GdCu2Sn2 crystallizes in the tetragonal P4/nmm space group. Gd(1) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), four equivalent Sn(1), and four equivalent Sn(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 8-coordinate geometry to four equivalent Gd(1) and four equivalent Sn(2) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Sn(2), and four equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to four equivalent Gd(1) and four equivalent Cu(2) atoms to form a mixture of distorted edge and face-sharing SnGd4Cu4 tetrahedra. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Cu(2), and four equivalent Cu(1) atoms.
GdCu2Sn2 crystallizes in the tetragonal P4/nmm space group. Gd(1) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(2), four equivalent Sn(1), and four equivalent Sn(2) atoms. All Gd(1)-Cu(1) bond lengths are 3.35 Å. All Gd(1)-Cu(2) bond lengths are 3.36 Å. All Gd(1)-Sn(1) bond lengths are 3.56 Å. All Gd(1)-Sn(2) bond lengths are 3.30 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 8-coordinate geometry to four equivalent Gd(1) and four equivalent Sn(2) atoms. All Cu(1)-Sn(2) bond lengths are 2.58 Å. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Sn(2), and four equivalent Sn(1) atoms. The Cu(2)-Sn(2) bond length is 2.49 Å. All Cu(2)-Sn(1) bond lengths are 2.64 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to four equivalent Gd(1) and four equivalent Cu(2) atoms to form a mixture of distorted edge and face-sharing SnGd4Cu4 tetrahedra. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Cu(2), and four equivalent Cu(1) atoms.