Co9O13 crystallizes in the monoclinic C2/m space group. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(6) and four equivalent O(7) atoms to form a mixture of edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the second Co site, Co(2) is bonded to one O(4), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. In the third Co site, Co(3) is bonded to one O(5), two equivalent O(6), and three equivalent O(7) atoms to form a mixture of distorted edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the fourth Co site, Co(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. In the fifth Co site, Co(5) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(5), and two equivalent O(6) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Co(4) and four equivalent Co(2) atoms to form OCo6 octahedra that share corners with four equivalent O(3)Co5 square pyramids, edges with two equivalent O(1)Co6 octahedra, and edges with six equivalent O(3)Co5 square pyramids. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Co(4) and one Co(5) atom. In the third O site, O(3) is bonded to two equivalent Co(4) and three equivalent Co(2) atoms to form OCo5 square pyramids that share corners with two equivalent O(1)Co6 octahedra, edges with three equivalent O(1)Co6 octahedra, and edges with four equivalent O(3)Co5 square pyramids. The corner-sharing octahedral tilt angles are 10°. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Co(2) and two equivalent Co(4) atoms. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Co(3) and two equivalent Co(5) atoms. In the sixth O site, O(6) is bonded to one Co(1), two equivalent Co(3), and two equivalent Co(5) atoms to form a mixture of distorted edge and corner-sharing OCo5 trigonal bipyramids. In the seventh O site, O(7) is bonded to two equivalent Co(1) and three equivalent Co(3) atoms to form a mixture of distorted edge and corner-sharing OCo5 square pyramids.
Co9O13 crystallizes in the monoclinic C2/m space group. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(6) and four equivalent O(7) atoms to form a mixture of edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. Both Co(1)-O(6) bond lengths are 1.93 Å. All Co(1)-O(7) bond lengths are 2.08 Å. In the second Co site, Co(2) is bonded to one O(4), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. The Co(2)-O(4) bond length is 1.78 Å. Both Co(2)-O(1) bond lengths are 2.14 Å. There is one shorter (1.97 Å) and two longer (2.08 Å) Co(2)-O(3) bond lengths. In the third Co site, Co(3) is bonded to one O(5), two equivalent O(6), and three equivalent O(7) atoms to form a mixture of distorted edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 14°. The Co(3)-O(5) bond length is 1.79 Å. Both Co(3)-O(6) bond lengths are 2.11 Å. There is one shorter (2.03 Å) and two longer (2.19 Å) Co(3)-O(7) bond lengths. In the fourth Co site, Co(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. The Co(4)-O(1) bond length is 2.32 Å. The Co(4)-O(2) bond length is 1.81 Å. Both Co(4)-O(3) bond lengths are 2.21 Å. Both Co(4)-O(4) bond lengths are 1.98 Å. In the fifth Co site, Co(5) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(5), and two equivalent O(6) atoms. The Co(5)-O(2) bond length is 1.80 Å. Both Co(5)-O(5) bond lengths are 1.98 Å. Both Co(5)-O(6) bond lengths are 2.22 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Co(4) and four equivalent Co(2) atoms to form OCo6 octahedra that share corners with four equivalent O(3)Co5 square pyramids, edges with two equivalent O(1)Co6 octahedra, and edges with six equivalent O(3)Co5 square pyramids. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Co(4) and one Co(5) atom. In the third O site, O(3) is bonded to two equivalent Co(4) and three equivalent Co(2) atoms to form OCo5 square pyramids that share corners with two equivalent O(1)Co6 octahedra, edges with three equivalent O(1)Co6 octahedra, and edges with four equivalent O(3)Co5 square pyramids. The corner-sharing octahedral tilt angles are 10°. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Co(2) and two equivalent Co(4) atoms. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Co(3) and two equivalent Co(5) atoms. In the sixth O site, O(6) is bonded to one Co(1), two equivalent Co(3), and two equivalent Co(5) atoms to form a mixture of distorted edge and corner-sharing OCo5 trigonal bipyramids. In the seventh O site, O(7) is bonded to two equivalent Co(1) and three equivalent Co(3) atoms to form a mixture of distorted edge and corner-sharing OCo5 square pyramids.