengths are 2.78 Å. Both Pt(2)-Al(1) bond lengths are 2.85 Å. Both Pt(2)-Si(1) bond lengths are 2.68 Å. In the third Pt site, Pt(3) is bonded to four equivalent Pt(1), four equivalent Pt(2), two equivalent Al(1), and two equivalent Si(1) atoms to form distorted PtAl2Si2Pt8 cuboctahedra that share corners with twelve equivalent Pt(3)Al2Si2Pt8 cuboctahedra, edges with four equivalent Al(1)Pt12 cuboctahedra, edges with four equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, and faces with six equivalent Pt(3)Al2Si2Pt8 cuboctahedra. Both Pt(3)-Al(1) bond lengths are 2.77 Å. Both Pt(3)-Si(1) bond lengths are 2.77 Å. Al(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(3) atoms to form AlPt12 cuboctahedra that share corners with four equivalent Al(1)Pt12 cuboctahedra, corners with eight equivalent Si(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Al(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with four equivalent Si(1)Pt12 cuboctahedra. Si(1) is bonded to four equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(3) atoms to form SiPt12 cuboctahedra that share corners with four equivalent Si(1)Pt12 cuboctahedra, corners with eight equivalent Al(1)Pt12 cuboctahedra, edges with eight equivalent Pt(1)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(2)Al2Si2Pt8 cuboctahedra, edges with eight equivalent Pt(3)Al2Si2Pt8 cuboctahedra, faces with two equivalent Si(1)Pt12 cuboctahedra, faces with four equivalent Pt(1)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(2)Al2Si2Pt8 cuboctahedra, faces with four equivalent Pt(3)Al2Si2Pt8 cuboctahedra, and faces with four equivalent Al(1)Pt12 cuboctahedra.