Materials Data on CdH2(SO4)2 by Materials Project
CdH2(SO4)2 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of two CdH2(SO4)2 sheets oriented in the (0, 1, 0) direction. Cd2+ is bonded to six O2- atoms to form CdO6 octahedra that share corners with six SO4 tetrahedra. There are a spread of Cd–O bond distances ranging from 2.27–2.36 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 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. 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 three equivalent CdO6 octahedra. The corner-sharing octahedra tilt angles range from 40–57°. There are a spread of S–O bond distances ranging from 1.47–1.58 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with three equivalent CdO6 octahedra. The corner-sharing octahedra tilt angles range from 29–56°. There are a spread of S–O bond distances ranging from 1.45–1.58 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cd2+ and one S6+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Cd2+ and one S6+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Cd2+ and one S6+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Cd2+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cd2+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a water-like geometry to one H1+ and one S6+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cd2+ 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.