Английская Википедия:Chromium(III) iodide
Шаблон:Chembox Chromium(III) iodide, also known as chromium triiodide, is an inorganic compound with the formula Шаблон:Chem2. It is a black solid that is used to prepare other chromium iodides.[1]
Like the isomorphous chromium(III) chloride (Шаблон:Chem2), chromium(III) iodide exhibits a cubic-closest packing arrangement in a double-layer crystal lattice. In this structure, chromium exhibits octahedral coordination geometry.[2]
Preparation and properties
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.[1]
Chromium triiodide is stable in contact with oxygen and moisture, but at temperatures approaching 200 °C it reacts with oxygen and releases iodine. Like Шаблон:Chem2, 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.[1]
Chromium triiodide can also be prepared as nanoplateletsШаблон:Cln from the alkoxide Шаблон:Chem2.[3]Шаблон: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.[4]
References
Шаблон:Chromium compounds Шаблон:Iodides Шаблон:Authority control
Шаблон:Inorganic-compound-stub
