Materials Data on Ba(SO2)2 by Materials Project

Abstract

Ba(SO2)2 crystallizes in the orthorhombic Pbcn space group. The structure is two-dimensional and consists of two Ba(SO2)2 sheets oriented in the (0, 0, 1) direction. Ba2+ is bonded in a 5-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.59–3.37 Å. There are two inequivalent S3+ sites. In the first S3+ site, S3+ is bonded in a single-bond geometry to one O2- atom. The S–O bond length is 1.55 Å. In the second S3+ site, S3+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There is two shorter (1.49 Å) and one longer (1.50 Å) S–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ba2+ and one S3+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ba2+ and one S3+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and one S3+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Ba2+ and one S3+ atom.