Materials Data on CsSn2Br5 by Materials Project
CsSn2Br5 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Cs1+ is bonded in a 10-coordinate geometry to ten Br1- atoms. There are eight shorter (3.82 Å) and two longer (4.03 Å) Cs–Br bond lengths. Sn2+ is bonded in a distorted rectangular see-saw-like geometry to four Br1- atoms. There are two shorter (2.76 Å) and two longer (3.15 Å) Sn–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded to two equivalent Cs1+ and four equivalent Sn2+ atoms to form distorted corner-sharing BrCs2Sn4 octahedra. The corner-sharing octahedra tilt angles range from 0–29°. In the second Br1- site, Br1- is bonded in a 3-coordinate geometry to two equivalent Cs1+ and one Sn2+ atom.
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