|Jmol-3D images||Image 1|
|Molar mass||239.82 g/mol|
|Appearance||white, odorless crystalline solid|
|Density||7.004 g/cm3 (20 °C)|
|Melting point||430 °C (806 °F; 703 K)|
|Boiling point||720 °C (1,328 °F; 993 K) (decomposes)|
|Solubility in water||0.29 g/100 mL (15.5 °C)
0.318 g/100 mL (20 °C)
2.41 g/100 mL (100 °C) 
|Solubility||insoluble in alcohol, acetone, NH4OH|
|Refractive index (nD)||2.247|
|EU classification||Very toxic (T+)
Dangerous for the environment (N)
|R-phrases||R26/28, R33, R51/53|
|S-phrases||(S1/2), S13, S28, S45, S61|
|LD50||24 mg/kg, oral, mouse|
|Other anions||Thallium(I) fluoride
|Other cations||Thallium(III) chloride
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Thallium(I) chloride is the chemical compound with the formula TlCl. This colourless solid is an intermediate in the isolation of thallium from its ores. Typically, an acidic solution of thallium(I) sulfate is treated with hydrochloric acid to precipitate insoluble thallium(I) chloride. This solid crystallizes in the caesium chloride motif.
The low solubility of TlCl is exploited in chemical synthesis: treatment of metal chloride complexes with TlPF6, gives the corresponding metal hexafluorophosphate derivative. The resulting TlCl precipitate is separated by filtration of the reaction mixture. The overall methodology is similar to the use of AgPF6, except that Tl+ is much less oxidizing.
The crystalline structure is of cubic CsCl type at room temperature, but it lowers to the orthorombic thallium iodide type upon cooling, the transition temperature being likely affected by the impurities.
A very rare mineral lafossaite, Tl(Cl,Br), is a natural form of thallium(I) chloride.
Thallium(I) chloride, like all thallium compounds, is highly toxic, although its low solubility limits its toxicity to a degree.
- Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
- Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- M Blackman et al "The Polymorphism of Thallium and Other Halides at Low Temperatures" Proc. Phys. Soc. 77 (1961) 471
- A-V Mudring "Thallium Halides – New Aspects of the Stereochemical Activity of Electron Lone Pairs of Heavier Main-Group Elements" Eur. J. Inorg. Chem. 6 (2007) 882
- R. P. Lowndes and C. H. Perry "Molecular structure and anharmonicity in thallium iodide" J. Chem. Phys. 58, 271 (1973)
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