Materials Data on SrI2O7 by Materials Project
SrO7I2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Sr is bonded in a 11-coordinate geometry to eleven O atoms. There are a spread of Sr–O bond distances ranging from 2.60–3.15 Å. There are four inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to two equivalent Sr and one I atom. The O–I bond length is 1.83 Å. In the second O site, O is bonded in a distorted single-bond geometry to two equivalent Sr and one I atom. The O–I bond length is 1.83 Å. In the third O site, O is bonded in a distorted bent 120 degrees geometry to one Sr and one I atom. The O–I bond length is 1.84 Å. In the fourth O site, O is bonded in a single-bond geometry to one Sr atom. I is bonded in a 3-coordinate geometry to three O atoms.