ANTIMONY TRIIODIDE

Submitted by John C. Bailar, Jr., and Paul F. Cundy Checked by W. C. Johnson f and S. Weinhouse  

Twenty grams of antimony powder is suspended in 1 1. of boiling benzene in a flask fitted with a reflux condenser. 

If mechanical stirring is provided, this method can be used for the preparation of much larger amounts of the material. 

Antimony triiodide forms beautiful ruby-red crystals which are soluble in carbon disulfide, benzene, alcohol, and acetone. The tendency to sublime becomes noticeable at temperatures as low as 100°C., but the melting point and boiling point are 166°C. and about 400°C., respectively. 

Antimony triiodide reacts rapidly with moisture to give an oxyiodide. The same compound is formed by long exposure to dry air, part of the iodine being displaced by oxygen. 

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ANTIMONY TRIIODIDE ANTIMONY TRIOXIDE SCANDIUM SELENIUM... 

Acetic acid-acetic anhydride, 85 Alkali azides, 79 Alkaline earth azides, 79 Alumino-oxalates, 36 Amalgams, 5 concentration of, 17 preparation of, 6 rare earth metal, 15 Ammonium nitrourethane, 69 Ammonium perrhenate, 177 Antimony oxyiodide, 105 Antimony triiodide, 104 Aquopentammino cobalti bromide, 187, 188... 

Antimony triiodide [7790-44-5] M 502.5, m 167", 170", b 401", It sublimes under vacuum as a red solid with an orange vapour. It hydrolyses to the yellow oxyiodide with H2O. [Schenk in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 614 7965.]... 

Parameter Antimony trifluoride Antimony trichloride Antimony tribromide Antimony triiodide a Antimony pentafluoride Antimony pentachloride... 

Both antimony tribromide and antimony triiodide are prepared by reaction of the elements. Their chemistry is similar to that of SbQ3 in that they readily hydrolyze, form complex halide ions, and form a wide variety of adducts with ethers, aldehydes, mercaptans, etc. They are soluble in carbon disulfide, acetone, and chloroform. There has been considerable interest in the compounds antimony bromide sulfide [14794-85-5], antimony iodide sulfide [13868-38-1], ISSb, and antimony iodide selenide [15513-79-8] with respect to their solid-state properties, ferroelectricity, pyroelectricity, photoconduction, and dielectric polarization. 

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