- Thallium(I) chloride
Name = Thallium(I) chloride
ImageName = Thallium(I) chloride
OtherNames = thallium monochloride
Section1 = Chembox Identifiers
CASNo = 7791-12-0
Section2 = Chembox Properties
Formula = TlCl
MolarMass = 239.82 g/mol
Appearance = white, odorless crystalline
Density = 7.004 g/cm3, solid
Solubility = insoluble
MeltingPt = 430 °C
BoilingPt = 720 °C
Thallium(I) chloride is the
chemical compoundwith the formula TlCl. This colourless solid is an intermediate in the isolation of thallium from its ores. Typically, a sulfuric acid solution of thallium(I) is treated with HClto precipitate insoluble TlCl. This solid crystallizes in the caesium chloridemotif. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]
The low solubility of TlCl is exploited in chemical synthesis: treatment of metal chloride complexes with TlPF6, gives the corresponding metal
hexafluorophosphatederivative. 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 non-oxidizing.
A very rare mineral lafossaite, Tl(Cl,Br), is a natural form of thallium (I) chloride.
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