RbMnO2 crystallizes in the triclinic P-1 space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), and two equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted edge-sharing MnO5 square pyramids. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(6), and two equivalent O(4) atoms to form distorted edge-sharing MnO5 trigonal bipyramids. In the third Mn site, Mn(3) is bonded to one O(2), one O(3), one O(6), and two equivalent O(5) atoms to form edge-sharing MnO5 square pyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(3), two equivalent Rb(1), one Mn(1), and one Mn(3) atom. In the fourth O site, O(4) is bonded to one Rb(2), one Rb(3), one Mn(1), and two equivalent Mn(2) atoms to form distorted edge-sharing ORb2Mn3 trigonal bipyramids. In the fifth O site, O(5) is bonded to one Rb(1), one Rb(3), one Mn(1), and two equivalent Mn(3) atoms to form distorted edge-sharing ORb2Mn3 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Mn(1), one Mn(2), and one Mn(3) atom.
RbMnO2 crystallizes in the triclinic P-1 space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), and two equivalent O(3) atoms. The Rb(1)-O(1) bond length is 2.90 Å. The Rb(1)-O(2) bond length is 2.95 Å. The Rb(1)-O(5) bond length is 2.94 Å. The Rb(1)-O(6) bond length is 3.33 Å. There is one shorter (2.76 Å) and one longer (2.83 Å) Rb(1)-O(3) bond length. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms. The Rb(2)-O(4) bond length is 2.83 Å. The Rb(2)-O(6) bond length is 3.07 Å. There is one shorter (2.78 Å) and one longer (3.31 Å) Rb(2)-O(1) bond length. There is one shorter (2.84 Å) and one longer (3.11 Å) Rb(2)-O(2) bond length. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Rb(3)-O(1) bond length is 3.02 Å. The Rb(3)-O(2) bond length is 2.83 Å. The Rb(3)-O(3) bond length is 2.85 Å. The Rb(3)-O(4) bond length is 2.78 Å. The Rb(3)-O(5) bond length is 2.80 Å. The Rb(3)-O(6) bond length is 2.79 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form distorted edge-sharing MnO5 square pyramids. The Mn(1)-O(1) bond length is 1.91 Å. The Mn(1)-O(3) bond length is 1.90 Å. The Mn(1)-O(4) bond length is 1.92 Å. The Mn(1)-O(5) bond length is 1.92 Å. The Mn(1)-O(6) bond length is 2.31 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(6), and two equivalent O(4) atoms to form distorted edge-sharing MnO5 trigonal bipyramids. The Mn(2)-O(1) bond length is 1.90 Å. The Mn(2)-O(2) bond length is 1.91 Å. The Mn(2)-O(6) bond length is 1.92 Å. There is one shorter (1.94 Å) and one longer (2.20 Å) Mn(2)-O(4) bond length. In the third Mn site, Mn(3) is bonded to one O(2), one O(3), one O(6), and two equivalent O(5) atoms to form edge-sharing MnO5 square pyramids. The Mn(3)-O(2) bond length is 1.92 Å. The Mn(3)-O(3) bond length is 1.89 Å. The Mn(3)-O(6) bond length is 1.92 Å. There is one shorter (1.94 Å) and one longer (2.24 Å) Mn(3)-O(5) bond length. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Rb(3), two equivalent Rb(1), one Mn(1), and one Mn(3) atom. In the fourth O site, O(4) is bonded to one Rb(2), one Rb(3), one Mn(1), and two equivalent Mn(2) atoms to form distorted edge-sharing ORb2Mn3 trigonal bipyramids. In the fifth O site, O(5) is bonded to one Rb(1), one Rb(3), one Mn(1), and two equivalent Mn(3) atoms to form distorted edge-sharing ORb2Mn3 trigonal bipyramids. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Mn(1), one Mn(2), and one Mn(3) atom.