Materials Data on Hg3H4S2O11 by Materials Project
Hg3H2(SO5)2H2O crystallizes in the monoclinic C2/c space group. The structure is two-dimensional and consists of four water molecules and two Hg3H2(SO5)2 sheets oriented in the (0, 0, 1) direction. In each Hg3H2(SO5)2 sheet, there are two inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded to six O2- atoms to form HgO6 octahedra that share corners with four equivalent SO4 tetrahedra. There are a spread of Hg–O bond distances ranging from 2.22–2.52 Å. In the second Hg2+ site, Hg2+ is bonded in a 2-coordinate geometry to two O2- atoms. There are one shorter (2.12 Å) and one longer (2.14 Å) Hg–O bond lengths. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent HgO6 octahedra. The corner-sharing octahedra tilt angles range from 38–61°. There are a spread of S–O bond distances ranging from 1.48–1.57 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two Hg2+ and one H1+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to one Hg2+ and one S6+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one S6+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Hg2+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Hg2+ and one S6+ atom.