Tellurium tetraiodide

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Tellurium tetraiodide
Te4I16.png
Names
Other names
tellurium(IV) iodide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.029.282
EC Number 232-210-5
Properties
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
orthorhombic
Hazards
not listed
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.[1] In TeI4 the Te atoms are octahedrally coordinated and edges of the octahedra are shared.[1]

TeI4 can be prepared from the elements or by reacting Te and iodomethane, CH3I.[1] In the vapour TeI4 dissociates:[2]

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:[2]

TeI4 + 2 CH3CN → (CH3CN)2TeI3+ + I

References[edit]

  1. ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  2. ^ a b Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5