Sm2O2I crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 3-coordinate geometry to one O(2), two equivalent O(1), and five equivalent I(1) atoms. In the second Sm site, Sm(2) is bonded in a 5-coordinate geometry to two equivalent O(1), three equivalent O(2), and two equivalent I(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form a mixture of corner and edge-sharing OSm4 trigonal pyramids. In the second O site, O(2) is bonded to one Sm(1) and three equivalent Sm(2) atoms to form a mixture of distorted corner and edge-sharing OSm4 tetrahedra. I(1) is bonded in a 7-coordinate geometry to two equivalent Sm(2) and five equivalent Sm(1) atoms.
Sm2O2I crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 3-coordinate geometry to one O(2), two equivalent O(1), and five equivalent I(1) atoms. The Sm(1)-O(2) bond length is 2.23 Å. Both Sm(1)-O(1) bond lengths are 2.28 Å. There are a spread of Sm(1)-I(1) bond distances ranging from 3.38-3.83 Å. In the second Sm site, Sm(2) is bonded in a 5-coordinate geometry to two equivalent O(1), three equivalent O(2), and two equivalent I(1) atoms. There is one shorter (2.35 Å) and one longer (2.42 Å) Sm(2)-O(1) bond length. There is one shorter (2.36 Å) and two longer (2.41 Å) Sm(2)-O(2) bond lengths. Both Sm(2)-I(1) bond lengths are 3.43 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1) and two equivalent Sm(2) atoms to form a mixture of corner and edge-sharing OSm4 trigonal pyramids. In the second O site, O(2) is bonded to one Sm(1) and three equivalent Sm(2) atoms to form a mixture of distorted corner and edge-sharing OSm4 tetrahedra. I(1) is bonded in a 7-coordinate geometry to two equivalent Sm(2) and five equivalent Sm(1) atoms.