K4CO4 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a distorted trigonal non-coplanar geometry to one O(3) and two equivalent O(1) atoms. In the second K site, K(2) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(1) atoms. In the third K site, K(3) is bonded in a 4-coordinate geometry to one C(1), one O(1), and two equivalent O(4) atoms. In the fourth K site, K(4) is bonded in a distorted rectangular see-saw-like geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. C(1) is bonded in a distorted single-bond geometry to one K(3) and one O(2) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one K(3), one K(4), two equivalent K(1), and two equivalent K(2) atoms. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one K(1), one K(2), and two equivalent K(4) atoms. In the fourth O site, O(4) is bonded to one K(2), two equivalent K(3), and two equivalent K(4) atoms to form distorted edge-sharing OK5 trigonal bipyramids.
K4CO4 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a distorted trigonal non-coplanar geometry to one O(3) and two equivalent O(1) atoms. The K(1)-O(3) bond length is 2.55 Å. There is one shorter (2.62 Å) and one longer (2.71 Å) K(1)-O(1) bond length. In the second K site, K(2) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), and two equivalent O(1) atoms. The K(2)-O(3) bond length is 2.65 Å. The K(2)-O(4) bond length is 3.03 Å. Both K(2)-O(1) bond lengths are 2.83 Å. In the third K site, K(3) is bonded in a 4-coordinate geometry to one C(1), one O(1), and two equivalent O(4) atoms. The K(3)-C(1) bond length is 2.96 Å. The K(3)-O(1) bond length is 2.63 Å. There is one shorter (2.60 Å) and one longer (2.63 Å) K(3)-O(4) bond length. In the fourth K site, K(4) is bonded in a distorted rectangular see-saw-like geometry to one O(1), two equivalent O(3), and two equivalent O(4) atoms. The K(4)-O(1) bond length is 3.32 Å. There is one shorter (2.62 Å) and one longer (2.70 Å) K(4)-O(3) bond length. There is one shorter (2.73 Å) and one longer (2.80 Å) K(4)-O(4) bond length. C(1) is bonded in a distorted single-bond geometry to one K(3) and one O(2) atom. The C(1)-O(2) bond length is 1.15 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one K(3), one K(4), two equivalent K(1), and two equivalent K(2) atoms. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one K(1), one K(2), and two equivalent K(4) atoms. In the fourth O site, O(4) is bonded to one K(2), two equivalent K(3), and two equivalent K(4) atoms to form distorted edge-sharing OK5 trigonal bipyramids.