Room‐temperature crystal structures of [CH(NH 2 ) 2 ] 3 Sb 2 X 9 ( X = Br and I)

Journal article

Crystals of formamidinium antimony, halides, FA3Sb2X9 {FA = [CH(NH2)2]+; X = Br− and I−} {or triformamidinium nonahalidodiantimony, (CH5N2)3[Sb2X9]}, have been synthesized using a counter diffusion crystal growth (CDCG) method in silica gel and their structures determined from single‐crystal X‐ray diffraction data. FA3Sb2Br9 belongs to the trigonal space group P3m1, which is known as the Cs3Bi2Br9 structure type, and FA3Sb2I9 belongs to the hexagonal space group P63/mmc, called the Cs3Cr2Cl9 structure type. The change of the anion type from bromide to iodide results in the change of the structure type and the connectivity of the Sb—X octahedra. These structures are described and compared to the crystal types known for vacancy‐ordered triple‐perovskites.

Authors: Bhatt, P; Liu, Y; Regoutz, A; Palgrave, RG

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: International Union of Crystallography
• Journal: Acta Crystallographica Section C: Structural Chemistry
• Volume: 82
• Issue: 3
• Pages: 138-143
• Publication date: 2026-03-03
• Acceptance date: 2026-01-26
• DOI: 10.1107/s2053229626000811
• EISSN: 2053-2296
• ISSN: 2053-2296
• Language: English
• Keywords: single crystal; crystallography; counter diffusion crystal growth; antimony; formamidinium; halide perovskite; CDCG; crystal structure