RbCO3 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 two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(6) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(2) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Rb(2) and one C(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2) and one C(2) atom. In the fifth 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 sixth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(2) atom.
RbCO3 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 two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There is one shorter (3.10 Å) and one longer (3.11 Å) Rb(1)-O(3) bond length. There is one shorter (2.95 Å) and one longer (3.14 Å) Rb(1)-O(4) bond length. There is one shorter (3.10 Å) and one longer (3.19 Å) Rb(1)-O(5) bond length. There is one shorter (2.94 Å) and one longer (3.05 Å) Rb(1)-O(6) bond length. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. The Rb(2)-O(1) bond length is 2.92 Å. The Rb(2)-O(2) bond length is 2.97 Å. There is one shorter (2.87 Å) and one longer (3.44 Å) Rb(2)-O(3) bond length. There is one shorter (3.12 Å) and one longer (3.24 Å) Rb(2)-O(4) bond length. There is one shorter (2.93 Å) and one longer (3.37 Å) Rb(2)-O(5) bond length. There is one shorter (3.12 Å) and one longer (3.54 Å) Rb(2)-O(6) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(6) atom. The C(1)-O(1) bond length is 1.41 Å. The C(1)-O(3) bond length is 1.26 Å. The C(1)-O(6) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(5) atom. The C(2)-O(2) bond length is 1.42 Å. The C(2)-O(4) bond length is 1.25 Å. The C(2)-O(5) bond length is 1.26 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(2) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Rb(2) and one C(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to one Rb(2) and one C(2) atom. In the fifth 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 sixth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Rb(2), and one C(2) atom.