Rb3CoO2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in an L-shaped geometry to one O(1) and one O(2) atom. In the second Rb site, Rb(2) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Co(1) is bonded in a linear geometry to one O(1) and one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(1), four equivalent Rb(2), and one Co(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), four equivalent Rb(2), and one Co(1) atom.
Rb3CoO2 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in an L-shaped geometry to one O(1) and one O(2) atom. The Rb(1)-O(1) bond length is 2.78 Å. The Rb(1)-O(2) bond length is 2.81 Å. In the second Rb site, Rb(2) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Rb(2)-O(1) bond lengths are 2.87 Å. There is one shorter (2.84 Å) and one longer (2.91 Å) Rb(2)-O(2) bond length. Co(1) is bonded in a linear geometry to one O(1) and one O(2) atom. The Co(1)-O(1) bond length is 1.75 Å. The Co(1)-O(2) bond length is 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(1), four equivalent Rb(2), and one Co(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), four equivalent Rb(2), and one Co(1) atom.