Valence tautomerism involving coupled Cu+/2+ and quinone−\./2− redox systems has been observed for the first time outside an enzymatic situation (amine oxidases) with chelates L as CuI and CuII affine coligands. Even slight variations of the quinone substitution pattern suffice to shift the valence tautomer equilibrium completely. [(L)CuII(Q−II)] ⇌ [(L)CuI(Q−I)]
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Rall et al. (1999) studied this question.