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(TW)
Source
TFDA
7791-12-0Y
Interactive image
CHEBI:37117Y
23044Y
DB09316
232-241-4
24642
37CB58V15BY
DTXSID6024333
InChI=1S/ClH.Tl/h1H;/q;+1/p-1YKey: GBECUEIQVRDUKB-UHFFFAOYSA-MYInChI=1/ClH.Tl/h1H;/q;+1/p-1Key: GBECUEIQVRDUKB-REWHXWOFAE
Cl[Tl]
Thallium(I) chloride, also known asthallous chloride, is achemical compoundwith the formula TlCl. This colourless salt is an intermediate in the isolation ofthalliumfrom its ores. Typically, an acidic solution ofthallium(I) sulfateis treated withhydrochloric acidto precipitate insoluble thallium(I)chloride. This solid crystallizes in thecaesium chloridemotif.
The low solubility of TlCl is exploited in chemical synthesis: treatment of metal chloridecomplexeswith TlPF6, gives the corresponding metalhexafluorophosphatederivative. 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 caesium chloride type at room temperature, but it lowers to theorthorhombicthallium iodidetype upon cooling, the transition temperature being likely affected by the impurities.Nanometer-thin TlCl films grown on KBr substrates exhibit arocksaltstructure, while the films deposited onmicaor NaCl are of the regular CsCl type.
A very rare minerallafossaite,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.