Rb3MnO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. Mn(1) is bonded in a distorted see-saw-like geometry to one O(1), one O(3), and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Mn(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), two equivalent Rb(1), and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Mn(1) atom.
Rb3MnO3 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Rb(1)-O(3) bond length is 2.79 Å. There is one shorter (2.92 Å) and one longer (3.13 Å) Rb(1)-O(1) bond length. There is one shorter (2.77 Å) and one longer (2.98 Å) Rb(1)-O(2) bond length. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Rb(2)-O(2) bond length is 3.01 Å. There is one shorter (2.74 Å) and one longer (2.92 Å) Rb(2)-O(1) bond length. There is one shorter (2.83 Å) and one longer (2.89 Å) Rb(2)-O(3) bond length. In the third Rb site, Rb(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The Rb(3)-O(2) bond length is 2.86 Å. There is one shorter (2.83 Å) and one longer (2.92 Å) Rb(3)-O(1) bond length. There is one shorter (2.91 Å) and one longer (2.94 Å) Rb(3)-O(3) bond length. Mn(1) is bonded in a distorted see-saw-like geometry to one O(1), one O(3), and two equivalent O(2) atoms. The Mn(1)-O(1) bond length is 1.85 Å. The Mn(1)-O(3) bond length is 1.85 Å. Both Mn(1)-O(2) bond lengths are 1.95 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Mn(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), two equivalent Rb(1), and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), and one Mn(1) atom.