DOE OSTI2020
MnH4(SO5)2 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one MnH4(SO5)2 sheet oriented in the (0, 1, 0) direction. Mn4+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with four SO4 tetrahedra. There are a spread of Mn–O bond distances ranging from 1.94–1.96 Å. There are four 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 1.00 Å. In the second H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.65 Å) H–O bond length. In the third H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.70 Å) H–O bond length. In the fourth H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.56 Å) H–O bond length. There are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 40–49°. There are a spread of S–O bond distances ranging from 1.45–1.53 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent MnO6 octahedra. The corner-sharing octahedra tilt angles range from 44–45°. There are a spread of S–O bond distances ranging from 1.46–1.53 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Mn4+ and one S6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Mn4+ and two H1+ atoms. 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 trigonal non-coplanar geometry to one Mn4+ and two H1+ atoms. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one H1+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mn4+ and one S6+ atom. In the seventh O2- site, O2- is bonded in a bent 120 degrees geometry to one Mn4+ and one S6+ atom. In the eighth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one H1+ and one S6+ atom. In the ninth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mn4+ and one S6+ atom. In the tenth O2- site, O2- is bonded in a water-like geometry to one H1+ and one S6+ atom.