K2HgCl4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms to form a mixture of edge, face, and corner-sharing KCl6 octahedra. The corner-sharing octahedral tilt angles range from 23-34°. In the second K site, K(2) is bonded to two equivalent Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms to form a mixture of distorted edge, face, and corner-sharing KCl6 octahedra. The corner-sharing octahedral tilt angles range from 23-34°. Hg(1) is bonded in a distorted T-shaped geometry to one Cl(3) and two equivalent Cl(1) atoms. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Hg(1) atom. In the second Cl site, Cl(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1) and two equivalent K(2) 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 corner-sharing ClK4Hg trigonal bipyramids.
K2HgCl4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to two equivalent Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms to form a mixture of edge, face, and corner-sharing KCl6 octahedra. The corner-sharing octahedral tilt angles range from 23-34°. Both K(1)-Cl(1) bond lengths are 3.24 Å. Both K(1)-Cl(2) bond lengths are 3.12 Å. Both K(1)-Cl(3) bond lengths are 3.23 Å. In the second K site, K(2) is bonded to two equivalent Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms to form a mixture of distorted edge, face, and corner-sharing KCl6 octahedra. The corner-sharing octahedral tilt angles range from 23-34°. Both K(2)-Cl(1) bond lengths are 3.48 Å. Both K(2)-Cl(2) bond lengths are 3.13 Å. Both K(2)-Cl(3) bond lengths are 3.18 Å. Hg(1) is bonded in a distorted T-shaped geometry to one Cl(3) and two equivalent Cl(1) atoms. The Hg(1)-Cl(3) bond length is 2.71 Å. Both Hg(1)-Cl(1) bond lengths are 2.36 Å. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Hg(1) atom. In the second Cl site, Cl(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1) and two equivalent K(2) 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 corner-sharing ClK4Hg trigonal bipyramids.