YCu3CdSe4 crystallizes in the cubic P-43m space group. Y(1) is bonded to six equivalent Cu(1) and four equivalent Se(1) atoms to form distorted YCu6Se4 tetrahedra that share corners with four equivalent Cd(1)Se4 tetrahedra, corners with six equivalent Y(1)Cu6Se4 tetrahedra, and edges with six equivalent Cu(1)Y2Se4 tetrahedra. Cu(1) is bonded to two equivalent Y(1) and four equivalent Se(1) atoms to form distorted CuY2Se4 tetrahedra that share corners with two equivalent Cu(1)Y2Se4 tetrahedra, corners with four equivalent Cd(1)Se4 tetrahedra, edges with two equivalent Y(1)Cu6Se4 tetrahedra, and edges with eight equivalent Cu(1)Y2Se4 tetrahedra. Cd(1) is bonded to four equivalent Se(1) atoms to form CdSe4 tetrahedra that share corners with four equivalent Y(1)Cu6Se4 tetrahedra and corners with twelve equivalent Cu(1)Y2Se4 tetrahedra. Se(1) is bonded in a distorted pentagonal planar geometry to one Y(1), three equivalent Cu(1), and one Cd(1) atom.
YCu3CdSe4 crystallizes in the cubic P-43m space group. Y(1) is bonded to six equivalent Cu(1) and four equivalent Se(1) atoms to form distorted YCu6Se4 tetrahedra that share corners with four equivalent Cd(1)Se4 tetrahedra, corners with six equivalent Y(1)Cu6Se4 tetrahedra, and edges with six equivalent Cu(1)Y2Se4 tetrahedra. All Y(1)-Cu(1) bond lengths are 3.03 Å. All Y(1)-Se(1) bond lengths are 2.63 Å. Cu(1) is bonded to two equivalent Y(1) and four equivalent Se(1) atoms to form distorted CuY2Se4 tetrahedra that share corners with two equivalent Cu(1)Y2Se4 tetrahedra, corners with four equivalent Cd(1)Se4 tetrahedra, edges with two equivalent Y(1)Cu6Se4 tetrahedra, and edges with eight equivalent Cu(1)Y2Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.62 Å. Cd(1) is bonded to four equivalent Se(1) atoms to form CdSe4 tetrahedra that share corners with four equivalent Y(1)Cu6Se4 tetrahedra and corners with twelve equivalent Cu(1)Y2Se4 tetrahedra. All Cd(1)-Se(1) bond lengths are 2.62 Å. Se(1) is bonded in a distorted pentagonal planar geometry to one Y(1), three equivalent Cu(1), and one Cd(1) atom.