RbSm(CO3)2 crystallizes in the monoclinic C2/c space group. Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sm(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one Sm(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Sm(1), and one C(1) atom.
RbSm(CO3)2 crystallizes in the monoclinic C2/c space group. Rb(1) is bonded in a 6-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Both Rb(1)-O(3) bond lengths are 3.02 Å. There are two shorter (2.92 Å) and two longer (2.95 Å) Rb(1)-O(2) bond lengths. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both Sm(1)-O(1) bond lengths are 2.36 Å. Both Sm(1)-O(2) bond lengths are 2.45 Å. There are two shorter (2.42 Å) and two longer (2.57 Å) Sm(1)-O(3) bond lengths. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.30 Å. The C(1)-O(3) bond length is 1.32 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sm(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one Sm(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Sm(1), and one C(1) atom.