Materials Data on K(SbSe2)2 by Materials Project
K(SbSe2)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight Se+1.75- atoms. There are a spread of K–Se bond distances ranging from 3.41–3.88 Å. There are two inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded in a distorted see-saw-like geometry to four Se+1.75- atoms. There are a spread of Sb–Se bond distances ranging from 2.62–3.21 Å. In the second Sb3+ site, Sb3+ is bonded to five Se+1.75- atoms to form distorted edge-sharing SbSe5 square pyramids. There are a spread of Sb–Se bond distances ranging from 2.59–3.40 Å. There are four inequivalent Se+1.75- sites. In the first Se+1.75- site, Se+1.75- is bonded in a 4-coordinate geometry to one K1+ and three Sb3+ atoms. In the second Se+1.75- site, Se+1.75- is bonded in a 5-coordinate geometry to two equivalent K1+ and three Sb3+ atoms. In the third Se+1.75- site, Se+1.75- is bonded in a 1-coordinate geometry to two equivalent K1+, one Sb3+, and one Se+1.75- atom. The Se–Se bond length is 2.43 Å. In the fourth Se+1.75- site, Se+1.75- is bonded in a 5-coordinate geometry to three equivalent K1+ and two Sb3+ atoms.