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Antimony triiodide

Antimony triiodide
Molecular formula	SbI₃
Identifiers
CAS number	7790-44-5
Properties
Molar mass	502.473 g/mol
Appearance	Red crystals
Density	4.92 g/cm³, solid
Melting point	171 °C
Boiling point	401 °C
Magnetic susceptibility	-0.0001472 cm³/mol
Structure
Crystal structure	Rhombohedral
Hazards
EU classification	not listed
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Antimony triiodide is the chemical compound with the formula SbI₃. This ruby-red solid is the only characterized "binary" iodide of antimony, i.e. the sole compound isolated with the formula Sb_xI_y. Like many iodides of the heavier main group elements, its structure depends on the phase. Gaseous SbI₃ is a molecular, pyramidal species as anticipated by VSEPR theory. In the solid state, however, the Sb center is surrounded by an octahedron of six iodide ligands, three of which are closer and three more distant.^[1] For the related compound BiI₃, all six Bi---I distances are equal.^[2]

Additional recommended knowledge

References

^ Hsueh, H.C., Chen, R.K., Vass, H., Clark, S.J., Ackland, G.J., Poon, W.C.K., Crain, J. (1998). "Compression mechanisms in quasimolecular XI3 (X = As, Sb, Bi) solids". Physical Review B 58 (22): 14812-14822.
^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
^ D.-Y. Chung, T. Hogan, P. Brazis, M. Rocci-Lane, C. Kannewurf, M. Bastea, C. Uher, M. G. Kanatzidis "CsBi₄Te₆: A High-Performance Thermoelectric Material for Low-Temperature Applications" Science 2000, volume 287, pp 1024-27. doi:10.1126/science.287.5455.1024 10.1126/science.287.5455.1024