RbSrI3 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent I(2) and six equivalent I(1) atoms. Sr(1) is bonded to two equivalent I(2) and four equivalent I(1) atoms to form a mixture of edge and corner-sharing SrI6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are two inequivalent I sites. In the first I site, I(1) is bonded in a 5-coordinate geometry to three equivalent Rb(1) and two equivalent Sr(1) atoms. In the second I site, I(2) is bonded to two equivalent Rb(1) and two equivalent Sr(1) atoms to form distorted corner-sharing IRb2Sr2 tetrahedra.
RbSrI3 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent I(2) and six equivalent I(1) atoms. Both Rb(1)-I(2) bond lengths are 3.66 Å. There are four shorter (3.81 Å) and two longer (4.13 Å) Rb(1)-I(1) bond lengths. Sr(1) is bonded to two equivalent I(2) and four equivalent I(1) atoms to form a mixture of edge and corner-sharing SrI6 octahedra. The corner-sharing octahedral tilt angles are 43°. Both Sr(1)-I(2) bond lengths are 3.26 Å. All Sr(1)-I(1) bond lengths are 3.31 Å. There are two inequivalent I sites. In the first I site, I(1) is bonded in a 5-coordinate geometry to three equivalent Rb(1) and two equivalent Sr(1) atoms. In the second I site, I(2) is bonded to two equivalent Rb(1) and two equivalent Sr(1) atoms to form distorted corner-sharing IRb2Sr2 tetrahedra.