Cr2+ reacts with molecular oxygen with a rate constant of (1·6 ± 0·2)× 108l mol–1 s–1 to give a complex, CrO22+, with λmax 245 and 290 nm, ε= 7800 and 3200 l mol–1 cm–1, and which is long lived when [Cr2+]![[double less-than, compressed]](https://www.rsc.org/images/entities/char_2aa1.gif)
[O2].
R. M. Sellers and M. G. Simic, J. Chem. Soc., Chem. Commun., 1975, 401 DOI: 10.1039/C39750000401
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