Chromium(II) iodide
Chromium(II) iodide is an inorganic chemical compound with the formula CrI2. It is a brown solid that is sensitive to air and moisture. Chromium(II) iodide consists of chromium in the +2 oxidation state bonded to two iodide ions.
Properties:
Chromium(II) iodide is a strong reducing agent. It is soluble in water under anaerobic conditions, forming solutions of chromium(II) ions. However, in the presence of oxygen, the chromium(II) ions are readily oxidized to chromium(III) ions. It decomposes in air and is hygroscopic.
Synthesis:
Chromium(II) iodide can be synthesized by reacting chromium metal with iodine at elevated temperatures in the absence of air and moisture. Another method involves the reaction of chromium(III) iodide with chromium metal.
Uses:
Chromium(II) iodide is primarily used in research. It is a precursor to other chromium(II) compounds and has applications in organometallic chemistry.
Hazards:
Chromium(II) iodide is a corrosive and potentially toxic substance. It should be handled with care, using appropriate personal protective equipment, such as gloves and eye protection. Contact with skin and eyes should be avoided. Inhalation of dust should also be prevented. It should be stored in a tightly sealed container under an inert atmosphere to prevent degradation.