Materials Data on CdH6(SO4)4 by Materials Project
CdH6(S2O7)2O2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of four water molecules and one CdH6(S2O7)2 framework. In the CdH6(S2O7)2 framework, Cd2+ is bonded to six O2- atoms to form CdO6 octahedra that share corners with two equivalent SO4 tetrahedra. There are a spread of Cd–O bond distances ranging from 2.27–2.46 Å. There are three 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 linear geometry to two O2- atoms. There is one shorter (1.08 Å) and one longer (1.39 Å) H–O bond length. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. There are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are a spread of S–O bond distances ranging from 1.48–1.82 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share a cornercorner with one CdO6 octahedra. The corner-sharing octahedral tilt angles are 34°. There are a spread of S–O bond distances ranging from 1.43–1.59 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Cd2+ and one S6+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Cd2+ and one S6+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one H1+ and one S6+ atom. In the fifth O2- site, O2- is bonded in a water-like geometry to one H1+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two H1+ and one S6+ atom. In the seventh O2- site, O2- is bonded in a bent 150 degrees geometry to one Cd2+ and one S6+ atom.