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Chemical compound From Wikipedia, the free encyclopedia
Chromium(III) iodide, also known as chromium triiodide, is an inorganic compound with the formula CrI3. It is a black solid that is used to prepare other chromium iodides.[2]
Names | |
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IUPAC name
Chromium(III) iodide | |
Other names
Chromium triiodide, chromic iodide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.033.614 |
EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
CrI3 | |
Molar mass | 432.7095 g·mol−1 |
Appearance | black solid |
Density | 5.32 g/cm3[1] |
Melting point | > 600 °C (1,112 °F; 873 K) |
Soluble | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Like the isomorphous chromium(III) chloride (CrCl3), chromium(III) iodide exhibits a cubic-closest packing arrangement in a double-layer crystal lattice. In this structure, chromium exhibits octahedral coordination geometry.[3]
Chromium triiodide is prepared by the direct reaction of chromium metal with an excess of iodine. The reaction is conducted at 500 °C:
To obtain high purity samples, the product is thermally decomposed at 700 °C to sublime out chromium(II) iodide. The diiodide is then reiodinated.[2]
Chromium triiodide is stable in contact with oxygen and moisture, but at temperatures approaching 200 °C it reacts with oxygen and releases iodine. Like CrCl3, the triiodide exhibits slow solubility in water owing to the kinetic inertness of Cr(III). Addition of small amounts of chromous iodide accelerates the dissolving process.[2]
Chromium triiodide can also be prepared as nanoplatelets[clarification needed] from the alkoxide Cr(OC(CH3)(C(CH3)3)2)3.[4][how?]
Chromium triiodide was one of the first materials which was discovered to be a magnetic two-dimensional material that has great potentials for spintronics devices.[5]
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