RbI3 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent I(1), four equivalent I(2), and four equivalent I(3) atoms. There are three inequivalent I sites. In the first I site, I(2) is bonded in a 5-coordinate geometry to four equivalent Rb(1) and one I(1) atom. In the second I site, I(1) is bonded to two equivalent Rb(1), one I(2), and one I(3) atom to form distorted corner-sharing IRb2I2 tetrahedra. In the third I site, I(3) is bonded in a 5-coordinate geometry to four equivalent Rb(1) and one I(1) atom.
RbI3 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent I(1), four equivalent I(2), and four equivalent I(3) atoms. Both Rb(1)-I(1) bond lengths are 4.03 Å. There are a spread of Rb(1)-I(2) bond distances ranging from 3.79-4.27 Å. There are a spread of Rb(1)-I(3) bond distances ranging from 3.72-3.82 Å. There are three inequivalent I sites. In the first I site, I(2) is bonded in a 5-coordinate geometry to four equivalent Rb(1) and one I(1) atom. The I(2)-I(1) bond length is 2.88 Å. In the second I site, I(1) is bonded to two equivalent Rb(1), one I(2), and one I(3) atom to form distorted corner-sharing IRb2I2 tetrahedra. The I(1)-I(3) bond length is 3.02 Å. In the third I site, I(3) is bonded in a 5-coordinate geometry to four equivalent Rb(1) and one I(1) atom.