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. 2009 Mar 12;106(13):4969–4974. doi: 10.1073/pnas.0900995106

Scheme 1.

Scheme 1.

Schematic representation of Cu dx2-y2 and SCys p-orbital ground states of blue copper (plastocyanin, π ground state), resulting in the high-energy weak σ and low-energy strong π CT transitions (A) and normal and green copper (NiR, σ ground state), resulting in the high-energy strong σ and low-energy weak π CT transitions (B).