Materials Data on Ca2CrH2I2O11 by Materials Project
Ca2CrH2O11I2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted CaO7 pentagonal bipyramids that share corners with three equivalent CrO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.37–2.53 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.75 Å. Cr6+ is bonded to four O2- atoms to form CrO4 tetrahedra that share corners with three equivalent CaO7 pentagonal bipyramids. There are a spread of Cr–O bond distances ranging from 1.64–1.70 Å. There are two 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 single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ca2+ and one I5+ atom. The O–I bond length is 1.82 Å. In the second O2- site, O2- is bonded in a single-bond geometry to one Cr6+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and one I5+ atom. The O–I bond length is 1.83 Å. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to one Ca2+ and two H1+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and one Cr6+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two Ca2+ and one Cr6+ atom. In the seventh O2- site, O2- is bonded in a trigonal planar geometry to two Ca2+ and one I5+ atom. The O–I bond length is 1.84 Å. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one I5+ atom. The O–I bond length is 1.83 Å. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Ca2+ and one Cr6+ atom. In the tenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca2+ and one I5+ atom. The O–I bond length is 1.85 Å. In the eleventh O2- site, O2- is bonded in a bent 120 degrees geometry to one Ca2+ and one I5+ atom. The O–I bond length is 1.83 Å. There are two inequivalent I5+ sites. In the first I5+ site, I5+ is bonded in a 3-coordinate geometry to three O2- atoms. In the second I5+ site, I5+ is bonded in a 3-coordinate geometry to three O2- atoms.