Materials Data on UAsH9O10 by Materials Project

Abstract

UAsH7O9H2O crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of four water molecules and two UAsH7O9 sheets oriented in the (0, 0, 1) direction. In each UAsH7O9 sheet, U6+ is bonded to six O2- atoms to form UO6 octahedra that share corners with four equivalent AsO4 tetrahedra. There are a spread of U–O bond distances ranging from 1.81–2.34 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent UO6 octahedra. The corner-sharing octahedra tilt angles range from 43–48°. All As–O bond lengths are 1.72 Å. There are seven 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 (1.09 Å) and one longer (1.35 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 1.00 Å. In the fourth H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.03 Å) and one longer (1.56 Å) H–O bond length. In the fifth H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.72 Å) H–O bond length. In the seventh 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 nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one As5+ atom. In the second O2- site, O2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. In the third O2- site, O2- is bonded in a single-bond geometry to one U6+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to three H1+ atoms. In the fifth O2- site, O2- is bonded in a single-bond geometry to one U6+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three H1+ atoms. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one As5+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to one U6+, one As5+, and one H1+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one U6+ and one As5+ atom.