Lu3Cu3Ga8 crystallizes in the orthorhombic Immm space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded to four equivalent Ga(1) and eight equivalent Ga(2) atoms to form LuGa12 cuboctahedra that share edges with two equivalent Cu(1)Lu4Ga4Cu4 cuboctahedra and faces with two equivalent Lu(1)Ga12 cuboctahedra. In the second Lu site, Lu(2) is bonded in a 12-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), four equivalent Ga(1), and four equivalent Ga(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Lu(2), four equivalent Cu(2), and four equivalent Ga(1) atoms to form distorted CuLu4Ga4Cu4 cuboctahedra that share edges with two equivalent Lu(1)Ga12 cuboctahedra and faces with two equivalent Cu(1)Lu4Ga4Cu4 cuboctahedra. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to two equivalent Lu(2), two equivalent Cu(1), two equivalent Ga(2), and four equivalent Ga(1) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Lu(1), two equivalent Lu(2), one Cu(1), two equivalent Cu(2), and three equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Lu(1), two equivalent Lu(2), one Cu(2), one Ga(2), and three equivalent Ga(1) atoms.
Lu3Cu3Ga8 crystallizes in the orthorhombic Immm space group. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded to four equivalent Ga(1) and eight equivalent Ga(2) atoms to form LuGa12 cuboctahedra that share edges with two equivalent Cu(1)Lu4Ga4Cu4 cuboctahedra and faces with two equivalent Lu(1)Ga12 cuboctahedra. All Lu(1)-Ga(1) bond lengths are 3.17 Å. All Lu(1)-Ga(2) bond lengths are 3.11 Å. In the second Lu site, Lu(2) is bonded in a 12-coordinate geometry to two equivalent Cu(1), two equivalent Cu(2), four equivalent Ga(1), and four equivalent Ga(2) atoms. Both Lu(2)-Cu(1) bond lengths are 3.14 Å. Both Lu(2)-Cu(2) bond lengths are 2.98 Å. All Lu(2)-Ga(1) bond lengths are 3.00 Å. All Lu(2)-Ga(2) bond lengths are 3.08 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Lu(2), four equivalent Cu(2), and four equivalent Ga(1) atoms to form distorted CuLu4Ga4Cu4 cuboctahedra that share edges with two equivalent Lu(1)Ga12 cuboctahedra and faces with two equivalent Cu(1)Lu4Ga4Cu4 cuboctahedra. All Cu(1)-Cu(2) bond lengths are 2.82 Å. All Cu(1)-Ga(1) bond lengths are 2.57 Å. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to two equivalent Lu(2), two equivalent Cu(1), two equivalent Ga(2), and four equivalent Ga(1) atoms. Both Cu(2)-Ga(2) bond lengths are 2.51 Å. All Cu(2)-Ga(1) bond lengths are 2.65 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to one Lu(1), two equivalent Lu(2), one Cu(1), two equivalent Cu(2), and three equivalent Ga(2) atoms. There are two shorter (2.60 Å) and one longer (2.69 Å) Ga(1)-Ga(2) bond length. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Lu(1), two equivalent Lu(2), one Cu(2), one Ga(2), and three equivalent Ga(1) atoms. The Ga(2)-Ga(2) bond length is 2.50 Å.