Au5Sn crystallizes in the trigonal R32 space group. There are seven inequivalent Au sites. In the first Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2,2); and three equivalent Sn(1) atoms. In the second Au site, Au(2) is bonded to four Au(1,1,1); six Au(2,2); and two equivalent Sn(1) atoms to form distorted AuSn2Au10 cuboctahedra that share corners with eighteen Au(2,2)Sn2Au10 cuboctahedra; edges with four equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Au(2)Sn2Au10 cuboctahedra; faces with four equivalent Sn(1)Au12 cuboctahedra; and faces with eight Au(2,2)Sn2Au10 cuboctahedra. In the third Au site, Au(2) is bonded to four Au(1,1,1); six Au(2,2); and two equivalent Sn(1) atoms to form distorted AuSn2Au10 cuboctahedra that share corners with eighteen Au(2,2,2)Sn2Au10 cuboctahedra; edges with four equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Au(2)Sn2Au10 cuboctahedra; faces with four equivalent Sn(1)Au12 cuboctahedra; and faces with eight Au(2,2,2)Sn2Au10 cuboctahedra. In the fourth Au site, Au(2) is bonded to four Au(1,1,1); six Au(2,2); and two equivalent Sn(1) atoms to form distorted AuSn2Au10 cuboctahedra that share corners with eighteen Au(2,2,2)Sn2Au10 cuboctahedra; edges with four equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Au(2)Sn2Au10 cuboctahedra; faces with four equivalent Sn(1)Au12 cuboctahedra; and faces with eight Au(2,2)Sn2Au10 cuboctahedra. In the fifth Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2,2); and three equivalent Sn(1) atoms. In the sixth Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2); and three equivalent Sn(1) atoms. In the seventh Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2,2); and three equivalent Sn(1) atoms. Sn(1) is bonded to six Au(1,1) and six Au(2,2,2) atoms to form SnAu12 cuboctahedra that share corners with six equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Sn(1)Au12 cuboctahedra; edges with twelve Au(2,2,2)Sn2Au10 cuboctahedra; and faces with twelve Au(2,2,2)Sn2Au10 cuboctahedra.
Au5Sn crystallizes in the trigonal R32 space group. There are seven inequivalent Au sites. In the first Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2,2); and three equivalent Sn(1) atoms. All Au(1)-Au(1) bond lengths are 2.95 Å. There are three shorter (2.95 Å) and three longer (3.02 Å) Au(1)-Au(2,2,2) bond lengths. All Au(1)-Sn(1) bond lengths are 2.95 Å. In the second Au site, Au(2) is bonded to four Au(1,1,1); six Au(2,2); and two equivalent Sn(1) atoms to form distorted AuSn2Au10 cuboctahedra that share corners with eighteen Au(2,2)Sn2Au10 cuboctahedra; edges with four equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Au(2)Sn2Au10 cuboctahedra; faces with four equivalent Sn(1)Au12 cuboctahedra; and faces with eight Au(2,2)Sn2Au10 cuboctahedra. There is one shorter (2.95 Å) and two longer (3.02 Å) Au(2)-Au(1,1) bond lengths. There are two shorter (2.91 Å) and four longer (2.96 Å) Au(2)-Au(2,2) bond lengths. Both Au(2)-Sn(1) bond lengths are 2.99 Å. In the third Au site, Au(2) is bonded to four Au(1,1,1); six Au(2,2); and two equivalent Sn(1) atoms to form distorted AuSn2Au10 cuboctahedra that share corners with eighteen Au(2,2,2)Sn2Au10 cuboctahedra; edges with four equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Au(2)Sn2Au10 cuboctahedra; faces with four equivalent Sn(1)Au12 cuboctahedra; and faces with eight Au(2,2,2)Sn2Au10 cuboctahedra. There is one shorter (2.95 Å) and two longer (3.02 Å) Au(2)-Au(1,1) bond lengths. There is one shorter (2.91 Å) and two longer (2.96 Å) Au(2)-Au(2) bond lengths. Both Au(2)-Sn(1) bond lengths are 2.99 Å. In the fourth Au site, Au(2) is bonded to four Au(1,1,1); six Au(2,2); and two equivalent Sn(1) atoms to form distorted AuSn2Au10 cuboctahedra that share corners with eighteen Au(2,2,2)Sn2Au10 cuboctahedra; edges with four equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Au(2)Sn2Au10 cuboctahedra; faces with four equivalent Sn(1)Au12 cuboctahedra; and faces with eight Au(2,2)Sn2Au10 cuboctahedra. There is one shorter (2.95 Å) and two longer (3.02 Å) Au(2)-Au(1,1) bond lengths. Both Au(2)-Sn(1) bond lengths are 2.99 Å. In the fifth Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2,2); and three equivalent Sn(1) atoms. All Au(1)-Au(1) bond lengths are 2.95 Å. All Au(1)-Sn(1) bond lengths are 2.95 Å. In the sixth Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2); and three equivalent Sn(1) atoms. All Au(1)-Au(1) bond lengths are 2.95 Å. There are three shorter (2.95 Å) and three longer (3.02 Å) Au(1)-Au(2,2) bond lengths. All Au(1)-Sn(1) bond lengths are 2.95 Å. In the seventh Au site, Au(1) is bonded in a distorted trigonal planar geometry to three equivalent Au(1); six Au(2,2,2); and three equivalent Sn(1) atoms. All Au(1)-Sn(1) bond lengths are 2.95 Å. Sn(1) is bonded to six Au(1,1) and six Au(2,2,2) atoms to form SnAu12 cuboctahedra that share corners with six equivalent Sn(1)Au12 cuboctahedra; edges with six equivalent Sn(1)Au12 cuboctahedra; edges with twelve Au(2,2,2)Sn2Au10 cuboctahedra; and faces with twelve Au(2,2,2)Sn2Au10 cuboctahedra.