Sm3I crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded in a distorted see-saw-like geometry to four equivalent I(1) atoms. I(1) is bonded to twelve equivalent Sm(1) atoms to form a mixture of corner and face-sharing ISm12 cuboctahedra.
Sm3I crystallizes in the hexagonal P6_3/mmc space group. Sm(1) is bonded in a distorted see-saw-like geometry to four equivalent I(1) atoms. There are two shorter (3.51 Å) and two longer (3.53 Å) Sm(1)-I(1) bond lengths. I(1) is bonded to twelve equivalent Sm(1) atoms to form a mixture of corner and face-sharing ISm12 cuboctahedra.