PaPt5 crystallizes in the cubic F-43m space group. Pa(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1) and twelve equivalent Pt(2) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pa(1) and twelve equivalent Pt(2) atoms to form distorted PtPa4Pt12 tetrahedra that share corners with twelve equivalent Pt(2)Pa3Pt9 cuboctahedra, faces with twenty-eight equivalent Pt(2)Pa3Pt9 cuboctahedra, and faces with twelve equivalent Pt(1)Pa4Pt12 tetrahedra. In the second Pt site, Pt(2) is bonded to three equivalent Pa(1), three equivalent Pt(1), and six equivalent Pt(2) atoms to form distorted PtPa3Pt9 cuboctahedra that share corners with eighteen equivalent Pt(2)Pa3Pt9 cuboctahedra, corners with three equivalent Pt(1)Pa4Pt12 tetrahedra, edges with six equivalent Pt(2)Pa3Pt9 cuboctahedra, faces with eighteen equivalent Pt(2)Pa3Pt9 cuboctahedra, and faces with seven equivalent Pt(1)Pa4Pt12 tetrahedra.
PaPt5 crystallizes in the cubic F-43m space group. Pa(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1) and twelve equivalent Pt(2) atoms. All Pa(1)-Pt(1) bond lengths are 3.24 Å. All Pa(1)-Pt(2) bond lengths are 3.10 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Pa(1) and twelve equivalent Pt(2) atoms to form distorted PtPa4Pt12 tetrahedra that share corners with twelve equivalent Pt(2)Pa3Pt9 cuboctahedra, faces with twenty-eight equivalent Pt(2)Pa3Pt9 cuboctahedra, and faces with twelve equivalent Pt(1)Pa4Pt12 tetrahedra. All Pt(1)-Pt(2) bond lengths are 3.10 Å. In the second Pt site, Pt(2) is bonded to three equivalent Pa(1), three equivalent Pt(1), and six equivalent Pt(2) atoms to form distorted PtPa3Pt9 cuboctahedra that share corners with eighteen equivalent Pt(2)Pa3Pt9 cuboctahedra, corners with three equivalent Pt(1)Pa4Pt12 tetrahedra, edges with six equivalent Pt(2)Pa3Pt9 cuboctahedra, faces with eighteen equivalent Pt(2)Pa3Pt9 cuboctahedra, and faces with seven equivalent Pt(1)Pa4Pt12 tetrahedra. There are three shorter (2.63 Å) and three longer (2.65 Å) Pt(2)-Pt(2) bond lengths.