Tellurium tetraiodide
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| Tellurium tetraiodide | |
|---|---|
| Other names | tellurium(IV) iodide |
| Identifiers | |
| CAS number | [7790-48-9] |
| Properties | |
| Molecular formula | TeI4 |
| Molar mass | 635.22 g/mol |
| Appearance | black crystals |
| Density | 5.05 g/cm³, solid |
| Melting point |
280°C |
| Structure | |
| Crystal structure | orthorhombic |
| Hazards | |
| EU classification | not listed |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and 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 + 2CH3CN → (CH3CN)2TeI3+ + I−
[edit] References
- ^ a b c Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
- ^ a b Inorganic Chemistry,Egon Wiberg, Arnold Frederick Holleman Elsevier 2001 ISBN 0123526515
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