Pm3I crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded in a distorted see-saw-like geometry to four equivalent I(1) atoms. I(1) is bonded to twelve equivalent Pm(1) atoms to form a mixture of corner and face-sharing IPm12 cuboctahedra.
Pm3I crystallizes in the hexagonal P6_3/mmc space group. Pm(1) is bonded in a distorted see-saw-like geometry to four equivalent I(1) atoms. There are two shorter (3.53 Å) and two longer (3.54 Å) Pm(1)-I(1) bond lengths. I(1) is bonded to twelve equivalent Pm(1) atoms to form a mixture of corner and face-sharing IPm12 cuboctahedra.