Tellurium tetraiodide

Tellurium tetraiodide
Names
	Other names tellurium(IV) iodide
Identifiers
CAS Number	7790-48-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	74232;
ECHA InfoCard	100.029.282
EC Number	232-210-5;
PubChem CID	82255;
UNII	ZB48I033V5 ;
CompTox Dashboard (EPA)	DTXSID1064877 ;
	InChI InChI=1S/I4Te/c1-5(2,3)4 Key: XCOKHDCPVWVFKS-UHFFFAOYSA-N;
	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
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H312, H314, H332
Precautionary statements	P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P322, P330, P363, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	(what is ?)
	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.^[2] In TeI₄ the Te atoms are octahedrally coordinated and edges of the octahedra are shared.^[2]

TeI₄ can be prepared from the elements or by reacting Te and iodomethane, CH₃I.^[2] In the vapour TeI₄ dissociates:^[3]

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:^[3]

TeI₄ + 2 CH₃CN → (CH₃CN)₂TeI₃⁺ + I⁻

References[]

^ "Tellurium tetraiodide". pubchem.ncbi.nlm.nih.gov. Retrieved 13 December 2021.
^ ^a ^b ^c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ ^a ^b Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5

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[1] "Tellurium tetraiodide". pubchem.ncbi.nlm.nih.gov. Retrieved 13 December 2021.

[Greenwood-2] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[Wiberg-3] Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5

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[2]

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