Yb(CuAl)6 crystallizes in the orthorhombic Immm space group. Yb(1) is bonded in a 20-coordinate geometry to four equivalent Cu(2), eight equivalent Cu(1), two equivalent Al(1), two equivalent Al(2), and four equivalent Al(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Yb(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted edge, face, and corner-sharing CuYb2Al6Cu4 cuboctahedra. In the second Cu site, Cu(2) is bonded to two equivalent Yb(1), four equivalent Cu(1), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted edge, face, and corner-sharing CuYb2Al6Cu4 cuboctahedra. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Yb(1), two equivalent Cu(2), four equivalent Cu(1), one Al(1), and two equivalent Al(3) atoms. In the second Al site, Al(2) is bonded in a 8-coordinate geometry to one Yb(1), two equivalent Cu(2), four equivalent Cu(1), one Al(2), and two equivalent Al(3) atoms. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Yb(1), two equivalent Cu(2), four equivalent Cu(1), two equivalent Al(1), and two equivalent Al(2) atoms.
Yb(CuAl)6 crystallizes in the orthorhombic Immm space group. Yb(1) is bonded in a 20-coordinate geometry to four equivalent Cu(2), eight equivalent Cu(1), two equivalent Al(1), two equivalent Al(2), and four equivalent Al(3) atoms. All Yb(1)-Cu(2) bond lengths are 3.15 Å. All Yb(1)-Cu(1) bond lengths are 3.29 Å. Both Yb(1)-Al(1) bond lengths are 3.04 Å. Both Yb(1)-Al(2) bond lengths are 2.95 Å. All Yb(1)-Al(3) bond lengths are 3.04 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Yb(1), two equivalent Cu(1), two equivalent Cu(2), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted edge, face, and corner-sharing CuYb2Al6Cu4 cuboctahedra. Both Cu(1)-Cu(1) bond lengths are 2.48 Å. Both Cu(1)-Cu(2) bond lengths are 2.51 Å. Both Cu(1)-Al(1) bond lengths are 2.62 Å. Both Cu(1)-Al(2) bond lengths are 2.63 Å. Both Cu(1)-Al(3) bond lengths are 2.50 Å. In the second Cu site, Cu(2) is bonded to two equivalent Yb(1), four equivalent Cu(1), two equivalent Al(1), two equivalent Al(2), and two equivalent Al(3) atoms to form a mixture of distorted edge, face, and corner-sharing CuYb2Al6Cu4 cuboctahedra. Both Cu(2)-Al(1) bond lengths are 2.67 Å. Both Cu(2)-Al(2) bond lengths are 2.67 Å. Both Cu(2)-Al(3) bond lengths are 2.62 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Yb(1), two equivalent Cu(2), four equivalent Cu(1), one Al(1), and two equivalent Al(3) atoms. The Al(1)-Al(1) bond length is 2.62 Å. Both Al(1)-Al(3) bond lengths are 2.79 Å. In the second Al site, Al(2) is bonded in a 8-coordinate geometry to one Yb(1), two equivalent Cu(2), four equivalent Cu(1), one Al(2), and two equivalent Al(3) atoms. The Al(2)-Al(2) bond length is 2.64 Å. Both Al(2)-Al(3) bond lengths are 2.90 Å. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to two equivalent Yb(1), two equivalent Cu(2), four equivalent Cu(1), two equivalent Al(1), and two equivalent Al(2) atoms.