Scandium iodide
Crystal structure | ||||||||||||||||
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__ Sc 3+ __ I - | ||||||||||||||||
General | ||||||||||||||||
Surname | Scandium iodide | |||||||||||||||
other names |
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Ratio formula | ScI 3 | |||||||||||||||
Brief description |
yellow solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 425.67 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
4.65 g cm −3 |
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Melting point |
920 ° C |
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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 . |
Scandium iodide is an inorganic chemical compound of scandium from the group of iodides .
Extraction and presentation
Scandium iodide can be obtained directly by reacting scandium with iodine .
properties
Scandium iodide is a moisture-sensitive yellow solid. It has a trigonal crystal system similar to that of bismuth triiodide with the space group R 3 (space group no. 148) .
use
Scandium iodide is used as an additive for special mercury vapor lamps that reproduce the spectrum of sunlight well. The connection is only created in the lamps. About 5 mg of scandium are added per lamp. In automobile lighting (mercury-free Xe lamps) scandium iodide has been used since at least 1994 in order to be able to implement the EU directive 2000/53 / EC in the long term. It can also be used as a mild Lewis acid in organic synthesis.
Individual evidence
- ^ A b c Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists . Springer DE, 1997, ISBN 3-540-60035-3 , pp. 718 ( limited preview in Google Book search).
- ↑ a b c d data sheet Scandium (III) iodide, anhydrous, powder, 99.999% trace metals basis from Sigma-Aldrich , accessed on November 4, 2012 ( PDF ).
- ↑ Web elements: Scandium | chemical reaction data .
- ^ Catherine E. Housecroft, AG Sharpe: Inorganic Chemistry . Pearson Education, 2005, ISBN 0-13-039913-2 , pp. 598 ( limited preview in Google Book search).
- ^ François Cardarelli: Materials Handbook: A Concise Desktop Reference . Springer, 2008, ISBN 1-84628-668-9 , pp. 434 ( limited preview in Google Book search).
- ↑ CK Gupta, N. Krishnamurthy: Extractive Metallurgy of Rare Earths . CRC Press, 2004, ISBN 0-415-33340-7 , pp. 48 ( limited preview in Google Book search).
- ↑ Per Enghag: Encyclopedia of the Elements: Technical Data - History - Processing - Applications . John Wiley & Sons, 2008, ISBN 3-527-61234-3 , pp. 477 ( limited preview in Google Book search).
- ↑ John A. Joule, Keith Mills: Heterocyclic Chemistry . John Wiley & Sons, 2010, ISBN 0-470-68597-2 , pp. 380 ( limited preview in Google Book search).