Materials Data on HI3O8 by Materials Project
HI3O8 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two I5+ atoms. There is one shorter (1.99 Å) and one longer (2.00 Å) O–I bond length. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one H1+ and one I5+ atom. The O–I bond length is 1.93 Å. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two I5+ atoms. There are one shorter (1.82 Å) and one longer (2.58 Å) O–I bond lengths. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three I5+ atoms. There are a spread of O–I bond distances ranging from 1.83–2.65 Å. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two I5+ atoms. There are one shorter (1.84 Å) and one longer (2.35 Å) O–I bond lengths. In the sixth O2- site, O2- is bonded in a single-bond geometry to one I5+ atom. The O–I bond length is 1.80 Å. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two I5+ atoms. There are one shorter (1.82 Å) and one longer (2.53 Å) O–I bond lengths. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to three I5+ atoms. There are a spread of O–I bond distances ranging from 1.82–2.81 Å. There are three inequivalent I5+ sites. In the first I5+ site, I5+ is bonded in a 6-coordinate geometry to six O2- atoms. In the second I5+ site, I5+ is bonded in a 5-coordinate geometry to five O2- atoms. In the third I5+ site, I5+ is bonded in a 5-coordinate geometry to five O2- atoms.