CeLa(CuSi)4 crystallizes in the tetragonal P4/mmm space group. Ce(1) is bonded in a 16-coordinate geometry to eight equivalent Cu(1) and eight equivalent Si(1) atoms. La(1) is bonded in a 16-coordinate geometry to eight equivalent Cu(1) and eight equivalent Si(2) atoms. Cu(1) is bonded to two equivalent Ce(1), two equivalent La(1), two equivalent Si(1), and two equivalent Si(2) atoms to form a mixture of distorted edge, face, and corner-sharing CuLa2Ce2Si4 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), four equivalent Cu(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent La(1), four equivalent Cu(1), and one Si(2) atom.
CeLa(CuSi)4 crystallizes in the tetragonal P4/mmm space group. Ce(1) is bonded in a 16-coordinate geometry to eight equivalent Cu(1) and eight equivalent Si(1) atoms. All Ce(1)-Cu(1) bond lengths are 3.20 Å. All Ce(1)-Si(1) bond lengths are 3.14 Å. La(1) is bonded in a 16-coordinate geometry to eight equivalent Cu(1) and eight equivalent Si(2) atoms. All La(1)-Cu(1) bond lengths are 3.22 Å. All La(1)-Si(2) bond lengths are 3.15 Å. Cu(1) is bonded to two equivalent Ce(1), two equivalent La(1), two equivalent Si(1), and two equivalent Si(2) atoms to form a mixture of distorted edge, face, and corner-sharing CuLa2Ce2Si4 cuboctahedra. Both Cu(1)-Si(1) bond lengths are 2.42 Å. Both Cu(1)-Si(2) bond lengths are 2.41 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), four equivalent Cu(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.37 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent La(1), four equivalent Cu(1), and one Si(2) atom. The Si(2)-Si(2) bond length is 2.44 Å.