KHC2O4 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(2), one O(4), two equivalent O(3), and three equivalent O(1) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. H(1) is bonded in a linear geometry to one O(2) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one K(1), one C(2), and one H(1) atom.
KHC2O4 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(2), one O(4), two equivalent O(3), and three equivalent O(1) atoms. The K(1)-O(2) bond length is 2.77 Å. The K(1)-O(4) bond length is 2.97 Å. There is one shorter (2.83 Å) and one longer (2.84 Å) K(1)-O(3) bond length. There are a spread of K(1)-O(1) bond distances ranging from 2.83-2.94 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(2)-O(3) bond length is 1.23 Å. The C(2)-O(4) bond length is 1.32 Å. H(1) is bonded in a linear geometry to one O(2) and one O(4) atom. The H(1)-O(2) bond length is 1.45 Å. The H(1)-O(4) bond length is 1.07 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one K(1), one C(2), and one H(1) atom.