Thallium(I) iodide
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| Thallium(I) iodide | |
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| General | |
| Other names | thallium monoiodide thallous iodide |
| Molecular formula | TlI |
| Molar mass | 331.2878 g/mol |
| Appearance | yellow crystals red crystals above 170 °C |
| CAS number | [7790-30-9] |
| Properties | |
| Density and phase | 7.29 g/cm3, solid |
| Solubility in water | insoluble |
| Melting point | 440°C |
| Boiling point | 823°C |
| Hazards | |
| EU classification | not listed |
| NFPA 704 | |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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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.
TlI 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−.
Thallium(I) iodide is, like all thallium compounds, highly toxic. Conditions/substances to avoid are: heat.
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