Materials Data on Bi2IBr by Materials Project
(Bi)2(BiI)2BiBr2BiIBr crystallizes in the monoclinic C2/m space group. The structure is one-dimensional and consists of eight bismuth molecules; four BiBr2 ribbons oriented in the (0, 1, 0) direction; four BiI ribbons oriented in the (0, 1, 0) direction; and four BiIBr ribbons oriented in the (0, 1, 0) direction. In each BiBr2 ribbon, Bi1+ is bonded in a square co-planar geometry to four Br1- atoms. There are two shorter (2.95 Å) and two longer (2.96 Å) Bi–Br bond lengths. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in an L-shaped geometry to two equivalent Bi1+ atoms. In the second Br1- site, Br1- is bonded in an L-shaped geometry to two equivalent Bi1+ atoms. In each BiI ribbon, there are two inequivalent Bi1+ sites. In the first Bi1+ site, Bi1+ is bonded in a square co-planar geometry to four I1- atoms. There are two shorter (3.13 Å) and two longer (3.14 Å) Bi–I bond lengths. In the second Bi1+ site, Bi1+ is bonded in a single-bond geometry to one I1- atom. The Bi–I bond length is 3.84 Å. There are two inequivalent I1- sites. In the first I1- site, I1- is bonded in an L-shaped geometry to three Bi1+ atoms. In the second I1- site, I1- is bonded in an L-shaped geometry to two equivalent Bi1+ atoms. In each BiIBr ribbon, Bi1+ is bonded in a rectangular see-saw-like geometry to two equivalent I1- and two equivalent Br1- atoms. Both Bi–I bond lengths are 3.12 Å. Both Bi–Br bond lengths are 2.97 Å. I1- is bonded in an L-shaped geometry to two equivalent Bi1+ atoms. Br1- is bonded in an L-shaped geometry to two equivalent Bi1+ atoms.