Rb2ZnI4 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one I(4), two equivalent I(1), two equivalent I(2), and three equivalent I(3) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one I(3), two equivalent I(1), two equivalent I(2), and three equivalent I(4) atoms. Zn(1) is bonded in a tetrahedral geometry to one I(1), one I(2), one I(3), and one I(4) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 5-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), and one Zn(1) atom. In the second I site, I(2) is bonded to two equivalent Rb(1), two equivalent Rb(2), and one Zn(1) atom to form distorted corner-sharing IRb4Zn square pyramids. In the third I site, I(3) is bonded in a 1-coordinate geometry to one Rb(2), three equivalent Rb(1), and one Zn(1) atom. In the fourth I site, I(4) is bonded in a 1-coordinate geometry to one Rb(1), three equivalent Rb(2), and one Zn(1) atom.
Rb2ZnI4 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one I(4), two equivalent I(1), two equivalent I(2), and three equivalent I(3) atoms. The Rb(1)-I(4) bond length is 3.65 Å. There is one shorter (3.76 Å) and one longer (3.83 Å) Rb(1)-I(1) bond length. There is one shorter (3.74 Å) and one longer (3.85 Å) Rb(1)-I(2) bond length. There are a spread of Rb(1)-I(3) bond distances ranging from 3.79-4.23 Å. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one I(3), two equivalent I(1), two equivalent I(2), and three equivalent I(4) atoms. The Rb(2)-I(3) bond length is 3.83 Å. There is one shorter (3.79 Å) and one longer (3.80 Å) Rb(2)-I(1) bond length. There is one shorter (3.79 Å) and one longer (3.82 Å) Rb(2)-I(2) bond length. There are a spread of Rb(2)-I(4) bond distances ranging from 3.75-4.32 Å. Zn(1) is bonded in a tetrahedral geometry to one I(1), one I(2), one I(3), and one I(4) atom. The Zn(1)-I(1) bond length is 2.62 Å. The Zn(1)-I(2) bond length is 2.62 Å. The Zn(1)-I(3) bond length is 2.63 Å. The Zn(1)-I(4) bond length is 2.61 Å. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 5-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), and one Zn(1) atom. In the second I site, I(2) is bonded to two equivalent Rb(1), two equivalent Rb(2), and one Zn(1) atom to form distorted corner-sharing IRb4Zn square pyramids. In the third I site, I(3) is bonded in a 1-coordinate geometry to one Rb(2), three equivalent Rb(1), and one Zn(1) atom. In the fourth I site, I(4) is bonded in a 1-coordinate geometry to one Rb(1), three equivalent Rb(2), and one Zn(1) atom.