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DyCu is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Dy is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. All Dy–Cu bond lengths are 3.00 Å. Cu is bonded in a body-centered cubic geometry to eight equivalent Dy atoms.
DyCu5 crystallizes in the cubic F-43m space group. The structure is three-dimensional. Dy is bonded in a 12-coordinate geometry to sixteen Cu atoms. There are twelve shorter (2.91 Å) and four longer (3.04 Å) Dy–Cu bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu is bonded to four equivalent Dy and twelve equivalent Cu atoms to form distorted CuDy4Cu12 tetrahedra that share corners with twelve equivalent CuDy3Cu9 cuboctahedra, faces with twenty-eight equivalent CuDy3Cu9 cuboctahedra, and faces with twelve equivalent CuDy4Cu12 tetrahedra. All Cu–Cu bond lengths are 2.91 Å. In the second Cu site, Cu is bonded to three equivalent Dy and nine Cu atoms to form distorted CuDy3Cu9 cuboctahedra that share corners with eighteen equivalent CuDy3Cu9 cuboctahedra, corners with three equivalent CuDy4Cu12 tetrahedra, edges with six equivalent CuDy3Cu9 cuboctahedra, faces with eighteen equivalent CuDy3Cu9 cuboctahedra, and faces with seven equivalent CuDy4Cu12 tetrahedra. There are three shorter (2.46 Å) and three longer (2.51 Å) Cu–Cu bond lengths.