We do not know which is the copper complex involved in the reaction as we did not add an external ligand. As a referee suggest a dimeric copper complex (Cu(O2)Cu) could be involved in the oxygen radical chemistry. Elwell CE, Gagnon NL, Neisen BD, Dhar D, Spaeth AD, Yee GM, Tolman WB.
Chem. Rev. 2017;
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