K3(CuO2)2 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. In the second K site, K(2) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. In the second Cu site, Cu(2) is bonded in a distorted square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded in a 6-coordinate geometry to one K(2), three equivalent K(1), one Cu(1), and one Cu(2) atom.
K3(CuO2)2 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent O(1) atoms. There are a spread of K(1)-O(1) bond distances ranging from 2.69-2.87 Å. In the second K site, K(2) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. All K(2)-O(1) bond lengths are 2.62 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Cu(1)-O(1) bond lengths are 1.84 Å. In the second Cu site, Cu(2) is bonded in a distorted square co-planar geometry to four equivalent O(1) atoms. All Cu(2)-O(1) bond lengths are 1.94 Å. O(1) is bonded in a 6-coordinate geometry to one K(2), three equivalent K(1), one Cu(1), and one Cu(2) atom.