Co7O12 crystallizes in the monoclinic C2 space group. There are six inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 15°. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form a mixture of distorted corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 14-19°. In the third Co site, Co(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 19°. In the fourth Co site, Co(4) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the fifth Co site, Co(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the sixth Co site, Co(6) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Co(2), one Co(3), and one Co(5) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(6) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Co(2), one Co(3), and one Co(5) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(6) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Co(2), one Co(3), and one Co(5) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(6) atom.
Co7O12 crystallizes in the monoclinic C2 space group. There are six inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 15°. Both Co(1)-O(2) bond lengths are 2.01 Å. Both Co(1)-O(4) bond lengths are 1.87 Å. Both Co(1)-O(6) bond lengths are 2.04 Å. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form a mixture of distorted corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles range from 14-19°. The Co(2)-O(1) bond length is 1.99 Å. The Co(2)-O(2) bond length is 2.08 Å. The Co(2)-O(3) bond length is 1.91 Å. The Co(2)-O(4) bond length is 2.36 Å. The Co(2)-O(5) bond length is 1.90 Å. The Co(2)-O(6) bond length is 2.13 Å. In the third Co site, Co(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 19°. Both Co(3)-O(1) bond lengths are 1.90 Å. Both Co(3)-O(3) bond lengths are 1.85 Å. Both Co(3)-O(5) bond lengths are 1.91 Å. In the fourth Co site, Co(4) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Co(4)-O(2) bond lengths are 1.85 Å. Both Co(4)-O(4) bond lengths are 1.94 Å. Both Co(4)-O(6) bond lengths are 1.90 Å. In the fifth Co site, Co(5) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Co(5)-O(1) bond lengths are 1.85 Å. Both Co(5)-O(3) bond lengths are 1.88 Å. Both Co(5)-O(5) bond lengths are 1.91 Å. In the sixth Co site, Co(6) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form a mixture of corner and edge-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Co(6)-O(2) bond lengths are 2.09 Å. Both Co(6)-O(4) bond lengths are 1.90 Å. Both Co(6)-O(6) bond lengths are 1.92 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Co(2), one Co(3), and one Co(5) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(6) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Co(2), one Co(3), and one Co(5) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(6) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Co(2), one Co(3), and one Co(5) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Co(1), one Co(2), one Co(4), and one Co(6) atom.