Tm3Os4Ge13 crystallizes in the cubic Pm-3n space group. Tm(1) is bonded in a 16-coordinate geometry to four equivalent Os(1) and twelve equivalent Ge(2) atoms. Os(1) is bonded in a 9-coordinate geometry to three equivalent Tm(1) and six equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 2-coordinate geometry to three equivalent Tm(1), two equivalent Os(1), and one Ge(1) atom. In the second Ge site, Ge(1) is bonded in a cuboctahedral geometry to twelve equivalent Ge(2) atoms.
Tm3Os4Ge13 crystallizes in the cubic Pm-3n space group. Tm(1) is bonded in a 16-coordinate geometry to four equivalent Os(1) and twelve equivalent Ge(2) atoms. All Tm(1)-Os(1) bond lengths are 3.20 Å. There are eight shorter (3.18 Å) and four longer (3.24 Å) Tm(1)-Ge(2) bond lengths. Os(1) is bonded in a 9-coordinate geometry to three equivalent Tm(1) and six equivalent Ge(2) atoms. All Os(1)-Ge(2) bond lengths are 2.50 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(2) is bonded in a 2-coordinate geometry to three equivalent Tm(1), two equivalent Os(1), and one Ge(1) atom. The Ge(2)-Ge(1) bond length is 3.02 Å. In the second Ge site, Ge(1) is bonded in a cuboctahedral geometry to twelve equivalent Ge(2) atoms.