DOE OSTI2020
In4Br7 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are five inequivalent In+1.75+ sites. In the first In+1.75+ site, In+1.75+ is bonded in a 3-coordinate geometry to three equivalent Br1- atoms. All In–Br bond lengths are 3.26 Å. In the second In+1.75+ site, In+1.75+ is bonded in a tetrahedral geometry to four Br1- atoms. All In–Br bond lengths are 2.54 Å. In the third In+1.75+ site, In+1.75+ is bonded in a 4-coordinate geometry to four Br1- atoms. There are three shorter (3.25 Å) and one longer (3.42 Å) In–Br bond lengths. In the fourth In+1.75+ site, In+1.75+ is bonded in an octahedral geometry to six equivalent Br1- atoms. All In–Br bond lengths are 2.72 Å. In the fifth In+1.75+ site, In+1.75+ is bonded in a 6-coordinate geometry to six equivalent Br1- atoms. All In–Br bond lengths are 3.54 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a distorted linear geometry to two In+1.75+ atoms. In the second Br1- site, Br1- is bonded in a distorted T-shaped geometry to three In+1.75+ atoms. In the third Br1- site, Br1- is bonded in a single-bond geometry to two In+1.75+ atoms.