Tellurium tetraiodide
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| Tellurium tetraiodide | ||
|---|---|---|
| Other names tellurium(IV) iodide | ||
| Identifiers | ||
| CAS number | 7790-48-9 | |
| PubChem | 82255 | |
| EC number | 232-210-5 | |
| Jmol-3D images | {{#if:[Te](I)(I)(I)I|Image 1 | |
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| Properties | ||
| Molecular 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 | not listed | |
 (verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| 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
- ↑ 1.0 1.1 1.2 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.
- ↑ 2.0 2.1 Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0-12-352651-5
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