Materials Data on HgNCl by Materials Project
HgNCl crystallizes in the orthorhombic Pmmn space group. The structure is three-dimensional. Hg2+ is bonded to two equivalent N1- and four equivalent Cl1- atoms to form a mixture of distorted face, edge, and corner-sharing HgN2Cl4 octahedra. The corner-sharing octahedral tilt angles are 21°. Both Hg–N bond lengths are 3.02 Å. There are two shorter (2.85 Å) and two longer (2.93 Å) Hg–Cl bond lengths. N1- is bonded in a 3-coordinate geometry to two equivalent Hg2+ and one N1- atom. The N–N bond length is 1.12 Å. Cl1- is bonded in a distorted square co-planar geometry to four equivalent Hg2+ atoms.