MgMn(CoO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), and two equivalent O(1) atoms. Mn(1) is bonded to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms to form MnO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form CoO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. In the second Co site, Co(2) is bonded to one O(2), one O(6), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Mn(1), and two equivalent Co(1) atoms to form distorted edge-sharing OMg2MnCo2 trigonal bipyramids. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mn(1) and one Co(2) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Co(1), and two equivalent Co(2) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Mn(1) and one Co(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(1), and two equivalent Co(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Co(2) and two equivalent Co(1) atoms.
MgMn(CoO3)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(3), one O(5), and two equivalent O(1) atoms. The Mg(1)-O(3) bond length is 2.01 Å. The Mg(1)-O(5) bond length is 1.91 Å. Both Mg(1)-O(1) bond lengths are 2.06 Å. Mn(1) is bonded to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms to form MnO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The Mn(1)-O(1) bond length is 1.99 Å. The Mn(1)-O(5) bond length is 1.92 Å. Both Mn(1)-O(2) bond lengths are 1.94 Å. There is one shorter (1.95 Å) and one longer (1.96 Å) Mn(1)-O(4) bond length. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form CoO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The Co(1)-O(3) bond length is 1.91 Å. The Co(1)-O(4) bond length is 1.91 Å. There is one shorter (2.07 Å) and one longer (2.08 Å) Co(1)-O(1) bond length. There is one shorter (1.89 Å) and one longer (1.90 Å) Co(1)-O(6) bond length. In the second Co site, Co(2) is bonded to one O(2), one O(6), two equivalent O(3), and two equivalent O(5) atoms to form CoO6 octahedra that share edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Co(1)O6 octahedra, and edges with two equivalent Co(2)O6 octahedra. The Co(2)-O(2) bond length is 1.94 Å. The Co(2)-O(6) bond length is 1.90 Å. There is one shorter (1.90 Å) and one longer (2.06 Å) Co(2)-O(3) bond length. There is one shorter (1.95 Å) and one longer (2.18 Å) Co(2)-O(5) bond length. There are six inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Mn(1), and two equivalent Co(1) atoms to form distorted edge-sharing OMg2MnCo2 trigonal bipyramids. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Mn(1) and one Co(2) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Co(1), and two equivalent Co(2) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to two equivalent Mn(1) and one Co(1) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mn(1), and two equivalent Co(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Co(2) and two equivalent Co(1) atoms.