Materials Data on S2I2O11 by Materials Project
S2O11I2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of four S2O11I2 ribbons oriented in the (0, 0, 1) direction. there are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form corner-sharing SO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.44–1.67 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form corner-sharing SO4 tetrahedra. There are a spread of S–O bond distances ranging from 1.44–1.65 Å. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one S6+ and one I5+ atom. The O–I bond length is 2.27 Å. In the second O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one S6+ and one I5+ atom. The O–I bond length is 2.28 Å. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to two S6+ atoms. In the fifth O2- site, O2- is bonded in a single-bond geometry to one I5+ atom. The O–I bond length is 1.76 Å. In the sixth O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. In the seventh O2- site, O2- is bonded in a water-like geometry to two I5+ atoms. There is one shorter (1.94 Å) and one longer (2.05 Å) O–I bond length. In the eighth O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one I5+ atom. The O–I bond length is 1.77 Å. In the tenth O2- site, O2- is bonded in a water-like geometry to two I5+ atoms. There are one shorter (1.94 Å) and one longer (2.06 Å) O–I bond lengths. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. There are two inequivalent I5+ sites. In the first I5+ site, I5+ is bonded in a 7-coordinate geometry to four O2- atoms. In the second I5+ site, I5+ is bonded in a 4-coordinate geometry to four O2- atoms.