K6Co2O7 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent K sites. In the first K site, K(1) 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 second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Co(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing CoO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to two equivalent K(1), two equivalent K(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), two equivalent K(2), two equivalent K(3), and one Co(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(3), and one Co(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(3), and one Co(1) atom.
K6Co2O7 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent K sites. In the first K site, K(1) 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 K(1)-O(1) bond length is 2.78 Å. The K(1)-O(2) bond length is 2.74 Å. There is one shorter (2.70 Å) and one longer (3.02 Å) K(1)-O(3) bond length. There is one shorter (2.75 Å) and one longer (2.90 Å) K(1)-O(4) bond length. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(2) atoms. The K(2)-O(1) bond length is 2.84 Å. The K(2)-O(3) bond length is 2.72 Å. The K(2)-O(4) bond length is 2.87 Å. There is one shorter (2.76 Å) and one longer (2.99 Å) K(2)-O(2) bond length. In the third K site, K(3) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (2.94 Å) and one longer (3.26 Å) K(3)-O(2) bond length. There is one shorter (2.61 Å) and one longer (2.63 Å) K(3)-O(3) bond length. There is one shorter (2.64 Å) and one longer (2.65 Å) K(3)-O(4) bond length. Co(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing CoO4 tetrahedra. The Co(1)-O(1) bond length is 1.86 Å. The Co(1)-O(2) bond length is 1.79 Å. The Co(1)-O(3) bond length is 1.78 Å. The Co(1)-O(4) bond length is 1.78 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted octahedral geometry to two equivalent K(1), two equivalent K(2), and two equivalent Co(1) atoms. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), two equivalent K(2), two equivalent K(3), and one Co(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(3), and one Co(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(2), two equivalent K(1), two equivalent K(3), and one Co(1) atom.