Materials Data on K2SO3 by Materials Project
K2SO3 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of K–O bond distances ranging from 2.69–3.14 Å. In the second K1+ site, K1+ is bonded to five O2- atoms to form distorted edge-sharing KO5 square pyramids. There are a spread of K–O bond distances ranging from 2.68–3.02 Å. S4+ is bonded in a water-like geometry to two O2- atoms. There is one shorter (1.51 Å) and one longer (1.52 Å) S–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one S4+ atom. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to four K1+ atoms. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four K1+ and one S4+ atom.