K2HgH2OCl4 crystallizes in the orthorhombic Pbam space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to three equivalent Cl(2) and four equivalent Cl(3) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to two equivalent O(1), three equivalent Cl(1), and four equivalent Cl(3) atoms. Hg(1) is bonded in a rectangular see-saw-like geometry to two equivalent Cl(1) and two equivalent Cl(3) atoms. H(1) is bonded in a single-bond geometry to one O(1) atom. O(1) is bonded in a water-like geometry to two equivalent K(2) and two equivalent H(1) atoms. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to three equivalent K(2) and two equivalent Hg(1) atoms to form distorted ClK3Hg2 trigonal bipyramids that share corners with four equivalent Cl(1)K3Hg2 trigonal bipyramids, corners with four equivalent Cl(3)K4Hg trigonal bipyramids, edges with two equivalent Cl(1)K3Hg2 trigonal bipyramids, and edges with six equivalent Cl(3)K4Hg trigonal bipyramids. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to three equivalent K(1) atoms. In the third Cl site, Cl(3) is bonded to two equivalent K(1), two equivalent K(2), and one Hg(1) atom to form distorted ClK4Hg trigonal bipyramids that share corners with two equivalent Cl(1)K3Hg2 trigonal bipyramids, corners with five equivalent Cl(3)K4Hg trigonal bipyramids, edges with three equivalent Cl(1)K3Hg2 trigonal bipyramids, and edges with four equivalent Cl(3)K4Hg trigonal bipyramids.
K2HgH2OCl4 crystallizes in the orthorhombic Pbam space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to three equivalent Cl(2) and four equivalent Cl(3) atoms. There are a spread of K(1)-Cl(2) bond distances ranging from 3.19-3.35 Å. There are two shorter (3.23 Å) and two longer (3.24 Å) K(1)-Cl(3) bond lengths. In the second K site, K(2) is bonded in a 9-coordinate geometry to two equivalent O(1), three equivalent Cl(1), and four equivalent Cl(3) atoms. Both K(2)-O(1) bond lengths are 2.88 Å. There are a spread of K(2)-Cl(1) bond distances ranging from 3.32-3.37 Å. There are two shorter (3.41 Å) and two longer (3.48 Å) K(2)-Cl(3) bond lengths. Hg(1) is bonded in a rectangular see-saw-like geometry to two equivalent Cl(1) and two equivalent Cl(3) atoms. Both Hg(1)-Cl(1) bond lengths are 2.81 Å. Both Hg(1)-Cl(3) bond lengths are 2.44 Å. H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.99 Å. O(1) is bonded in a water-like geometry to two equivalent K(2) and two equivalent H(1) atoms. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to three equivalent K(2) and two equivalent Hg(1) atoms to form distorted ClK3Hg2 trigonal bipyramids that share corners with four equivalent Cl(1)K3Hg2 trigonal bipyramids, corners with four equivalent Cl(3)K4Hg trigonal bipyramids, edges with two equivalent Cl(1)K3Hg2 trigonal bipyramids, and edges with six equivalent Cl(3)K4Hg trigonal bipyramids. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to three equivalent K(1) atoms. In the third Cl site, Cl(3) is bonded to two equivalent K(1), two equivalent K(2), and one Hg(1) atom to form distorted ClK4Hg trigonal bipyramids that share corners with two equivalent Cl(1)K3Hg2 trigonal bipyramids, corners with five equivalent Cl(3)K4Hg trigonal bipyramids, edges with three equivalent Cl(1)K3Hg2 trigonal bipyramids, and edges with four equivalent Cl(3)K4Hg trigonal bipyramids.