Tellurium tetraiodide

Tellurium tetraiodide
Names
	Other names tellurium(IV) iodide
Identifiers
CAS Number	7790-48-9 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.029.282
EC Number	232-210-5
PubChem CID	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
Hazards
EU classification (DSD) (outdated)	not listed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 (Te I₄) 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

1 2 3 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
1 2 Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5

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[Greenwood-1] 1 2 3 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.

[Wiberg-2] 1 2 Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5