DOI: 10.17188/1199888
title: Materials Data on CaB2H10O9 by Materials Project

description: CaB2H10O9 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ca2+ is bonded to seven O2- atoms to form distorted CaO7 pentagonal bipyramids that share corners with four BO4 tetrahedra, an edgeedge with one CaO7 pentagonal bipyramid, and an edgeedge with one BO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.36–2.56 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with two equivalent CaO7 pentagonal bipyramids, a cornercorner with one BO4 tetrahedra, and an edgeedge with one CaO7 pentagonal bipyramid. There are a spread of B–O bond distances ranging from 1.47–1.50 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share corners with two equivalent CaO7 pentagonal bipyramids and a cornercorner with one BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.51 Å. There are ten inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.65 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.01 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 one O2- atom. The H–O bond length is 0.99 Å. In the sixth 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 seventh 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 eighth 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 ninth 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 tenth H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.68 Å) H–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one B3+, and one H1+ atom. In the second O2- site, O2- is bonded in a water-like geometry to two H1+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one B3+, and one H1+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one B3+, and one H1+ atom. In the fifth O2- site, O2- is bonded in a water-like geometry to two equivalent Ca2+ and two H1+ atoms. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and two B3+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+, one B3+, and one H1+ atom. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to one B3+ and three H1+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one B3+ and one H1+ atom.