Chromium (II) chloride
Crystal structure | ||||||||||||||||
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__ Cr 2+ __ Cl - | ||||||||||||||||
General | ||||||||||||||||
Surname | Chromium (II) chloride | |||||||||||||||
Ratio formula | CrCl 2 | |||||||||||||||
Brief description |
moisture-sensitive, air-sensitive, hygroscopic, gray odorless solid |
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External identifiers / databases | ||||||||||||||||
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properties | ||||||||||||||||
Molar mass | 122.90 g mol −1 | |||||||||||||||
Physical state |
firmly |
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density |
2.88 g cm −3 |
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Melting point |
823-825 ° C |
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solubility |
soluble in water |
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safety instructions | ||||||||||||||||
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Toxicological data | ||||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Chromium (II) chloride is a chemical compound from the group of chromium compounds and chlorides .
Extraction and presentation
Chromium (II) chloride is obtained by reducing chromium (III) chloride with hydrogen at 500 ° C:
To a lesser extent, lithium aluminum hydride LiAlH 4 or the like can also be used for the reduction
Reduction by zinc is also possible.
properties
Chromium (II) chloride is a moisture-sensitive, air-sensitive, hygroscopic , gray, odorless solid. It has an orthorhombic crystal structure (distorted rutile type, space group Pnnm (space group no. 58) ) similar to that of calcium chloride with a = 664, b = 598 and c = 348 pm .
use
Chromium (II) chloride is used as a catalyst , reducing agent and absorbent for oxygen . It is also used in the Nozaki-Hiyama-Kishi reaction .
Individual evidence
- ↑ a b c d e f g h i Entry on chromium (II) chloride in the GESTIS substance database of the IFA , accessed on January 8, 2018(JavaScript required) .
- ^ Burg, AB: Anhydrous Chromium (II) Chloride . In: Inorganic Syntheses . 3, 1950, pp. 150-153. doi : 10.1002 / 9780470132340 .
- ↑ JW Tracy, NW Gregory et al. a .: The crystal structure of chromium (II) chloride. In: Acta Crystallographica. 14, p. 927, doi : 10.1107 / S0365110X61002710 .