AlPt2 crystallizes in the orthorhombic Pmma space group. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. In the second Pt site, Pt(2) is bonded in a distorted square co-planar geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the third Pt site, Pt(3) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Al(2) atoms. In the fourth Pt site, Pt(4) is bonded to two equivalent Al(3) and four equivalent Al(2) atoms to form a mixture of distorted corner and edge-sharing PtAl6 cuboctahedra. In the fifth Pt site, Pt(5) is bonded in a 6-coordinate geometry to one Al(1), two equivalent Al(3), and three equivalent Al(2) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pt(3), two equivalent Pt(5), four equivalent Pt(1), and four equivalent Pt(2) atoms to form a mixture of face and corner-sharing AlPt12 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Pt(3), two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(4), and three equivalent Pt(5) atoms. In the third Al site, Al(3) is bonded in a distorted body-centered cubic geometry to two equivalent Pt(1), two equivalent Pt(4), and four equivalent Pt(5) atoms.
AlPt2 crystallizes in the orthorhombic Pmma space group. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 5-coordinate geometry to one Al(3), two equivalent Al(1), and two equivalent Al(2) atoms. The Pt(1)-Al(3) bond length is 2.57 Å. Both Pt(1)-Al(1) bond lengths are 2.86 Å. Both Pt(1)-Al(2) bond lengths are 2.64 Å. In the second Pt site, Pt(2) is bonded in a distorted square co-planar geometry to two equivalent Al(1) and two equivalent Al(2) atoms. Both Pt(2)-Al(1) bond lengths are 2.71 Å. Both Pt(2)-Al(2) bond lengths are 2.69 Å. In the third Pt site, Pt(3) is bonded in a 4-coordinate geometry to two equivalent Al(1) and two equivalent Al(2) atoms. There is one shorter (2.61 Å) and one longer (2.85 Å) Pt(3)-Al(1) bond length. Both Pt(3)-Al(2) bond lengths are 2.61 Å. In the fourth Pt site, Pt(4) is bonded to two equivalent Al(3) and four equivalent Al(2) atoms to form a mixture of distorted corner and edge-sharing PtAl6 cuboctahedra. Both Pt(4)-Al(3) bond lengths are 2.73 Å. All Pt(4)-Al(2) bond lengths are 2.68 Å. In the fifth Pt site, Pt(5) is bonded in a 6-coordinate geometry to one Al(1), two equivalent Al(3), and three equivalent Al(2) atoms. The Pt(5)-Al(1) bond length is 2.96 Å. Both Pt(5)-Al(3) bond lengths are 2.52 Å. There are two shorter (2.69 Å) and one longer (2.82 Å) Pt(5)-Al(2) bond length. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Pt(3), two equivalent Pt(5), four equivalent Pt(1), and four equivalent Pt(2) atoms to form a mixture of face and corner-sharing AlPt12 cuboctahedra. In the second Al site, Al(2) is bonded in a 10-coordinate geometry to one Pt(3), two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(4), and three equivalent Pt(5) atoms. In the third Al site, Al(3) is bonded in a distorted body-centered cubic geometry to two equivalent Pt(1), two equivalent Pt(4), and four equivalent Pt(5) atoms.