Tellurium tetraiodide

Tellurium tetraiodide

Names
Other names tellurium(IV) iodide
Identifiers
CAS Number	7790-48-9
EC Number	232-210-5
Jmol 3D model	Interactive image
PubChem	82255
InChI InChI=1S/I4Te/c1-5(2,3)4
SMILES [Te](I)(I)(I)I
Properties
Chemical formula	TeI4
Molar mass	635.218 g/mol
Appearance	black crystals
Density	5.05 g/cm³, solid
Melting point	280 °C (536 °F; 553 K)
Structure
Crystal structure	orthorhombic
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Tellurium tetraiodide (TeI₄) is an inorganic chemical compound. It has a tetrameric structure which is different from the tetrameric solid forms of TeCl₄ and TeBr₄. 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, 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, CH₃CN ionic complexes are formed which make the solution conducting:

TeI₄ + 2 CH₃CN → (CH₃CN)₂TeI₃⁺ + I⁻