Sm(RhSi)2 crystallizes in the tetragonal I4/mmm space group. Sm(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 Sm(1) and four equivalent Si(1) atoms to form a mixture of distorted edge, corner, and face-sharing RhSm4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Rh(1), and one Si(1) atom.
Sm(RhSi)2 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Rh(1) and eight equivalent Si(1) atoms. All Sm(1)-Rh(1) bond lengths are 3.23 Å. All Sm(1)-Si(1) bond lengths are 3.14 Å. Rh(1) is bonded to four equivalent Sm(1) and four equivalent Si(1) atoms to form a mixture of distorted edge, corner, and face-sharing RhSm4Si4 tetrahedra. All Rh(1)-Si(1) bond lengths are 2.40 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Rh(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.49 Å.