Materials Data on K2S2O5 by Materials Project
K2S2O5 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to seven O2- atoms to form distorted edge-sharing KO7 pentagonal bipyramids. There are a spread of K–O bond distances ranging from 2.74–3.00 Å. In the second K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.86–3.27 Å. There are two inequivalent S4+ sites. In the first S4+ site, S4+ is bonded in a water-like geometry to two equivalent O2- atoms. Both S–O bond lengths are 1.51 Å. In the second S4+ site, S4+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. All S–O bond lengths are 1.49 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four K1+ and one S4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one S4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three K1+ and one S4+ atom.