Hg4I7 crystallizes in the tetragonal P-4m2 space group. Hg(1) is bonded to one I(2), one I(3), and two equivalent I(1) atoms to form corner-sharing HgI4 tetrahedra. There are three inequivalent I sites. In the first I site, I(3) is bonded in a tetrahedral geometry to four equivalent Hg(1) atoms. In the second I site, I(1) is bonded in a water-like geometry to two equivalent Hg(1) atoms. In the third I site, I(2) is bonded in a water-like geometry to two equivalent Hg(1) atoms.
Hg4I7 crystallizes in the tetragonal P-4m2 space group. Hg(1) is bonded to one I(2), one I(3), and two equivalent I(1) atoms to form corner-sharing HgI4 tetrahedra. The Hg(1)-I(2) bond length is 2.88 Å. The Hg(1)-I(3) bond length is 3.14 Å. Both Hg(1)-I(1) bond lengths are 2.87 Å. There are three inequivalent I sites. In the first I site, I(3) is bonded in a tetrahedral geometry to four equivalent Hg(1) atoms. In the second I site, I(1) is bonded in a water-like geometry to two equivalent Hg(1) atoms. In the third I site, I(2) is bonded in a water-like geometry to two equivalent Hg(1) atoms.