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Chromium iodide is the inorganic compound with the formula CrI2. It is a black solid. The compound is made by thermal decomposition of chromium iodide. Like many metal diiodides, CrI2 adopts the "cadmium iodide structure" motif, i.e., it features sheets of octahedral Cr centers interconnected by bridging iodiide ligands. Reflecting the effects of its d confiiguration, chromium's coordination sphere is highly distorted.
Treatment of chromium powder with concentrated hydroiodic acid gives a blue hydrated chromium iodide, which can be converted to related acetonitrile complexes.
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