Materials Data on SmH5(SeO4)2 by Materials Project
SmH3Se2O7H2O crystallizes in the orthorhombic P2_12_12_1 space group. The structure is two-dimensional and consists of four water molecules and two SmH3Se2O7 sheets oriented in the (0, 0, 1) direction. In each SmH3Se2O7 sheet, Sm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sm–O bond distances ranging from 2.35–2.53 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 1.00 Å. In the second H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.70 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 0.98 Å. There are two inequivalent Se4+ sites. In the first Se4+ site, Se4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.71–1.75 Å. In the second Se4+ site, Se4+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.69–1.83 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Sm3+ and one Se4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Sm3+, one H1+, and one Se4+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Sm3+ and one Se4+ atom. In the fourth O2- site, O2- is bonded in a water-like geometry to one H1+ and one Se4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sm3+ and one Se4+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Sm3+ and one Se4+ atom. In the seventh O2- site, O2- is bonded in a distorted water-like geometry to one Sm3+ and two H1+ atoms.