Tm4Mn4Sn7 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one Sn(4), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form a mixture of distorted edge, face, and corner-sharing TmSn7 pentagonal bipyramids. In the second Tm site, Tm(2) is bonded in a 7-coordinate geometry to two equivalent Sn(2), two equivalent Sn(3), and three equivalent Sn(1) atoms. Mn(1) is bonded in a 6-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(4) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Tm(1), three equivalent Tm(2), and four equivalent Mn(1) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Mn(1) atoms. In the third Sn site, Sn(3) is bonded in a 10-coordinate geometry to four equivalent Tm(1), four equivalent Tm(2), and two equivalent Sn(3) atoms. In the fourth Sn site, Sn(4) is bonded in a 6-coordinate geometry to one Tm(1), four equivalent Mn(1), and one Sn(4) atom.
Tm4Mn4Sn7 crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one Sn(4), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(3) atoms to form a mixture of distorted edge, face, and corner-sharing TmSn7 pentagonal bipyramids. The Tm(1)-Sn(4) bond length is 3.13 Å. Both Tm(1)-Sn(1) bond lengths are 3.05 Å. Both Tm(1)-Sn(2) bond lengths are 3.23 Å. Both Tm(1)-Sn(3) bond lengths are 3.24 Å. In the second Tm site, Tm(2) is bonded in a 7-coordinate geometry to two equivalent Sn(2), two equivalent Sn(3), and three equivalent Sn(1) atoms. Both Tm(2)-Sn(2) bond lengths are 3.04 Å. Both Tm(2)-Sn(3) bond lengths are 3.28 Å. There are two shorter (3.21 Å) and one longer (3.33 Å) Tm(2)-Sn(1) bond length. Mn(1) is bonded in a 6-coordinate geometry to two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(4) atoms. Both Mn(1)-Sn(1) bond lengths are 2.75 Å. Both Mn(1)-Sn(2) bond lengths are 2.83 Å. Both Mn(1)-Sn(4) bond lengths are 2.79 Å. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Tm(1), three equivalent Tm(2), and four equivalent Mn(1) atoms. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Mn(1) atoms. In the third Sn site, Sn(3) is bonded in a 10-coordinate geometry to four equivalent Tm(1), four equivalent Tm(2), and two equivalent Sn(3) atoms. There is one shorter (2.90 Å) and one longer (2.91 Å) Sn(3)-Sn(3) bond length. In the fourth Sn site, Sn(4) is bonded in a 6-coordinate geometry to one Tm(1), four equivalent Mn(1), and one Sn(4) atom. The Sn(4)-Sn(4) bond length is 2.90 Å.