Tb3(CuSn)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Cu(2), two equivalent Sn(2), and four equivalent Sn(1) atoms. In the second Tb site, Tb(2) is bonded to two equivalent Sn(2) and four equivalent Sn(1) atoms to form distorted edge-sharing TbSn6 octahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 8-coordinate geometry to three equivalent Tb(1), one Cu(2), one Sn(1), and three equivalent Sn(2) atoms. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to three equivalent Tb(1), one Cu(1), one Sn(1), and three equivalent Sn(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), four equivalent Tb(1), one Cu(1), one Cu(2), and one Sn(1) atom. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Tb(2), two equivalent Tb(1), three equivalent Cu(1), and three equivalent Cu(2) atoms.
Tb3(CuSn)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Cu(2), two equivalent Sn(2), and four equivalent Sn(1) atoms. There are a spread of Tb(1)-Cu(1) bond distances ranging from 3.15-3.18 Å. There are a spread of Tb(1)-Cu(2) bond distances ranging from 3.14-3.20 Å. Both Tb(1)-Sn(2) bond lengths are 3.15 Å. There are three shorter (3.27 Å) and one longer (3.28 Å) Tb(1)-Sn(1) bond length. In the second Tb site, Tb(2) is bonded to two equivalent Sn(2) and four equivalent Sn(1) atoms to form distorted edge-sharing TbSn6 octahedra. Both Tb(2)-Sn(2) bond lengths are 3.18 Å. All Tb(2)-Sn(1) bond lengths are 3.03 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 8-coordinate geometry to three equivalent Tb(1), one Cu(2), one Sn(1), and three equivalent Sn(2) atoms. The Cu(1)-Cu(2) bond length is 2.59 Å. The Cu(1)-Sn(1) bond length is 2.62 Å. There are a spread of Cu(1)-Sn(2) bond distances ranging from 2.66-2.74 Å. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to three equivalent Tb(1), one Cu(1), one Sn(1), and three equivalent Sn(2) atoms. The Cu(2)-Sn(1) bond length is 2.61 Å. There are a spread of Cu(2)-Sn(2) bond distances ranging from 2.66-2.73 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Tb(2), four equivalent Tb(1), one Cu(1), one Cu(2), and one Sn(1) atom. The Sn(1)-Sn(1) bond length is 2.80 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Tb(2), two equivalent Tb(1), three equivalent Cu(1), and three equivalent Cu(2) atoms.