Materials Data on NaVH2I2O9 by Materials Project
NaVH2O9I2 crystallizes in the monoclinic P2_1 space group. The structure is two-dimensional and consists of one NaVH2O9I2 sheet oriented in the (0, 0, 1) direction. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.38–2.52 Å. V5+ is bonded in a distorted trigonal bipyramidal geometry to five O2- atoms. There are a spread of V–O bond distances ranging from 1.66–2.04 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 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.00 Å) and one longer (1.78 Å) H–O bond length. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to one Na1+, one V5+, and one I5+ atom. The O–I bond length is 1.88 Å. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one V5+ and one I5+ atom. The O–I bond length is 1.90 Å. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one I5+ atom. The O–I bond length is 1.80 Å. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one I5+ atom. The O–I bond length is 1.81 Å. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one H1+, and one I5+ atom. The O–I bond length is 1.83 Å. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one V5+ and one I5+ atom. The O–I bond length is 1.92 Å. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Na1+ and one V5+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one Na1+ and one V5+ atom. In the ninth O2- site, O2- is bonded in a distorted water-like geometry to one Na1+ and two H1+ atoms. 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 6-coordinate geometry to three O2- atoms.