Sr(OI)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent I(2), and three equivalent I(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one O(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one O(1) atom. There are two inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to three equivalent Sr(1) and one I(2) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one I(1), and one I(2) atom.
Sr(OI)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 4-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent I(2), and three equivalent I(1) atoms. Both Sr(1)-O(1) bond lengths are 2.51 Å. There is one shorter (2.51 Å) and one longer (2.52 Å) Sr(1)-O(2) bond length. There is one shorter (3.66 Å) and one longer (3.73 Å) Sr(1)-I(2) bond length. There are a spread of Sr(1)-I(1) bond distances ranging from 3.47-3.89 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one O(2) atom. The O(1)-O(2) bond length is 1.38 Å. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one O(1) atom. There are two inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to three equivalent Sr(1) and one I(2) atom. The I(1)-I(2) bond length is 3.30 Å. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one I(1), and one I(2) atom. The I(2)-I(2) bond length is 2.90 Å.