Rb6C5 crystallizes in the hexagonal P-62m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one C(2) and four equivalent C(1) atoms. In the second Rb site, Rb(2) is bonded in a distorted rectangular see-saw-like geometry to four equivalent C(1) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded to three equivalent Rb(1) and three equivalent Rb(2) atoms to form a mixture of corner, edge, and face-sharing CRb6 octahedra. The corner-sharing octahedral tilt angles range from 34-40°. In the second C site, C(2) is bonded in a trigonal planar geometry to three equivalent Rb(1) atoms.
Rb6C5 crystallizes in the hexagonal P-62m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one C(2) and four equivalent C(1) atoms. The Rb(1)-C(2) bond length is 2.99 Å. All Rb(1)-C(1) bond lengths are 3.18 Å. In the second Rb site, Rb(2) is bonded in a distorted rectangular see-saw-like geometry to four equivalent C(1) atoms. All Rb(2)-C(1) bond lengths are 3.16 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded to three equivalent Rb(1) and three equivalent Rb(2) atoms to form a mixture of corner, edge, and face-sharing CRb6 octahedra. The corner-sharing octahedral tilt angles range from 34-40°. In the second C site, C(2) is bonded in a trigonal planar geometry to three equivalent Rb(1) atoms.