Materials Data on NaH2(SO2)2 by Materials Project
NaH2SO4S crystallizes in the monoclinic C2 space group. The structure is two-dimensional and consists of four hydrogen sulfide molecules and two NaH2SO4 sheets oriented in the (1, 0, 0) direction. In each NaH2SO4 sheet, Na1+ is bonded to six O2- atoms to form distorted face-sharing NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.37–2.54 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. S+2.50+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. All S–O bond lengths are 1.47 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one S+2.50+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+ and one S+2.50+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Na1+ and one S+2.50+ atom. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Na1+ and two H1+ atoms.