Y2(CuSn)3 crystallizes in the tetragonal P4/mmm space group. Y(1) is bonded in a distorted linear geometry to one Cu(1) and one Sn(1) atom. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Y(1), four equivalent Cu(1), and one Sn(2) atom to form distorted CuYCu4Sn octahedra that share  a cornercorner with one Sn(1)YCuSn4 octahedra, corners with five equivalent Cu(1)YCu4Sn octahedra, edges with four equivalent Cu(1)YCu4Sn octahedra, and edges with four equivalent Sn(2)Cu2Sn4 octahedra. The corner-sharing octahedra are not tilted. In the second Cu site, Cu(2) is bonded to four equivalent Cu(2) and two equivalent Sn(1) atoms to form distorted CuCu4Sn2 octahedra that share corners with four equivalent Cu(2)Cu4Sn2 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with eight equivalent Sn(1)YCuSn4 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Y(1), one Cu(2), and four equivalent Sn(1) atoms to form distorted SnYCuSn4 octahedra that share  a cornercorner with one Cu(1)YCu4Sn octahedra, corners with five equivalent Sn(1)YCuSn4 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with four equivalent Sn(1)YCuSn4 octahedra. The corner-sharing octahedra are not tilted. In the second Sn site, Sn(2) is bonded to two equivalent Cu(1) and four equivalent Sn(2) atoms to form SnCu2Sn4 octahedra that share corners with four equivalent Sn(2)Cu2Sn4 octahedra, edges with four equivalent Sn(2)Cu2Sn4 octahedra, and edges with eight equivalent Cu(1)YCu4Sn octahedra. The corner-sharing octahedra are not tilted.
Y2(CuSn)3 crystallizes in the tetragonal P4/mmm space group. Y(1) is bonded in a distorted linear geometry to one Cu(1) and one Sn(1) atom. The Y(1)-Cu(1) bond length is 2.81 Å. The Y(1)-Sn(1) bond length is 3.17 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Y(1), four equivalent Cu(1), and one Sn(2) atom to form distorted CuYCu4Sn octahedra that share  a cornercorner with one Sn(1)YCuSn4 octahedra, corners with five equivalent Cu(1)YCu4Sn octahedra, edges with four equivalent Cu(1)YCu4Sn octahedra, and edges with four equivalent Sn(2)Cu2Sn4 octahedra. The corner-sharing octahedra are not tilted. All Cu(1)-Cu(1) bond lengths are 3.05 Å. The Cu(1)-Sn(2) bond length is 2.61 Å. In the second Cu site, Cu(2) is bonded to four equivalent Cu(2) and two equivalent Sn(1) atoms to form distorted CuCu4Sn2 octahedra that share corners with four equivalent Cu(2)Cu4Sn2 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with eight equivalent Sn(1)YCuSn4 octahedra. The corner-sharing octahedra are not tilted. All Cu(2)-Cu(2) bond lengths are 3.05 Å. Both Cu(2)-Sn(1) bond lengths are 2.53 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Y(1), one Cu(2), and four equivalent Sn(1) atoms to form distorted SnYCuSn4 octahedra that share  a cornercorner with one Cu(1)YCu4Sn octahedra, corners with five equivalent Sn(1)YCuSn4 octahedra, edges with four equivalent Cu(2)Cu4Sn2 octahedra, and edges with four equivalent Sn(1)YCuSn4 octahedra. The corner-sharing octahedra are not tilted. All Sn(1)-Sn(1) bond lengths are 3.05 Å. In the second Sn site, Sn(2) is bonded to two equivalent Cu(1) and four equivalent Sn(2) atoms to form SnCu2Sn4 octahedra that share corners with four equivalent Sn(2)Cu2Sn4 octahedra, edges with four equivalent Sn(2)Cu2Sn4 octahedra, and edges with eight equivalent Cu(1)YCu4Sn octahedra. The corner-sharing octahedra are not tilted. All Sn(2)-Sn(2) bond lengths are 3.05 Å.