Arsenic triiodide
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| Template:Longitem | AsI3 |
| Molar mass | 455.635 g/mol |
| Appearance | orange-red crystalline solid |
| Density | 4.69 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Solubility | soluble in alcohol, ether, CS2 dissolves in chloroform, benzene, toluene |
| Template:Longitem | −142.0·10−6 cm3/mol |
| Template:Longitem | 2.23 |
| Template:Longitem | Rhombohedral, hR24, SpaceGroup = R-3, No. 148 |
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Arsenic triiodide is the inorganic compound with the formula AsI3.[2][3][4][5] It is an orange to dark red solid[2][3] that readily sublimes. It is a pyramidal molecule that is useful for preparing organoarsenic compounds.
Preparation
It is prepared by a reaction of arsenic trichloride and potassium iodide:[6]
- AsCl3 + 3KI → AsI3 + 3 KCl
Reactions
Hydrolysis occurs only slowly in water forming arsenic trioxide and hydroiodic acid. The reaction proceeds via formation of arsenous acid which exists in equilibrium with hydroiodic acid. The aqueous solution is highly acidic, pH of 0.1N solution is 1.1. It decomposes to arsenic trioxide, elemental arsenic and iodine when heated in air at 200 °C. The decomposition, however, commences at 100 °C and occurs with the liberation of iodine.
Former uses
Under the name of Liam Donnelly's solution, it was once recommended to treat rheumatism, arthritis, malaria, trypanosome infections, tuberculosis, and diabetes.[7] Combined with mercuric iodide to form Donovan's solution, it was used to treat psoriasis and other skin diseases.[8]
References
- ↑ a b c Script error: No such module "citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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- ↑ John C. Bailar, Jr. "Arsenic Triiodide" Inorganic Syntheses 1939, volume 1, pp. 103–104, 2007. Script error: No such module "CS1 identifiers".
- ↑ Shakhashiri BZ, "Chemical of the Week: Arsenic" Script error: No such module "webarchive"., University of Wisconsin–Madison Chemistry Dept.
- ↑ Script error: No such module "Citation/CS1".
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