This kind of reaction is also observed with solutions of chrome alum and other water-soluble chromium(III) salts. If anhydrous violet chromium(III) chloride is dissolved in water, the violet solution turns green after some time as the chloride in the inner coordination sphere is replaced by water. Closely related compounds are the pale green Cl 2 and violet Cl 3. Commercially available chromium(III) chloride hydrate is the dark green complex Cl. (radius 50 pm), and they can replace each other in some compounds, such as in chrome alum and alum.Ĭhromium(III) tends to form octahedral complexes. Ion has a similar radius (63 pm) to Al 3+ Chromium(III) can be obtained by dissolving elemental chromium in acids like hydrochloric acid or sulfuric acid, but it can also be formed through the reduction of chromium(VI) by cytochrome c7. Chromium(III) Anhydrous chromium(III) chloride (CrCl 3)Ī large number of chromium(III) compounds are known, such as chromium(III) nitrate, chromium(III) acetate, and chromium(III) oxide. The red chromium(II) acetate (Cr 2(O 2CCH 3) 4) is somewhat famous. Many chromium(II) carboxylates are known. ![]() Some other notable chromium(II) compounds include chromium(II) oxide CrO, and chromium(II) sulfate CrSOĤ. The resulting bright blue solution created from dissolving chromium(II) chloride is stable at neutral pH. ![]() Water-stable chromium(II) chloride CrClĢ that can be made by reducing chromium(III) chloride with zinc. Bis(benzene)chromium and chromium hexacarbonyl are highlights in organochromium chemistry.Ĭhromium(II) Chromium(II) carbide (Cr 3C 2)Ĭhromium(II) compounds are uncommon, in part because they readily oxidize to chromium(III) derivatives in air. The +3 and +6 states occur most commonly within chromium compounds, followed by +2 charges of +1, +4 and +5 for chromium are rare, but do nevertheless occasionally exist. See also: Category:Chromium compounds The Pourbaix diagram for chromium in pure water, perchloric acid, or sodium hydroxide Ĭhromium is a member of group 6, of the transition metals.
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