Chromium (III) iodide
| Crystal structure | |||||||||||||||||||
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-chlorid.png)
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| __ Cr 3+ __ I - | |||||||||||||||||||
| General | |||||||||||||||||||
| Surname | Chromium (III) iodide | ||||||||||||||||||
| other names |
Chromium triiodide |
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| Ratio formula | CrI 3 | ||||||||||||||||||
| Brief description |
black solid |
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| properties | |||||||||||||||||||
| Molar mass | 432.71 g mol −1 | ||||||||||||||||||
| Physical state |
firmly |
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| density |
4.9 g cm −3 |
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| Melting point |
500 ° C (decomposition) |
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| safety instructions | |||||||||||||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||||||||
Chromium (III) iodide is a chemical compound from the group of iodides .
Extraction and presentation
Chromium (III) iodide can be obtained by reacting chromium with iodine .
properties
Chromium (III) iodide is a dark green solid that is quite resistant to air and moisture. It has a trigonal crystal system with the space group P 3 1 21 (space group no. 152) . At a temperature above 500 ° C the compound decomposes, producing chromium (II) iodide and iodine . With hexaquachrome (III) iodide [Cr (H 2 O) 6 ] I 3 · 3H 2 O there is also a hydrate of the compound, which forms dark-violet hygroscopic crystals.
use
Chromium (III) iodide can be used to produce high-purity chromium.
Individual evidence
- ↑ a b c N. W. Gregory and Lyman L. Handy: Chromium (III) iodide . In: Therald Moeller (Ed.): Inorganic Syntheses . tape 5 . McGraw-Hill, Inc., 1957, pp. 128-130 (English).
- ^ A b Jean D'Ans, Ellen Lax: Paperback for chemists and physicists . Springer DE, 1997, ISBN 3-540-60035-3 , pp. 398 ( limited preview in Google Book search).
- ↑ a b Chromium triiodide. In: webelements.com. Retrieved June 19, 2017 (English).
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ^ Mary Eagleson: Concise Encyclopedia Chemistry . Walter de Gruyter, 1994, ISBN 3-11-011451-8 , p. 222 ( limited preview in Google Book search).