Materials Data on NiH2SO5 by Materials Project
NiH2SO5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with two equivalent NiO6 octahedra and corners with four equivalent SO4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. There are a spread of Ni–O bond distances ranging from 2.04–2.15 Å. H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.72 Å) H–O bond length. S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with four equivalent NiO6 octahedra. The corner-sharing octahedra tilt angles range from 43–49°. There is two shorter (1.48 Å) and two longer (1.50 Å) S–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ni2+ and one S6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ni2+, one H1+, and one S6+ atom. In the third O2- site, O2- is bonded in a distorted water-like geometry to two equivalent Ni2+ and two equivalent H1+ atoms.