DOI: 10.17188/1742016
title: Materials Data on Zn2As(HO2)3 by Materials Project

description: Zn2As(HO2)3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are four inequivalent Zn2+ sites. In the first Zn2+ site, Zn2+ is bonded to six O2- atoms to form ZnO6 octahedra that share corners with four AsO4 tetrahedra, corners with two equivalent ZnO5 trigonal bipyramids, an edgeedge with one ZnO6 octahedra, and edges with two ZnO5 trigonal bipyramids. There are a spread of Zn–O bond distances ranging from 2.07–2.18 Å. In the second Zn2+ site, Zn2+ is bonded to five O2- atoms to form ZnO5 trigonal bipyramids that share corners with four AsO4 tetrahedra, a cornercorner with one ZnO5 trigonal bipyramid, an edgeedge with one ZnO6 octahedra, and an edgeedge with one ZnO5 trigonal bipyramid. There are a spread of Zn–O bond distances ranging from 2.00–2.14 Å. In the third Zn2+ site, Zn2+ is bonded to five O2- atoms to form ZnO5 trigonal bipyramids that share corners with two equivalent ZnO6 octahedra, corners with three AsO4 tetrahedra, a cornercorner with one ZnO5 trigonal bipyramid, and an edgeedge with one ZnO6 octahedra. The corner-sharing octahedra tilt angles range from 47–59°. There are a spread of Zn–O bond distances ranging from 2.00–2.36 Å. In the fourth Zn2+ site, Zn2+ is bonded to five O2- atoms to form ZnO5 trigonal bipyramids that share corners with three equivalent AsO4 tetrahedra and an edgeedge with one ZnO5 trigonal bipyramid. There are a spread of Zn–O bond distances ranging from 2.02–2.12 Å. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share a cornercorner with one ZnO6 octahedra and corners with six ZnO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 58°. There is one shorter (1.72 Å) and three longer (1.73 Å) As–O bond length. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with three equivalent ZnO6 octahedra and corners with four ZnO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 50–63°. There are a spread of As–O bond distances ranging from 1.71–1.74 Å. There are six 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 0.98 Å. In the second 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 third 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 fourth 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 fifth H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.70 Å) H–O bond length. In the sixth H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.60 Å) H–O bond length. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Zn2+ and one As5+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one As5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one As5+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Zn2+, one As5+, and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one As5+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Zn2+ and one As5+ atom. In the eighth O2- site, O2- is bonded in a bent 120 degrees geometry to one Zn2+ and one As5+ atom. In the ninth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Zn2+ and two H1+ atoms. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to three Zn2+ and one H1+ atom. In the eleventh O2- site, O2- is bonded in a distorted tetrahedral geometry to two Zn2+ and two H1+ atoms. In the twelfth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Zn2+ and two H1+ atoms.