Hg2PCl2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to two equivalent P(1) atoms. In the second Hg site, Hg(2) is bonded in a distorted rectangular see-saw-like geometry to one P(1), one Cl(2), and two equivalent Cl(1) atoms. P(1) is bonded to one Hg(2), two equivalent Hg(1), and one P(1) atom to form corner-sharing PHg3P tetrahedra. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a water-like geometry to two equivalent Hg(2) atoms. In the second Cl site, Cl(2) is bonded in a single-bond geometry to one Hg(2) atom.
Hg2PCl2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to two equivalent P(1) atoms. Both Hg(1)-P(1) bond lengths are 2.48 Å. In the second Hg site, Hg(2) is bonded in a distorted rectangular see-saw-like geometry to one P(1), one Cl(2), and two equivalent Cl(1) atoms. The Hg(2)-P(1) bond length is 2.45 Å. The Hg(2)-Cl(2) bond length is 2.47 Å. Both Hg(2)-Cl(1) bond lengths are 2.81 Å. P(1) is bonded to one Hg(2), two equivalent Hg(1), and one P(1) atom to form corner-sharing PHg3P tetrahedra. The P(1)-P(1) bond length is 2.21 Å. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a water-like geometry to two equivalent Hg(2) atoms. In the second Cl site, Cl(2) is bonded in a single-bond geometry to one Hg(2) atom.