(K2HgCl4)2H2 crystallizes in the orthorhombic Pbam space group. The structure consists of two 1333-74-0 atoms inside a K2HgCl4 framework. In the K2HgCl4 framework, K(1) is bonded in a 7-coordinate geometry to three equivalent Cl(1) and four equivalent Cl(2) atoms. Hg(1) is bonded to two equivalent Cl(2) and four equivalent Cl(1) atoms to form distorted edge-sharing HgCl6 octahedra. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to three equivalent K(1) and two equivalent Hg(1) atoms to form ClK3Hg2 trigonal bipyramids that share corners with four equivalent Cl(2)K4Hg trigonal bipyramids, corners with eight equivalent Cl(1)K3Hg2 trigonal bipyramids, edges with two equivalent Cl(1)K3Hg2 trigonal bipyramids, and edges with six equivalent Cl(2)K4Hg trigonal bipyramids. In the second Cl site, Cl(2) is bonded to four equivalent K(1) and one Hg(1) atom to form distorted ClK4Hg trigonal bipyramids that share corners with four equivalent Cl(1)K3Hg2 trigonal bipyramids, corners with five equivalent Cl(2)K4Hg trigonal bipyramids, edges with four equivalent Cl(2)K4Hg trigonal bipyramids, and edges with six equivalent Cl(1)K3Hg2 trigonal bipyramids.
(K2HgCl4)2H2 crystallizes in the orthorhombic Pbam space group. The structure consists of two 1333-74-0 atoms inside a K2HgCl4 framework. In the K2HgCl4 framework, K(1) is bonded in a 7-coordinate geometry to three equivalent Cl(1) and four equivalent Cl(2) atoms. There are a spread of K(1)-Cl(1) bond distances ranging from 3.20-3.29 Å. There are two shorter (3.20 Å) and two longer (3.23 Å) K(1)-Cl(2) bond lengths. Hg(1) is bonded to two equivalent Cl(2) and four equivalent Cl(1) atoms to form distorted edge-sharing HgCl6 octahedra. Both Hg(1)-Cl(2) bond lengths are 2.48 Å. All Hg(1)-Cl(1) bond lengths are 2.99 Å. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded to three equivalent K(1) and two equivalent Hg(1) atoms to form ClK3Hg2 trigonal bipyramids that share corners with four equivalent Cl(2)K4Hg trigonal bipyramids, corners with eight equivalent Cl(1)K3Hg2 trigonal bipyramids, edges with two equivalent Cl(1)K3Hg2 trigonal bipyramids, and edges with six equivalent Cl(2)K4Hg trigonal bipyramids. In the second Cl site, Cl(2) is bonded to four equivalent K(1) and one Hg(1) atom to form distorted ClK4Hg trigonal bipyramids that share corners with four equivalent Cl(1)K3Hg2 trigonal bipyramids, corners with five equivalent Cl(2)K4Hg trigonal bipyramids, edges with four equivalent Cl(2)K4Hg trigonal bipyramids, and edges with six equivalent Cl(1)K3Hg2 trigonal bipyramids.