Ta2Cr3Cu crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded in a 16-coordinate geometry to four equivalent Ta(1), nine equivalent Cr(1), and three equivalent Cu(1) atoms. Cr(1) is bonded to six equivalent Ta(1), four equivalent Cr(1), and two equivalent Cu(1) atoms to form distorted CrTa6Cr4Cu2 cuboctahedra that share corners with four equivalent Cu(1)Ta6Cr6 cuboctahedra, corners with fourteen equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra, edges with six equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra, faces with six equivalent Cu(1)Ta6Cr6 cuboctahedra, and faces with twelve equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra. Cu(1) is bonded to six equivalent Ta(1) and six equivalent Cr(1) atoms to form CuTa6Cr6 cuboctahedra that share corners with twelve equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra, edges with six equivalent Cu(1)Ta6Cr6 cuboctahedra, faces with two equivalent Cu(1)Ta6Cr6 cuboctahedra, and faces with eighteen equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra.
Ta2Cr3Cu crystallizes in the hexagonal P6_3/mmc space group. Ta(1) is bonded in a 16-coordinate geometry to four equivalent Ta(1), nine equivalent Cr(1), and three equivalent Cu(1) atoms. There are three shorter (2.98 Å) and one longer (3.06 Å) Ta(1)-Ta(1) bond length. There are six shorter (2.84 Å) and three longer (2.96 Å) Ta(1)-Cr(1) bond lengths. All Ta(1)-Cu(1) bond lengths are 2.82 Å. Cr(1) is bonded to six equivalent Ta(1), four equivalent Cr(1), and two equivalent Cu(1) atoms to form distorted CrTa6Cr4Cu2 cuboctahedra that share corners with four equivalent Cu(1)Ta6Cr6 cuboctahedra, corners with fourteen equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra, edges with six equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra, faces with six equivalent Cu(1)Ta6Cr6 cuboctahedra, and faces with twelve equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra. There are two shorter (2.33 Å) and two longer (2.46 Å) Cr(1)-Cr(1) bond lengths. Both Cr(1)-Cu(1) bond lengths are 2.52 Å. Cu(1) is bonded to six equivalent Ta(1) and six equivalent Cr(1) atoms to form CuTa6Cr6 cuboctahedra that share corners with twelve equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra, edges with six equivalent Cu(1)Ta6Cr6 cuboctahedra, faces with two equivalent Cu(1)Ta6Cr6 cuboctahedra, and faces with eighteen equivalent Cr(1)Ta6Cr4Cu2 cuboctahedra.