(KHgC2N2O)2Cl2 crystallizes in the orthorhombic Pnma space group. The structure consists of four hydrochloric acid atoms inside a KHgC2N2O framework. In the KHgC2N2O framework, K(1) is bonded in a 7-coordinate geometry to two equivalent N(1), three equivalent N(2), and two equivalent O(1) atoms. Hg(1) is bonded in a linear geometry to one C(1) and one C(2) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one Hg(1) and one N(1) atom. In the second C site, C(2) is bonded in a linear geometry to one Hg(1) and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(2) atom. O(1) is bonded in a distorted water-like geometry to two equivalent K(1) atoms.
(KHgC2N2O)2Cl2 crystallizes in the orthorhombic Pnma space group. The structure consists of four hydrochloric acid atoms inside a KHgC2N2O framework. In the KHgC2N2O framework, K(1) is bonded in a 7-coordinate geometry to two equivalent N(1), three equivalent N(2), and two equivalent O(1) atoms. Both K(1)-N(1) bond lengths are 2.99 Å. There is one shorter (2.98 Å) and two longer (3.06 Å) K(1)-N(2) bond lengths. Both K(1)-O(1) bond lengths are 2.90 Å. Hg(1) is bonded in a linear geometry to one C(1) and one C(2) atom. The Hg(1)-C(1) bond length is 2.04 Å. The Hg(1)-C(2) bond length is 2.05 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one Hg(1) and one N(1) atom. The C(1)-N(1) bond length is 1.17 Å. In the second C site, C(2) is bonded in a linear geometry to one Hg(1) and one N(2) atom. The C(2)-N(2) bond length is 1.17 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(1) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to three equivalent K(1) and one C(2) atom. O(1) is bonded in a distorted water-like geometry to two equivalent K(1) atoms.