Tm11Ge10 is delta Molybdenum Boride-like structured and crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one Ge(1), one Ge(2), one Ge(4), and four equivalent Ge(5) atoms to form a mixture of distorted corner, edge, and face-sharing TmGe7 pentagonal bipyramids. In the second Tm site, Tm(2) is bonded in a 7-coordinate geometry to one Ge(3), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(5) atoms. In the third Tm site, Tm(3) is bonded in a 9-coordinate geometry to one Ge(2), four equivalent Ge(3), and four equivalent Ge(5) atoms. In the fourth Tm site, Tm(4) is bonded in a 7-coordinate geometry to one Ge(4), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(5) atoms. There are five inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Tm(4) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Tm(3), four equivalent Tm(1), and four equivalent Tm(2) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Tm(2), two equivalent Tm(3), four equivalent Tm(4), and two equivalent Ge(3) atoms. In the fourth Ge site, Ge(4) is bonded in a 8-coordinate geometry to four equivalent Tm(1) and four equivalent Tm(4) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to one Tm(2), one Tm(3), two equivalent Tm(4), four equivalent Tm(1), and one Ge(5) atom.
Tm11Ge10 is delta Molybdenum Boride-like structured and crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one Ge(1), one Ge(2), one Ge(4), and four equivalent Ge(5) atoms to form a mixture of distorted corner, edge, and face-sharing TmGe7 pentagonal bipyramids. The Tm(1)-Ge(1) bond length is 3.26 Å. The Tm(1)-Ge(2) bond length is 2.96 Å. The Tm(1)-Ge(4) bond length is 2.83 Å. There are two shorter (3.08 Å) and two longer (3.16 Å) Tm(1)-Ge(5) bond lengths. In the second Tm site, Tm(2) is bonded in a 7-coordinate geometry to one Ge(3), two equivalent Ge(1), two equivalent Ge(2), and two equivalent Ge(5) atoms. The Tm(2)-Ge(3) bond length is 3.07 Å. Both Tm(2)-Ge(1) bond lengths are 2.71 Å. Both Tm(2)-Ge(2) bond lengths are 3.27 Å. Both Tm(2)-Ge(5) bond lengths are 3.40 Å. In the third Tm site, Tm(3) is bonded in a 9-coordinate geometry to one Ge(2), four equivalent Ge(3), and four equivalent Ge(5) atoms. The Tm(3)-Ge(2) bond length is 3.60 Å. All Tm(3)-Ge(3) bond lengths are 3.16 Å. All Tm(3)-Ge(5) bond lengths are 3.18 Å. In the fourth Tm site, Tm(4) is bonded in a 7-coordinate geometry to one Ge(4), two equivalent Ge(1), two equivalent Ge(3), and two equivalent Ge(5) atoms. The Tm(4)-Ge(4) bond length is 3.04 Å. Both Tm(4)-Ge(1) bond lengths are 2.93 Å. Both Tm(4)-Ge(3) bond lengths are 3.02 Å. Both Tm(4)-Ge(5) bond lengths are 2.87 Å. There are five inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), and four equivalent Tm(4) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Tm(3), four equivalent Tm(1), and four equivalent Tm(2) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Tm(2), two equivalent Tm(3), four equivalent Tm(4), and two equivalent Ge(3) atoms. Both Ge(3)-Ge(3) bond lengths are 2.59 Å. In the fourth Ge site, Ge(4) is bonded in a 8-coordinate geometry to four equivalent Tm(1) and four equivalent Tm(4) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to one Tm(2), one Tm(3), two equivalent Tm(4), four equivalent Tm(1), and one Ge(5) atom. The Ge(5)-Ge(5) bond length is 2.55 Å.