Materials Data on Sr(H9O5)2 by Materials Project
(SrH17O9)2H2O2 crystallizes in the tetragonal P4/ncc space group. The structure is two-dimensional and consists of four water molecules and two SrH17O9 sheets oriented in the (0, 0, 1) direction. In each SrH17O9 sheet, Sr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.66 Å) and four longer (2.68 Å) Sr–O bond lengths. There are five 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 single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the third H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.65 Å) H–O bond length. In the fourth 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 fifth H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a water-like geometry to one Sr2+ and two H1+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to five H1+ atoms. In the third O2- site, O2- is bonded in a water-like geometry to one Sr2+ and two H1+ atoms.