Tm5(Ir2Si5)2 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Si(2), and eight equivalent Si(3) atoms. In the second Tm site, Tm(2) is bonded to four equivalent Ir(1), two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms to form face-sharing TmSi8Ir4 cuboctahedra. In the third Tm site, Tm(3) is bonded in a 14-coordinate geometry to four equivalent Ir(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. Ir(1) is bonded in a 10-coordinate geometry to one Tm(1), two equivalent Tm(2), two equivalent Tm(3), one Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Tm(2), four equivalent Tm(3), two equivalent Ir(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to one Tm(1), two equivalent Tm(2), two equivalent Tm(3), two equivalent Ir(1), and one Si(2) atom. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Tm(2), one Tm(3), two equivalent Tm(1), two equivalent Ir(1), and two equivalent Si(3) atoms.
Tm5(Ir2Si5)2 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Si(2), and eight equivalent Si(3) atoms. All Tm(1)-Ir(1) bond lengths are 3.08 Å. All Tm(1)-Si(2) bond lengths are 3.26 Å. All Tm(1)-Si(3) bond lengths are 2.87 Å. In the second Tm site, Tm(2) is bonded to four equivalent Ir(1), two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms to form face-sharing TmSi8Ir4 cuboctahedra. All Tm(2)-Ir(1) bond lengths are 3.03 Å. Both Tm(2)-Si(1) bond lengths are 2.85 Å. Both Tm(2)-Si(3) bond lengths are 3.02 Å. All Tm(2)-Si(2) bond lengths are 2.93 Å. In the third Tm site, Tm(3) is bonded in a 14-coordinate geometry to four equivalent Ir(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. All Tm(3)-Ir(1) bond lengths are 3.22 Å. Both Tm(3)-Si(3) bond lengths are 3.23 Å. All Tm(3)-Si(1) bond lengths are 3.16 Å. All Tm(3)-Si(2) bond lengths are 3.18 Å. Ir(1) is bonded in a 10-coordinate geometry to one Tm(1), two equivalent Tm(2), two equivalent Tm(3), one Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. The Ir(1)-Si(1) bond length is 2.44 Å. There is one shorter (2.37 Å) and one longer (2.49 Å) Ir(1)-Si(2) bond length. Both Ir(1)-Si(3) bond lengths are 2.39 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Tm(2), four equivalent Tm(3), two equivalent Ir(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.35 Å. In the second Si site, Si(2) is bonded in a 8-coordinate geometry to one Tm(1), two equivalent Tm(2), two equivalent Tm(3), two equivalent Ir(1), and one Si(2) atom. The Si(2)-Si(2) bond length is 2.37 Å. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Tm(2), one Tm(3), two equivalent Tm(1), two equivalent Ir(1), and two equivalent Si(3) atoms. Both Si(3)-Si(3) bond lengths are 2.76 Å.