Antimony triiodide

Antimony triiodide

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Formula = SbI3
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MolarMass = 502.473 g/mol
Appearance = Red crystals
Density = 4.92 g/cm3, solid
MeltingPt = 171 °C
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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 SbxIy. 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. [cite journal
title = Compression mechanisms in quasimolecular XI3 (X = As, Sb, Bi) solids
author = Hsueh, H.C., Chen, R.K., Vass, H., Clark, S.J., Ackland, G.J., Poon, W.C.K., Crain, J.
journal = Physical Review B
volume = 58
issue = 22
pages = 14812–14822
year = 1998
doi = 10.1103/PhysRevB.58.14812] For the related compound BiI3, all six Bi---I distances are equal. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]

SbI3 has been used as a dopant in the preparation of thermoelectric materials. [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]

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