Rb8In11 crystallizes in the trigonal R-3c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one In(3), two equivalent In(1), and four equivalent In(2) atoms. In the second Rb site, Rb(2) is bonded in a 9-coordinate geometry to three equivalent In(3) and six equivalent In(2) atoms. There are three inequivalent In sites. In the first In site, In(1) is bonded in a distorted q6 geometry to six equivalent Rb(1), three equivalent In(2), and three equivalent In(3) atoms. In the second In site, In(2) is bonded in a 10-coordinate geometry to two equivalent Rb(2), four equivalent Rb(1), one In(1), one In(2), and two equivalent In(3) atoms. In the third In site, In(3) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent In(1), and four equivalent In(2) atoms.
Rb8In11 crystallizes in the trigonal R-3c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one In(3), two equivalent In(1), and four equivalent In(2) atoms. The Rb(1)-In(3) bond length is 3.77 Å. There is one shorter (4.08 Å) and one longer (4.17 Å) Rb(1)-In(1) bond length. There are a spread of Rb(1)-In(2) bond distances ranging from 3.82-4.11 Å. In the second Rb site, Rb(2) is bonded in a 9-coordinate geometry to three equivalent In(3) and six equivalent In(2) atoms. All Rb(2)-In(3) bond lengths are 4.27 Å. There are three shorter (3.93 Å) and three longer (4.19 Å) Rb(2)-In(2) bond lengths. There are three inequivalent In sites. In the first In site, In(1) is bonded in a distorted q6 geometry to six equivalent Rb(1), three equivalent In(2), and three equivalent In(3) atoms. All In(1)-In(2) bond lengths are 3.11 Å. All In(1)-In(3) bond lengths are 3.35 Å. In the second In site, In(2) is bonded in a 10-coordinate geometry to two equivalent Rb(2), four equivalent Rb(1), one In(1), one In(2), and two equivalent In(3) atoms. The In(2)-In(2) bond length is 3.16 Å. There is one shorter (3.03 Å) and one longer (3.11 Å) In(2)-In(3) bond length. In the third In site, In(3) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent In(1), and four equivalent In(2) atoms.