SmPt2Si2 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Pt(1) and eight equivalent Si(1) atoms. Pt(1) is bonded in a 4-coordinate geometry to four equivalent Sm(1) and four equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Pt(1), and one Si(1) atom.
SmPt2Si2 crystallizes in the tetragonal I4/mmm space group. Sm(1) is bonded in a 16-coordinate geometry to eight equivalent Pt(1) and eight equivalent Si(1) atoms. All Sm(1)-Pt(1) bond lengths are 3.26 Å. All Sm(1)-Si(1) bond lengths are 3.22 Å. Pt(1) is bonded in a 4-coordinate geometry to four equivalent Sm(1) and four equivalent Si(1) atoms. All Pt(1)-Si(1) bond lengths are 2.48 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Sm(1), four equivalent Pt(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.37 Å.