TmSn3 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to two equivalent Sn(1), two equivalent Sn(3), two equivalent Sn(5), two equivalent Sn(6), and four equivalent Sn(4) atoms to form TmSn12 cuboctahedra that share corners with four equivalent Tm(1)Sn12 cuboctahedra, corners with two equivalent Sn(2)Tm4Sn square pyramids, and faces with four equivalent Tm(1)Sn12 cuboctahedra. In the second Tm site, Tm(2) is bonded in a 9-coordinate geometry to one Sn(5), two equivalent Sn(1), two equivalent Sn(6), and four equivalent Sn(2) atoms. There are six inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Sn(6) atoms. In the second Sn site, Sn(2) is bonded to four equivalent Tm(2) and one Sn(3) atom to form distorted SnTm4Sn square pyramids that share corners with two equivalent Tm(1)Sn12 cuboctahedra, corners with four equivalent Sn(2)Tm4Sn square pyramids, and edges with four equivalent Sn(2)Tm4Sn square pyramids. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to two equivalent Tm(1), one Sn(2), two equivalent Sn(4), and four equivalent Sn(5) atoms. In the fourth Sn site, Sn(4) is bonded in a rectangular see-saw-like geometry to four equivalent Tm(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. In the fifth Sn site, Sn(5) is bonded in a 9-coordinate geometry to one Tm(2), two equivalent Tm(1), two equivalent Sn(4), and four equivalent Sn(3) atoms. In the sixth Sn site, Sn(6) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Sn(1) atoms.
TmSn3 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to two equivalent Sn(1), two equivalent Sn(3), two equivalent Sn(5), two equivalent Sn(6), and four equivalent Sn(4) atoms to form TmSn12 cuboctahedra that share corners with four equivalent Tm(1)Sn12 cuboctahedra, corners with two equivalent Sn(2)Tm4Sn square pyramids, and faces with four equivalent Tm(1)Sn12 cuboctahedra. Both Tm(1)-Sn(1) bond lengths are 3.39 Å. Both Tm(1)-Sn(3) bond lengths are 3.40 Å. Both Tm(1)-Sn(5) bond lengths are 3.44 Å. Both Tm(1)-Sn(6) bond lengths are 3.42 Å. All Tm(1)-Sn(4) bond lengths are 3.13 Å. In the second Tm site, Tm(2) is bonded in a 9-coordinate geometry to one Sn(5), two equivalent Sn(1), two equivalent Sn(6), and four equivalent Sn(2) atoms. The Tm(2)-Sn(5) bond length is 3.30 Å. Both Tm(2)-Sn(1) bond lengths are 3.35 Å. Both Tm(2)-Sn(6) bond lengths are 3.32 Å. All Tm(2)-Sn(2) bond lengths are 3.14 Å. There are six inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Sn(6) atoms. All Sn(1)-Sn(6) bond lengths are 3.12 Å. In the second Sn site, Sn(2) is bonded to four equivalent Tm(2) and one Sn(3) atom to form distorted SnTm4Sn square pyramids that share corners with two equivalent Tm(1)Sn12 cuboctahedra, corners with four equivalent Sn(2)Tm4Sn square pyramids, and edges with four equivalent Sn(2)Tm4Sn square pyramids. The Sn(2)-Sn(3) bond length is 3.01 Å. In the third Sn site, Sn(3) is bonded in a 9-coordinate geometry to two equivalent Tm(1), one Sn(2), two equivalent Sn(4), and four equivalent Sn(5) atoms. Both Sn(3)-Sn(4) bond lengths are 3.31 Å. All Sn(3)-Sn(5) bond lengths are 3.12 Å. In the fourth Sn site, Sn(4) is bonded in a rectangular see-saw-like geometry to four equivalent Tm(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. Both Sn(4)-Sn(5) bond lengths are 3.33 Å. In the fifth Sn site, Sn(5) is bonded in a 9-coordinate geometry to one Tm(2), two equivalent Tm(1), two equivalent Sn(4), and four equivalent Sn(3) atoms. In the sixth Sn site, Sn(6) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Sn(1) atoms.