Rb6Co2O7 crystallizes in the trigonal P-3 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one O(1) and three equivalent O(2) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3) and three equivalent O(2) atoms to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(3) and three equivalent O(1) atoms to form corner-sharing CoO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Rb(2), three equivalent Rb(1), and one Co(2) atom to form distorted ORb4Co trigonal bipyramids that share corners with two equivalent O(3)Rb3Co2 trigonal bipyramids, corners with two equivalent O(1)Rb4Co trigonal bipyramids,  an edgeedge with one O(3)Rb3Co2 trigonal bipyramid, and edges with three equivalent O(1)Rb4Co trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Rb(2), and one Co(1) atom. In the third O site, O(3) is bonded to three equivalent Rb(1), one Co(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing ORb3Co2 trigonal bipyramids.
Rb6Co2O7 crystallizes in the trigonal P-3 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), and three equivalent O(1) atoms. The Rb(1)-O(2) bond length is 2.78 Å. The Rb(1)-O(3) bond length is 2.90 Å. There are a spread of Rb(1)-O(1) bond distances ranging from 2.75-2.95 Å. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one O(1) and three equivalent O(2) atoms. The Rb(2)-O(1) bond length is 2.76 Å. There are a spread of Rb(2)-O(2) bond distances ranging from 2.80-2.94 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3) and three equivalent O(2) atoms to form corner-sharing CoO4 tetrahedra. The Co(1)-O(3) bond length is 1.89 Å. All Co(1)-O(2) bond lengths are 1.81 Å. In the second Co site, Co(2) is bonded to one O(3) and three equivalent O(1) atoms to form corner-sharing CoO4 tetrahedra. The Co(2)-O(3) bond length is 1.92 Å. All Co(2)-O(1) bond lengths are 1.80 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Rb(2), three equivalent Rb(1), and one Co(2) atom to form distorted ORb4Co trigonal bipyramids that share corners with two equivalent O(3)Rb3Co2 trigonal bipyramids, corners with two equivalent O(1)Rb4Co trigonal bipyramids,  an edgeedge with one O(3)Rb3Co2 trigonal bipyramid, and edges with three equivalent O(1)Rb4Co trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Rb(2), and one Co(1) atom. In the third O site, O(3) is bonded to three equivalent Rb(1), one Co(1), and one Co(2) atom to form a mixture of distorted corner and edge-sharing ORb3Co2 trigonal bipyramids.