Materials Data on HgINO3 by Materials Project
HgNO3I crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two HgNO3I sheets oriented in the (0, 0, 1) direction. Hg2+ is bonded to four O2- and two equivalent I1- atoms to form distorted corner-sharing HgI2O4 pentagonal pyramids. There are two shorter (2.61 Å) and two longer (2.75 Å) Hg–O bond lengths. There are one shorter (2.73 Å) and one longer (2.75 Å) Hg–I bond lengths. N5+ is bonded in a trigonal planar geometry to three O2- atoms. All N–O bond lengths are 1.27 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Hg2+ and one N5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Hg2+ and one N5+ atom. I1- is bonded in a distorted L-shaped geometry to two equivalent Hg2+ atoms.