Tellurium tetraiodide
Encyclopedia
Tellurium tetraiodide is an inorganic chemical compound
Chemical compound
A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together...

. It has a tetrameric structure which is different from the tetrameric solid forms of TeCl4
Tellurium tetrachloride
Tellurium tetrachloride is the inorganic compound with the empirical formula TeCl4. The compound is volatile, subliming at 200 °C at 0.1 mm Hg. Molten TeCl4 is ionic, dissociating into ions TeCl3+ and Te2Cl102−.-Structure:...

 and TeBr4
Tellurium tetrabromide
Tellurium tetrabromide is an inorganic chemical compound. It has a similar tetrameric structure to TeCl4. It can be made by reacting bromine and tellurium.. In the vapour TeBr4 dissociates :It is a conductor when molten, dissociating into the ions TeBr3+ and Br−Solutions in benzene and...

. In TeI4 the Te atoms are octahedrally coordinated and edges of the octahedra are shared.

TeI4 can be prepared from the elements or by reacting Te and iodomethane
Iodomethane
Methyl iodide, also called iodomethane, and commonly abbreviated "MeI", is the chemical compound with the formula CH3I. It is a dense, colorless, volatile liquid. In terms of chemical structure, it is related to methane by replacement of one hydrogen atom by an atom of iodine. It is naturally...

, CH3I.. In the vapour TeI4 dissociates :
TeI4 → TeI2 + I2


It is a conductor when molten, dissociating into the ions TeI3+ and I. In solvents with donor properties such as acetonitrile
Acetonitrile
Acetonitrile is the chemical compound with formula . This colourless liquid is the simplest organic nitrile. It is produced mainly as a byproduct of acrylonitrile manufacture...

, CH3CN ionic complexes are formed which make the solution conducting:
TeI4 + 2 CH3CN → (CH3CN)2TeI3+ + I
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