Tellurium tetraiodide
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]
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| Other names
tellurium(IV) iodide | |
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| ECHA InfoCard | 100.029.282  |
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| 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 | |
EU classification (DSD) (outdated) |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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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
- Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5
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