RbCO2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(4), two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Rb(2), three equivalent Rb(1), and one C(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one C(1) atom.
RbCO2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(4), two equivalent O(2), two equivalent O(3), and three equivalent O(1) atoms. The Rb(1)-O(4) bond length is 2.82 Å. There is one shorter (2.97 Å) and one longer (3.11 Å) Rb(1)-O(2) bond length. There is one shorter (2.99 Å) and one longer (3.05 Å) Rb(1)-O(3) bond length. There are a spread of Rb(1)-O(1) bond distances ranging from 3.06-3.16 Å. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (2.95 Å) and one longer (2.99 Å) Rb(2)-O(1) bond length. There is one shorter (2.88 Å) and one longer (3.01 Å) Rb(2)-O(2) bond length. Both Rb(2)-O(3) bond lengths are 2.90 Å. There is one shorter (3.16 Å) and one longer (3.19 Å) Rb(2)-O(4) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(1)-O(3) bond length is 1.27 Å. The C(1)-O(4) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.26 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Rb(2), three equivalent Rb(1), and one C(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one C(1) atom.