Tm(RhSi)2 crystallizes in the tetragonal I4/mmm space group. Tm(1) is bonded in a 16-coordinate geometry to eight equivalent Rh(1) and eight equivalent Si(1) atoms. Rh(1) is bonded to four equivalent Tm(1) and four equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing RhTm4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Tm(1), four equivalent Rh(1), and one Si(1) atom.
Tm(RhSi)2 crystallizes in the tetragonal I4/mmm space group. Tm(1) is bonded in a 16-coordinate geometry to eight equivalent Rh(1) and eight equivalent Si(1) atoms. All Tm(1)-Rh(1) bond lengths are 3.18 Å. All Tm(1)-Si(1) bond lengths are 3.08 Å. Rh(1) is bonded to four equivalent Tm(1) and four equivalent Si(1) atoms to form a mixture of distorted corner, face, and edge-sharing RhTm4Si4 tetrahedra. All Rh(1)-Si(1) bond lengths are 2.38 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Tm(1), four equivalent Rh(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.39 Å.