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Thallium triiodide is a chemical compound of thallium and iodine with formula TlI3. Unlike the other thallium trihalides, which contain thallium, TlI3 is a thallium salt and contains the triiodide ion, I3.
An appreciation as to why Tl is not oxidised to Tl in the reaction:
can be gained by considering the standard reduction potentials of the half cells which are:
The favoured reaction is therefore the reduction of Tl to Tl.
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