Tellurium tetraiodide

Tellurium tetraiodide

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OtherNames = tellurium(IV) iodide
Section1 = Chembox Identifiers
CASNo = 7790-48-9
Section2 = Chembox Properties
Formula = TeI4
MolarMass = 635.22 g/mol
Appearance = black crystals
Density = 5.05 g/cm³, solid
MeltingPt = 280°C
BoilingPt =
Section3 = Chembox Structure
CrystalStruct = orthorhombic
Section7 = Chembox Hazards
EUClass = not listed

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.Greenwood&Earnshaw] 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"Inorganic Chemistry",Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0123526515] :

: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 + 2CH3CN → (CH3CN)2TeI3+ + I−

References


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