Each Cr(II) ion has 4 d electrons but the complex is found to be diamagnetic which is explained by the formation of a quadruple bond between the two metal ions. 2H 2O is an example of a Cr(II) complex which is reasonably stable in air once isolated. See the laboratory manual for this course for a range of other Cr(III) complexes for which you should know the structure. This allows a small amount of the Cr(II) ion to be formed, which is very labile but unstable with respect to oxidation back to Cr(III).
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