K(CoO2)2 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form edge-sharing CoO6 octahedra. In the second Co site, Co(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing CoO6 octahedra. In the third Co site, Co(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form edge-sharing CoO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one K(1), one Co(1), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing OKCo3 trigonal pyramids. In the second O site, O(2) is bonded to one K(2), one Co(1), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing OKCo3 trigonal pyramids. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(1), one K(2), one Co(2), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one K(1), one K(2), one Co(3), and two equivalent Co(1) atoms.
K(CoO2)2 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both K(1)-O(1) bond lengths are 2.60 Å. Both K(1)-O(3) bond lengths are 2.74 Å. Both K(1)-O(4) bond lengths are 2.74 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both K(2)-O(2) bond lengths are 2.61 Å. Both K(2)-O(3) bond lengths are 2.74 Å. Both K(2)-O(4) bond lengths are 2.74 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form edge-sharing CoO6 octahedra. The Co(1)-O(1) bond length is 1.89 Å. The Co(1)-O(2) bond length is 1.87 Å. There is one shorter (1.89 Å) and one longer (1.90 Å) Co(1)-O(3) bond length. There is one shorter (1.88 Å) and one longer (1.89 Å) Co(1)-O(4) bond length. In the second Co site, Co(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form edge-sharing CoO6 octahedra. Both Co(2)-O(1) bond lengths are 1.87 Å. Both Co(2)-O(2) bond lengths are 1.89 Å. Both Co(2)-O(3) bond lengths are 1.89 Å. In the third Co site, Co(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form edge-sharing CoO6 octahedra. Both Co(3)-O(1) bond lengths are 1.87 Å. Both Co(3)-O(2) bond lengths are 1.89 Å. Both Co(3)-O(4) bond lengths are 1.90 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to one K(1), one Co(1), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing OKCo3 trigonal pyramids. In the second O site, O(2) is bonded to one K(2), one Co(1), one Co(2), and one Co(3) atom to form a mixture of distorted edge and corner-sharing OKCo3 trigonal pyramids. In the third O site, O(3) is bonded in a 5-coordinate geometry to one K(1), one K(2), one Co(2), and two equivalent Co(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one K(1), one K(2), one Co(3), and two equivalent Co(1) atoms.