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Thallium(I) iodide
Thallium(I) iodide (TlI) is a chemical compound of formula TlI. It is unusual in being one of the few water-insoluble metal iodides, along with AgI, PbI2 and HgI2. Additional recommended knowledgeTlI can be formed in aqueous solution by metathesis of any soluble thallium salt with iodide ion. It is also formed as a by-product in thallium-promoted iodination of phenols with thallium(I) acetate. Attempts to oxidise TlI to thallium(III) iodide fail, since oxidation produces the thallium(I) triiodide, Tl+I3−. Yellow TlI has an orthorhombic structure which can be considered to be a distorted NaCl structure. The distorted structure is believed to be caused by favourable thallium-thallium interactions, the closest Tl-Tl distance is 383pm.[1] At 175oC it transforms to a red CsCl form. Under high pressure, 160kbar, it becomes a metallic conductor. Applications include:
Thallium(I) iodide is, like all thallium compounds, highly toxic. Conditions/substances to avoid are: heat.
See also
General references
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Thallium(I)_iodide". A list of authors is available in Wikipedia. |