Tb4Cu7Sn11 crystallizes in the tetragonal P4mm space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to four equivalent Cu(4), four equivalent Sn(3), and four equivalent Sn(6) atoms to form a mixture of corner and face-sharing TbCu4Sn8 cuboctahedra. In the second Tb site, Tb(2) is bonded to one Cu(3), four equivalent Cu(5), four equivalent Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted corner and face-sharing TbCu5Sn8 cuboctahedra. In the third Tb site, Tb(3) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(4), four equivalent Sn(1), and four equivalent Sn(7) atoms. In the fourth Tb site, Tb(4) is bonded in a 16-coordinate geometry to four equivalent Cu(2), four equivalent Cu(3), four equivalent Cu(5), and four equivalent Sn(2) atoms. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to four equivalent Tb(3), one Sn(7), and four equivalent Sn(1) atoms. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent Tb(4), one Cu(3), and four equivalent Sn(2) atoms. In the third Cu site, Cu(3) is bonded in a 10-coordinate geometry to one Tb(2), four equivalent Tb(4), one Cu(2), and four equivalent Cu(5) atoms. In the fourth Cu site, Cu(4) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(3), two equivalent Sn(3), and two equivalent Sn(7) atoms. In the fifth Cu site, Cu(5) is bonded in a 8-coordinate geometry to two equivalent Tb(2), two equivalent Tb(4), two equivalent Cu(3), and two equivalent Sn(4) atoms. There are seven inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Tb(3), two equivalent Cu(1), one Sn(5), and four equivalent Sn(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Tb(4), two equivalent Cu(2), one Sn(6), and four equivalent Sn(2) atoms. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Cu(4) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Tb(2) and four equivalent Cu(5) atoms. In the fifth Sn site, Sn(5) is bonded in a 7-coordinate geometry to two equivalent Tb(2), one Sn(1), and four equivalent Sn(5) atoms. In the sixth Sn site, Sn(6) is bonded in a 7-coordinate geometry to two equivalent Tb(1), one Sn(2), and four equivalent Sn(6) atoms. In the seventh Sn site, Sn(7) is bonded in a 9-coordinate geometry to four equivalent Tb(3), one Cu(1), and four equivalent Cu(4) atoms.
Tb4Cu7Sn11 crystallizes in the tetragonal P4mm space group. There are four inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to four equivalent Cu(4), four equivalent Sn(3), and four equivalent Sn(6) atoms to form a mixture of corner and face-sharing TbCu4Sn8 cuboctahedra. All Tb(1)-Cu(4) bond lengths are 3.09 Å. All Tb(1)-Sn(3) bond lengths are 3.19 Å. All Tb(1)-Sn(6) bond lengths are 3.26 Å. In the second Tb site, Tb(2) is bonded to one Cu(3), four equivalent Cu(5), four equivalent Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted corner and face-sharing TbCu5Sn8 cuboctahedra. The Tb(2)-Cu(3) bond length is 3.35 Å. All Tb(2)-Cu(5) bond lengths are 3.16 Å. All Tb(2)-Sn(4) bond lengths are 3.23 Å. All Tb(2)-Sn(5) bond lengths are 3.26 Å. In the third Tb site, Tb(3) is bonded in a 16-coordinate geometry to four equivalent Cu(1), four equivalent Cu(4), four equivalent Sn(1), and four equivalent Sn(7) atoms. All Tb(3)-Cu(1) bond lengths are 3.39 Å. All Tb(3)-Cu(4) bond lengths are 3.33 Å. All Tb(3)-Sn(1) bond lengths are 3.49 Å. All Tb(3)-Sn(7) bond lengths are 3.33 Å. In the fourth Tb site, Tb(4) is bonded in a 16-coordinate geometry to four equivalent Cu(2), four equivalent Cu(3), four equivalent Cu(5), and four equivalent Sn(2) atoms. All Tb(4)-Cu(2) bond lengths are 3.36 Å. All Tb(4)-Cu(3) bond lengths are 3.32 Å. All Tb(4)-Cu(5) bond lengths are 3.12 Å. All Tb(4)-Sn(2) bond lengths are 3.51 Å. There are five inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 9-coordinate geometry to four equivalent Tb(3), one Sn(7), and four equivalent Sn(1) atoms. The Cu(1)-Sn(7) bond length is 2.47 Å. All Cu(1)-Sn(1) bond lengths are 2.61 Å. In the second Cu site, Cu(2) is bonded in a 9-coordinate geometry to four equivalent Tb(4), one Cu(3), and four equivalent Sn(2) atoms. The Cu(2)-Cu(3) bond length is 2.36 Å. All Cu(2)-Sn(2) bond lengths are 2.66 Å. In the third Cu site, Cu(3) is bonded in a 10-coordinate geometry to one Tb(2), four equivalent Tb(4), one Cu(2), and four equivalent Cu(5) atoms. All Cu(3)-Cu(5) bond lengths are 2.46 Å. In the fourth Cu site, Cu(4) is bonded in a 8-coordinate geometry to two equivalent Tb(1), two equivalent Tb(3), two equivalent Sn(3), and two equivalent Sn(7) atoms. Both Cu(4)-Sn(3) bond lengths are 2.69 Å. Both Cu(4)-Sn(7) bond lengths are 2.59 Å. In the fifth Cu site, Cu(5) is bonded in a 8-coordinate geometry to two equivalent Tb(2), two equivalent Tb(4), two equivalent Cu(3), and two equivalent Sn(4) atoms. Both Cu(5)-Sn(4) bond lengths are 2.64 Å. There are seven inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Tb(3), two equivalent Cu(1), one Sn(5), and four equivalent Sn(1) atoms. The Sn(1)-Sn(5) bond length is 2.92 Å. All Sn(1)-Sn(1) bond lengths are 3.12 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Tb(4), two equivalent Cu(2), one Sn(6), and four equivalent Sn(2) atoms. The Sn(2)-Sn(6) bond length is 2.97 Å. All Sn(2)-Sn(2) bond lengths are 3.12 Å. In the third Sn site, Sn(3) is bonded in a 8-coordinate geometry to four equivalent Tb(1) and four equivalent Cu(4) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Tb(2) and four equivalent Cu(5) atoms. In the fifth Sn site, Sn(5) is bonded in a 7-coordinate geometry to two equivalent Tb(2), one Sn(1), and four equivalent Sn(5) atoms. All Sn(5)-Sn(5) bond lengths are 3.12 Å. In the sixth Sn site, Sn(6) is bonded in a 7-coordinate geometry to two equivalent Tb(1), one Sn(2), and four equivalent Sn(6) atoms. All Sn(6)-Sn(6) bond lengths are 3.12 Å. In the seventh Sn site, Sn(7) is bonded in a 9-coordinate geometry to four equivalent Tb(3), one Cu(1), and four equivalent Cu(4) atoms.