TaVCu crystallizes in the orthorhombic Imma space group. Ta(1) is bonded in a 16-coordinate geometry to four equivalent Ta(1), six equivalent V(1), and six equivalent Cu(1) atoms. V(1) is bonded to six equivalent Ta(1), two equivalent V(1), and four equivalent Cu(1) atoms to form distorted VTa6V2Cu4 cuboctahedra that share corners with eight equivalent Cu(1)Ta6V4Cu2 cuboctahedra, corners with ten equivalent V(1)Ta6V2Cu4 cuboctahedra, edges with six equivalent V(1)Ta6V2Cu4 cuboctahedra, faces with six equivalent V(1)Ta6V2Cu4 cuboctahedra, and faces with twelve equivalent Cu(1)Ta6V4Cu2 cuboctahedra. Cu(1) is bonded to six equivalent Ta(1), four equivalent V(1), and two equivalent Cu(1) atoms to form CuTa6V4Cu2 cuboctahedra that share corners with eight equivalent V(1)Ta6V2Cu4 cuboctahedra, corners with ten equivalent Cu(1)Ta6V4Cu2 cuboctahedra, edges with six equivalent Cu(1)Ta6V4Cu2 cuboctahedra, faces with six equivalent Cu(1)Ta6V4Cu2 cuboctahedra, and faces with twelve equivalent V(1)Ta6V2Cu4 cuboctahedra.
TaVCu crystallizes in the orthorhombic Imma space group. Ta(1) is bonded in a 16-coordinate geometry to four equivalent Ta(1), six equivalent V(1), and six equivalent Cu(1) atoms. There are two shorter (3.04 Å) and two longer (3.07 Å) Ta(1)-Ta(1) bond lengths. There are two shorter (2.93 Å) and four longer (2.95 Å) Ta(1)-V(1) bond lengths. There are four shorter (2.84 Å) and two longer (3.01 Å) Ta(1)-Cu(1) bond lengths. V(1) is bonded to six equivalent Ta(1), two equivalent V(1), and four equivalent Cu(1) atoms to form distorted VTa6V2Cu4 cuboctahedra that share corners with eight equivalent Cu(1)Ta6V4Cu2 cuboctahedra, corners with ten equivalent V(1)Ta6V2Cu4 cuboctahedra, edges with six equivalent V(1)Ta6V2Cu4 cuboctahedra, faces with six equivalent V(1)Ta6V2Cu4 cuboctahedra, and faces with twelve equivalent Cu(1)Ta6V4Cu2 cuboctahedra. Both V(1)-V(1) bond lengths are 2.40 Å. All V(1)-Cu(1) bond lengths are 2.51 Å. Cu(1) is bonded to six equivalent Ta(1), four equivalent V(1), and two equivalent Cu(1) atoms to form CuTa6V4Cu2 cuboctahedra that share corners with eight equivalent V(1)Ta6V2Cu4 cuboctahedra, corners with ten equivalent Cu(1)Ta6V4Cu2 cuboctahedra, edges with six equivalent Cu(1)Ta6V4Cu2 cuboctahedra, faces with six equivalent Cu(1)Ta6V4Cu2 cuboctahedra, and faces with twelve equivalent V(1)Ta6V2Cu4 cuboctahedra. Both Cu(1)-Cu(1) bond lengths are 2.53 Å.