K5CuCO5 crystallizes in the orthorhombic Aem2 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 2-coordinate geometry to two equivalent O(1) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. In the third K site, K(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. In the fourth K site, K(4) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Cu(1) is bonded in a linear geometry to two equivalent O(1) atoms. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one K(3), two equivalent K(2), two equivalent K(4), and one C(1) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one K(3), one K(4), two equivalent K(2), and one C(1) atom. In the third O site, O(1) is bonded to one K(1), one K(3), one K(4), two equivalent K(2), and one Cu(1) atom to form distorted corner-sharing OK5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-24°.
K5CuCO5 crystallizes in the orthorhombic Aem2 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 2-coordinate geometry to two equivalent O(1) atoms. Both K(1)-O(1) bond lengths are 2.64 Å. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The K(2)-O(2) bond length is 3.18 Å. There is one shorter (2.72 Å) and one longer (2.74 Å) K(2)-O(1) bond length. There is one shorter (2.67 Å) and one longer (2.96 Å) K(2)-O(3) bond length. In the third K site, K(3) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(1), and two equivalent O(3) atoms. The K(3)-O(2) bond length is 2.60 Å. Both K(3)-O(1) bond lengths are 2.95 Å. Both K(3)-O(3) bond lengths are 2.84 Å. In the fourth K site, K(4) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both K(4)-O(1) bond lengths are 2.64 Å. Both K(4)-O(2) bond lengths are 3.07 Å. Both K(4)-O(3) bond lengths are 2.88 Å. Cu(1) is bonded in a linear geometry to two equivalent O(1) atoms. Both Cu(1)-O(1) bond lengths are 1.81 Å. C(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(3) atoms. The C(1)-O(2) bond length is 1.31 Å. Both C(1)-O(3) bond lengths are 1.31 Å. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one K(3), two equivalent K(2), two equivalent K(4), and one C(1) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one K(3), one K(4), two equivalent K(2), and one C(1) atom. In the third O site, O(1) is bonded to one K(1), one K(3), one K(4), two equivalent K(2), and one Cu(1) atom to form distorted corner-sharing OK5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-24°.