Rb2OI crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) and five equivalent I(1) atoms. In the second Rb site, Rb(2) is bonded in a 2-coordinate geometry to two equivalent O(1) and four equivalent I(1) atoms. O(1) is bonded to two equivalent Rb(2) and three equivalent Rb(1) atoms to form a mixture of corner and edge-sharing ORb5 trigonal bipyramids. I(1) is bonded in a 9-coordinate geometry to four equivalent Rb(2) and five equivalent Rb(1) atoms.
Rb2OI crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) and five equivalent I(1) atoms. There are two shorter (2.91 Å) and one longer (2.92 Å) Rb(1)-O(1) bond length. There are a spread of Rb(1)-I(1) bond distances ranging from 3.91-4.21 Å. In the second Rb site, Rb(2) is bonded in a 2-coordinate geometry to two equivalent O(1) and four equivalent I(1) atoms. There is one shorter (2.67 Å) and one longer (2.82 Å) Rb(2)-O(1) bond length. There are two shorter (3.76 Å) and two longer (3.85 Å) Rb(2)-I(1) bond lengths. O(1) is bonded to two equivalent Rb(2) and three equivalent Rb(1) atoms to form a mixture of corner and edge-sharing ORb5 trigonal bipyramids. I(1) is bonded in a 9-coordinate geometry to four equivalent Rb(2) and five equivalent Rb(1) atoms.